Control method of projector, projector and program

Abstract

To prevent a user from feeling discomfort during executing a process to adjust brightness.SOLUTION: A control method of a projector 100 comprises: performing tiling projection toward a first area AR1 and a second area AR2 by projecting image light onto the first area AR1 by a first projector 100A and a first projector group GA and by projecting image light onto the second area AR2 by a second projector group GB; projecting image light by performing first adjustment processing PR11 that applies a second adjustment amount AD2 which is smaller than a first adjustment amount AD1 to the first projector group GA when projection of the first projector 100A is stopped and first processing PR1 is selected; and projecting image light by performing second adjustment processing PR12 that applies a third adjustment amount AD3 which is less than or equal to a difference between the first adjustment amount AD1 and the second adjustment amount AD2 to the first projector group GA after the first adjustment processing PR11.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a method for controlling a projector, a projector, and a program. [Background technology]

[0002] Conventionally, techniques relating to stack projection and tiling projection using a plurality of projectors are known (see, for example, Patent Document 1). Patent Document 1 discloses the following technology. That is, in a projection system composed of a plurality of projector groups, there are a first projector group that stacks and displays a first composite image in a first region of a display surface, and a second projector group that stacks and displays a second composite image in a second region of the display surface. A part of the first region overlaps a part of the second region, and tiling projection is performed by the first projector group and the second projector group. The brightness of the first projector group and the brightness of the second projector group are respectively adjusted so that the brightness of the first region and the brightness of the second region approach each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-71609 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 describes that when stack projection and tiling projection are performed, the overall brightness including both a first area projected by multiple units and a second area projected by a different number of units is controlled to be close to each other. If one of the projectors is unable to project due to a malfunction or the like, it is necessary to execute a process to adjust the brightness. However, the user may be aware of the change in luminance of the projection surface that occurs during the process of adjusting the brightness, which may cause discomfort. [Means for solving the problem]

[0005] One aspect of the present disclosure is a projection system including: a first projector and a first projector group including one or more projectors project image light onto a first region of a projection surface; and a second projector group including two or more projectors project image light onto a second region of the projection surface, thereby performing tiling projection onto the first region and the second region; when the projection of the first projector stops, selecting either a first process of adjusting the brightness of the light source of the first projector group multiple times in a first period based on at least one of an amount of change in luminance of an input image and a brightness around the projection surface, or a second process of adjusting the brightness of the light source of the first projector group once in a second period shorter than the first period; a first adjustment amount for adjusting an output of a light source of the first group of projectors so that a brightness of the first area projected onto the first area matches a brightness of the second area projected onto the image light of the second group of projectors; when the first process is selected, performing a first adjustment process of applying a second adjustment amount smaller than the first adjustment amount to the first group of projectors; projecting the image light by the first group of projectors after the first adjustment process; projecting the image light by the first group of projectors after the first group of projectors projects the image light, performing a second adjustment process of applying a third adjustment amount to the first group of projectors that is equal to or smaller than a difference between the first adjustment amount and the second adjustment amount; and projecting the image light by the first group of projectors after performing the second adjustment process.

[0006] Another aspect of the present disclosure is a projection system including: a first projector and a first projector group including one or more projectors projecting image light onto a first region of a projection surface; and a second projector group including two or more projectors projecting image light onto a second region of the projection surface, thereby performing tiling projection onto the first region and the second region; when the projection of the first projector stops, selecting either a first process of adjusting the brightness of the light source of the first projector group multiple times in a first period based on at least one of an amount of change in luminance of an input image and a brightness around the projection surface, or a second process of adjusting the brightness of the light source of the first projector group once in a second period shorter than the first period; The program causes a processor of a projector to execute the following: determining a first adjustment amount for adjusting an output of a light source of the first projector group so that a brightness of the first region matches a brightness of the second region onto which the image light of the second projector group is projected; when the first process is selected, performing a first adjustment process of applying a second adjustment amount smaller than the first adjustment amount to the first projector group; projecting the image light by the first projector group after performing the first adjustment process; performing a second adjustment process of applying a third adjustment amount, which is equal to or smaller than a difference between the first adjustment amount and the second adjustment amount, to the first projector group after the first projector group projects the image light; and projecting the image light by the first projector group after performing the second adjustment process.

[0007] Yet another aspect of the present disclosure is a projector including a light source, a memory, and at least one processor, wherein the at least one processor performs tiling projection onto the first region and the second region by having a first projector and a first projector group including one or more projectors project image light onto a first region of a projection surface, and a second projector group including two or more projectors project image light onto a second region of the projection surface, and selects, when projection by the first projector stops, either a first process of adjusting the brightness of the light source of the first projector group multiple times in a first period based on at least one of an amount of change in luminance of an input image and a brightness of a periphery of the projection surface, or a second process of adjusting the brightness of the light source of the first projector group once in a second period shorter than the first period, and the first adjustment process is performed when the first process is selected; a first adjustment process is performed to apply a second adjustment amount smaller than the first adjustment amount to the first projector group; after performing the first adjustment process, the first projector group projects the image light; after performing the first adjustment process, the first projector group projects the image light; a second adjustment process is performed to apply a third adjustment amount, which is equal to or smaller than a difference between the first adjustment amount and the second adjustment amount, to the first projector group after the first projector group projects the image light; and after performing the second adjustment process, the first projector group projects the image light, wherein the projector is a projector included in either the first projector group or the second projector group. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of an image projection system according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a diagram showing an example of the configuration of a projector according to an embodiment. [Diagram 3]FIG. 13 is a diagram showing an example of the configuration of a first control unit of a fourth projector. [Figure 4] 6 is a graph showing an example of a first process and a second process. [Diagram 5] 6 is a graph showing another example of the first process and the second process. [Figure 6] 10 is a flowchart showing an example of processing by a first control unit of a fourth projector. [Figure 7] 11 is a flowchart showing an example of a selection process. [Figure 8] 10 is a flowchart showing another example of the selection process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the present embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing an example of the configuration of an image projection system 1 according to the present embodiment. The image projection system 1 includes a projector 100 and an image supply device 200. The projector 100 includes a first projector 100A, a second projector 100B, a third projector 100C, and a fourth projector 100D. The second projector 100B corresponds to an example of a “first projector group.” In the following description, the second projector 100B may be referred to as a first projector group GA for convenience. The third projector 100C and the fourth projector 100D correspond to an example of a “second projector group.” In the following description, the third projector 100C and the fourth projector 100D may be referred to as a second projector group GB.

[0010] The first projector 100A to the fourth projector 100D are connected to each other so that they can communicate with each other. The first projector 100A to the fourth projector 100D are connected to each other so that they can communicate with each other, for example, via an Ethernet (registered trademark) cable. In this embodiment, the first projector 100A to the fourth projector 100D are connected to each other so as to be able to communicate by wired means such as an Ethernet (registered trademark) cable, but may also be connected to each other so as to be able to communicate by wireless means such as Wi-Fi (registered trademark).

[0011] Image supply device 200 is configured by, for example, a personal computer, and supplies images to each of first projector 100A to fourth projector 100D. Image supply device 200 supplies images generated by, for example, playing content to each of first projector 100A to fourth projector 100D via an Ethernet (registered trademark) cable.

[0012] In this embodiment, the image supply device 200 is connected to the first projector 100A to the fourth projector 100D so as to be able to communicate by wired means such as an Ethernet (registered trademark) cable, but may be connected so as to be able to communicate wirelessly such as by Wi-Fi (registered trademark). In this embodiment, the image supply device 200 is configured as a personal computer, but the image supply device 200 may be configured as a tablet terminal, a smartphone, or the like.

[0013] The first projector 100A to the fourth projector 100D are arranged, for example, in the left-right direction in Fig. 1. In other words, the first projector 100A to the fourth projector 100D are arranged along a direction parallel to the screen SC.

[0014] The first projector 100A projects the first image light PLA onto the first area AR1 of the screen SC. The second projector 100B projects the second image light PLB onto the first area AR1 of the screen SC. The third projector 100C projects the third image light PLC onto the second area AR2 of the screen SC. The fourth projector 100D projects the fourth image light PLD onto the second area AR2 of the screen SC.

[0015] Further, the first projector 100A and the second projector 100B project the first image light PLA and the second image light PLB to form a first image PM1 on the screen SC. The third projector 100C and the fourth projector 100D project the third image light PLC and the fourth image light PLD to form a second image PM2 on the screen SC. As shown in FIG. 1, the first image PM1 and the second image PM2 are arranged in the left-right direction. The first image PM1 and the second image PM2 form one projected image P. The screen SC corresponds to an example of a "projection surface."

[0016] The third region AR3 is a region where the first region AR1 and the second region AR2 overlap, and where the first image PM1 and the second image PM2 overlap. The first image light PLA to the fourth image light PLD projected onto the third region AR3 are subjected to a so-called edge blending process, so that the first image PM1 and the second image PM2 are smoothly connected. In the following description, when there is no need to distinguish between the first image light PLA to the fourth image light PLD, they may be referred to as image light PL.

[0017] In this embodiment, the first projector 100A and the second projector 100B display the first image PM1 in a so-called stacking manner, and the third projector 100C and the fourth projector 100D display the second image PM2 in a so-called stacking manner. In addition, the first projector 100A to the fourth projector 100D display the first image PM1 and the second image PM2 in a so-called tiling manner. The stacking display is, for example, a method in which the same image is projected by a plurality of projectors in a superimposed manner, thereby displaying a single image brighter than when displayed by a single projector. The tiling display is, for example, a method in which images are projected by a plurality of projectors in a line, thereby displaying a larger image than when displayed by a single projector.

[0018] In this embodiment, for example, the fourth projector 100D functions as a primary projector, and the first projector 100A to the third projector 100C function as secondary projectors. The fourth projector 100D controls the operation of each of the first projector 100A to the third projector 100C. Specifically, as will be described with reference to FIG. 3, the fourth projector 100D controls the output of the light source 111A of each of the first projector 100A to the third projector 100C. Light source 111A is further described with reference to FIG.

[0019] FIG. 2 is a diagram showing an example of the configuration of a projector 100 according to the present embodiment. Since the first projector 100A to the fourth projector 100D have substantially the same configuration, the configuration of the first projector 100A will be described with reference to Fig. 2, and a description of the configurations of the second projector 100B to the fourth projector 100D will be omitted. In the following description, when there is no need to distinguish between the first projector 100A to the fourth projector 100D, they may be referred to as projector 100.

[0020] 2, the first projector 100A includes a projection unit 110 and a drive unit 120 that drives the projection unit 110. The projection unit 110 forms an optical image and projects a first image light PLA onto the screen SC. In this embodiment, the projection unit 110 projects the first image light PLA corresponding to image data from the image supply device 200 onto the screen SC. The projection unit 110 includes a light source unit 111, a light modulation device 112, and a projection optical system 113. The drive unit 120 includes a light source drive unit 121 and a light modulation device drive unit 122.

[0021] The light source unit 111 includes a solid-state light source 111A such as an LED (Light Emitting Diode) or a laser light source. The solid-state light source 111A corresponds to an example of a "light source." In this embodiment, the light source unit 111 includes the solid-state light source 111A, but is not limited to this. The light source unit 111 may include a lamp light source such as a halogen lamp, a xenon lamp, or an extra-high pressure mercury lamp instead of the solid-state light source 111A. In the following description, the solid-state light source 111A may be referred to as light source 111A.

[0022] The light source unit 111 may also include a reflector and an auxiliary reflector that guide the light emitted by the light source 111A to the light modulation device 112. Furthermore, the light source unit 111 may also include a lens group for improving the optical characteristics of the projected light, a polarizing plate, or a light control element for reducing the amount of light emitted by the light source 111A on the path leading to the light modulation device 112. The light source driving unit 121 is connected to the internal bus 107, and controls the output of the light source 111A by turning on and off the light source 111A of the light source unit 111 according to instructions from a first control unit 150 also connected to the internal bus 107. In this embodiment, the light source driving unit 121 controls the output of the light source 111A according to instructions from a first processing unit 155 and a second processing unit 156 of the fourth projector 100D which will be described with reference to FIG.

[0023] The light modulation device 112 includes, for example, three liquid crystal panels 115 corresponding to the three primary colors of R, G, and B. R indicates red, G indicates green, and B indicates blue. That is, the light modulation device 112 includes a liquid crystal panel 115 corresponding to R light, a liquid crystal panel 115 corresponding to G light, and a liquid crystal panel 115 corresponding to B light. The light emitted by the light source unit 111 is separated into three color lights of RGB, and each color light is incident on a corresponding liquid crystal panel 115. Each of the three liquid crystal panels 115 is a transmissive liquid crystal panel, and generates a first image light PLA by modulating the light passing through the liquid crystal panel 115. The first image light PLA modulated after passing through each liquid crystal panel 115 is synthesized by a synthesis optical system such as a cross dichroic prism, and is output to the projection optical system 113. In this embodiment, the light modulation device 112 is described as having a transmissive liquid crystal panel 115 as a light modulation element, but is not limited to this. The light modulation element may be a reflective liquid crystal panel or a digital micromirror device.

[0024] The light modulation device 112 is driven by a light modulation device driving section 122. The light modulation device driving section 122 is connected to an image processing section 145. Image data corresponding to each of the primary colors R, G, and B is input to the light modulation device driving unit 122 from the image processing unit 145. The light modulation device driving unit 122 converts the input image data into a data signal suitable for the operation of the liquid crystal panel 115. The light modulation device driving unit 122 applies a voltage to each pixel of each liquid crystal panel 115 based on the converted data signal, and draws an image on each liquid crystal panel 115.

[0025] The projection optical system 113 includes a projection lens, a mirror, etc., which form an image of the incident image light PLA on the screen SC. The projection optical system 113 also includes a zoom mechanism which enlarges or reduces the image projected onto the screen SC, a focus adjustment mechanism which adjusts the focus, and a lens shift mechanism which adjusts the projection direction of the image light PLA.

[0026] The first projector 100A also includes an illuminance sensor 170. The illuminance sensor 170 detects the brightness of the surroundings of the first projector 100A. The illuminance sensor 170 is disposed, for example, on the side of the housing of the first projector 100A opposite to the side where the image light PLA is projected. In this case, the illuminance sensor 170 can suppress the influence of the image light PLA on the illuminance to be detected. The illuminance sensor 170 transmits a signal indicating the detected first illuminance BRA to the first control unit 150. The first control unit 150 transmits the first illuminance BRA detected by the illuminance sensor 170 to the fourth projector 100D via the first communication interface 141.

[0027] The first projector 100A further includes an operation unit 131, a remote control receiver 133, an input interface 135, a storage unit 137, a first communication interface 141, a frame memory 143, an image processing unit 145, and a first control unit 150. The input interface 135, the storage unit 137, the first communication interface 141, the image processing unit 145, the first control unit 150, and the illuminance sensor 170 are connected to each other via an internal bus 107 so as to be able to communicate data with each other.

[0028] The operation unit 131 includes various buttons and switches provided on the surface of the housing of the first projector 100A, generates operation signals corresponding to operations of these buttons and switches, and outputs the operation signals to the input interface 135. The input interface 135 includes a circuit that outputs the operation signals input from the operation unit 131 to the first control unit 150.

[0029] The remote control light receiving unit 133 receives an infrared signal transmitted from the remote control 5, and decodes the received infrared signal to generate an operation signal. The remote control light receiving unit 133 outputs the generated operation signal to the input interface 135. The input interface 135 includes a circuit that outputs the operation signal input from the remote control light receiving unit 133 to the first control unit 150.

[0030] The storage unit 137 is, for example, a magnetic recording device such as a hard disk drive (HDD), or a storage device using a semiconductor storage element such as a flash memory or a solid state drive (SSD). The storage unit 137 stores the program executed by the first control unit 150, the data processed by the first control unit 150, image data, and the like.

[0031] The first communication interface 141 is a communication interface that executes communication with the image supply device 200 and the second projector 100B to the fourth projector 100D according to the Ethernet (registered trademark) standard. The first communication interface 141 includes a connector for connecting an Ethernet (registered trademark) cable and an interface circuit for processing a signal transmitted through the connector. The first communication interface 141 is an interface board having a connector and an interface circuit, and is connected to a main board on which the first processor 150A and the like of the first control unit 150 are mounted. Alternatively, the connector and the interface circuit constituting the first communication interface 141 are mounted on the main board of the first control unit 150. The first communication interface 141 receives image data and the like from the image supply device 200. In addition, the first communication interface 141 transmits the first illuminance BRA detected by the illuminance sensor 170 to the fourth projector 100D, and receives instruction information for the output of the light source 111A from the fourth projector 100D.

[0032] The first control unit 150 includes a first memory 150B and a first processor 150A. The first memory 150B is a storage device that non-volatilely stores programs and data executed by the first processor 150A. The first memory 150B is configured by a semiconductor storage element such as a magnetic storage device or a flash ROM (Read Only Memory), or other types of non-volatile storage devices. The first memory 150B may also include a RAM (Random Access Memory) that configures a work area for the first processor 150A. The first memory 150B stores data processed by the first control unit 150, the first control program PGM1 executed by the first processor 150A, and the like.

[0033] The first processor 150A may be configured as a single processor, or may be configured such that a plurality of processors function as the first processor 150A. The first processor 150A executes the first control program PGM1 to control each part of the first projector 100A. For example, the first processor 150A outputs to the image processing unit 145 an instruction to execute image processing corresponding to an operation accepted by the operation unit 131 and the remote control 5, and parameters used in this image processing. The parameters include, for example, geometric correction parameters for correcting geometric distortion of an image projected on the screen SC. The first processor 150A also controls the light source driving unit 121 to control the turning on and off of the light source unit 111, and adjusts the output of the light source unit 111, i.e., the amount of light. The first processor 150A corresponds to an example of "at least one processor." The first memory 150B corresponds to an example of a "memory." The first control program PGM1 corresponds to an example of a "program".

[0034] The first processor 150A may be configured as a SoC (System on Chip) integrated with a part or all of the first memory 150B and other circuits. The first processor 150A may also be configured as a combination of a CPU (Central Processing Unit) that executes a program and a DSP (Digital Signal Processor) that executes a predetermined arithmetic process. All of the functions of the first processor 150A may be implemented in hardware, or may be configured using a programmable device.

[0035] The image processing unit 145 and the frame memory 143 can be configured, for example, by an integrated circuit. The integrated circuit includes a large-scale integration (LSI), an application specific integrated circuit (ASIC), and a programmable logic device (PLD). The PLD includes, for example, a field-programmable gate array (FPGA). Furthermore, an analog circuit may be included as part of the configuration of the integrated circuit, or a combination of a processor and an integrated circuit may be used. The combination of a processor and an integrated circuit is called a microcontroller (MCU), a system-on-a-chip (SoC), a system LSI, a chipset, or the like.

[0036] The image processing unit 145 expands the image data input from the first communication interface 141 into the frame memory 143. The frame memory 143 includes a plurality of banks. Each bank has a storage capacity capable of writing one frame's worth of image data. The frame memory 143 is configured, for example, by a Synchronous Dynamic Random Access Memory (SDRAM).

[0037] The image processing unit 145 performs image processing on the image data expanded in the frame memory 143, such as resolution conversion processing, resizing processing, distortion correction, shape correction processing, digital zoom processing, and adjustment of the color tone and brightness of the image. In addition, the image processing unit 145 generates a vertical synchronization signal by converting the input frame frequency of the vertical synchronization signal into a drawing frequency. The generated vertical synchronization signal is called an output synchronization signal. The image processing unit 145 outputs the generated output synchronization signal to the light modulation device driving unit 122.

[0038] Next, the configuration of the first control unit 150 of the fourth projector 100D will be described with reference to Fig. 3. Fig. 3 is a diagram showing an example of the configuration of the first control unit 150 of the fourth projector 100D. The first control unit 150 of the fourth projector 100D instructs the output of the light source 111A of the first projector 100A to the third projector 100C, and controls the operation of the fourth projector 100D. 3, the first control unit 150 includes a projection instruction unit 151, a stop detection unit 152, a selection unit 153, a determination unit 154, a first processing unit 155, a second processing unit 156, and an image storage unit 157. Specifically, the first processor 150A of the first control unit 150 executes a first control program PGM1 stored in a first memory 150B to function as the projection instruction unit 151, the stop detection unit 152, the selection unit 153, the determination unit 154, the first processing unit 155, and the second processing unit 156. In addition, the first processor 150A of the first control unit 150 executes the first control program PGM1 stored in the first memory 150B to cause the first memory 150B to function as the image storage unit 157.

[0039] The image storage unit 157 stores the first image PM1 from the second frame FR2 to the first frame FR1. The first frame FR1 is a frame of the first image PM1 input to the first projector 100A when the stop detection unit 152 detects that the projection of the first projector 100A has stopped. The second frame FR2 is a frame of the first image PM1 that is a predetermined number N of frames before the first frame FR1. The predetermined number N is, for example, 10. The first image PM1 from the second frame FR2 to the first frame FR1 is stored in the image storage unit 157 by the stop detection unit 152.

[0040] The projection instruction unit 151 causes the first projector 100A to project a first image light PLA corresponding to the first image PM1 onto a first area AR1 of the screen SC. The projection instruction unit 151 also causes the second projector 100B to project a second image light PLB corresponding to the first image PM1 onto the first area AR1 of the screen SC. The projection instruction unit 151 also causes the third projector 100C to project a third image light PLC corresponding to the second image PM2 onto a second area AR2 of the screen SC. In addition, the projection instruction unit 151 causes the liquid crystal panel 115 of the fourth projector 100D to display the second image PM2, and causes the projection unit 110 of the fourth projector 100D to project the fourth image light PLD corresponding to the second image PM2 onto the second area AR2 of the screen SC. That is, the projection instruction unit 151 causes the first projector 100A and the second projector 100B to project the first image PM1 onto the first area AR1 of the screen SC. Also, the third projector 100C and the fourth projector 100D to project the second image PM2 onto the second area AR2 of the screen SC. In this way, the first projector 100A to the fourth projector 100D perform tile projection of the first image PM1 and the second image PM2 onto the first area AR1 and the second area AR2.

[0041] The stop detection unit 152 detects that the projection of the first projector 100A has stopped. When the projection of the first projector 100A has stopped, for example, the first control unit 150 of the first projector 100A transmits stop information indicating that the projection of the first projector 100A has stopped to the fourth projector 100D. The stop detection unit 152 detects that the projection of the first projector 100A has stopped by receiving the stop information from the first projector 100A.

[0042] Furthermore, when the stop detection section 152 detects that the projection of the first projector 100A has stopped, it causes the image storage section 157 to store the first image PM1 from the second frame FR2 to the first frame FR1. For example, the stop detection unit 152 stores a predetermined number N of frames of the first image PM1 in the image storage unit 157. Furthermore, every time a frame of the first image PM1 to be projected by the first projector 100A is updated, the stop detection unit 152 updates the oldest frame of the predetermined number N of frames of the first image PM1 stored in the image storage unit 157 to the newest frame. Furthermore, when the stop detection unit 152 detects that the projection of the first projector 100A has stopped, the stop detection unit 152 stops the above-mentioned update process. The projection has stopped when, for example, the projection light is not being projected due to an abnormality in the projection unit 110, the drive unit 120, the first control unit 150, or the like. The projection has stopped when, for example, the light source unit 111 has stopped emitting light due to a malfunction or the like.

[0043] When the stop detection unit 152 detects that the projection of the first projector 100A has stopped, the selection unit 153 selects either the first process PR1 or the second process PR2 based on the amount of change in luminance ΔBR of the first image PM1, which is the input image. The first process PR1 is a process for gradually adjusting the brightness of the first projector group GA, i.e., the light source 111A of the second projector 100B, multiple times, two or more times, during the first period PE1. The second process PR2 is a process for gradually adjusting the brightness of the first projector group GA, i.e., the light source 111A of the second projector 100B, once during the second period PE2, which is shorter than the first period PE1. The first period PE1 is, for example, 200 msec, and the second period PE2 is, for example, 50 msec.

[0044] The brightness change amount ΔBR is the difference between the average pixel value V1 of the first frame FR1 of the first image PM1, which is the input image, and the average pixel value V2 of the second frame FR2 preceding the first frame FR1. The first frame FR1 is a frame of the first image PM1 that is input to the second projector 100B when the stop detection unit 152 detects that the projection of the first projector 100A has stopped. The second frame FR2 is a frame that is a predetermined number N of frames prior to the first frame FR1. The predetermined number N is, for example, 10. When the brightness change amount ΔBR is less than the first threshold TH1, the selection unit 153 selects the first process PR1. When the brightness change amount ΔBR is equal to or greater than the first threshold TH1, the selection unit 153 selects the second process PR2. The first threshold TH1 is, for example, 20% of the maximum brightness change amount ΔBR. The maximum brightness change amount ΔBR is the brightness change amount ΔBR when the second frame FR2 is a solid black image and the first frame FR1 is a solid white image.

[0045] The determination unit 154 determines a first adjustment amount AD1 for adjusting the output of the light source 111A of the first projector group GA, i.e., the second projector 100B, so that the brightness of the first region AR1 matches the brightness of the second region AR2. The brightness of the first region AR1 indicates the brightness of the first region AR1 onto which the image light of the first projector group GA is projected. The brightness of the second region AR2 indicates the brightness of the second region AR2 onto which the image light of the second projector group G2, i.e., the third projector 100C and the fourth projector 100D is projected.

[0046] Furthermore, the determination unit 154 executes the following process when, for example, the brightness of the first area AR1 cannot be made to match the brightness of the second area AR2 by simply adjusting the output of the light source 111A of the first projector group GA. That is, the determination unit 154 determines a fourth adjustment amount AD4 that adjusts the output of the light source 111A of the second projector group G2 so as to satisfy the following condition: Condition: The brightness of the second area AR2 when the fourth adjustment amount AD4 is applied to the second projector group GB to project image light matches the brightness of the first area AR1 when the first adjustment amount AD1 is applied to the first projector group GA to project image light.

[0047] When the selection unit 153 selects the first process PR1, the first processing unit 155 performs a first adjustment process PR11 and a second adjustment process PR12 as the first process PR1, and projects image light. The first adjustment process PR11 is a process of applying a second adjustment amount AD2 smaller than the first adjustment amount AD1 to the first projector group GA. The second adjustment process PR12 is a process of applying a third adjustment amount AD3, which is equal to or smaller than the difference between the first adjustment amount AD1 and the second adjustment amount AD2, to the first projector group GA after the first adjustment process PR11. In this embodiment, a case will be described in which the third adjustment amount AD3 is equal to the difference between the first adjustment amount AD1 and the second adjustment amount AD2. In other words, a case will be described in which the first processing unit 155 adjusts the brightness of the light source 111A of the first projector group GA in two stages in the first period PE1 as the first processing PR1.

[0048] For example, the first processing unit 155 applies the second adjustment amount AD2 to the first projector group GA at a first point in time T1 in the first period PE1 to project the image light. Also, the first processing unit 155 applies the third adjustment amount AD3 to the first projector group GA at a second point in time T2 after the first point in time T1 in the first period PE1 to project the image light. The first process PR1 in this case will be further described with reference to FIG.

[0049] The first processing unit 155 executes the following processing when, for example, the brightness of the first region AR1 cannot be made equal to the brightness of the second region AR2 by simply adjusting the output of the light source 111A of the first projector group GA. That is, the first processing unit 155 applies a fifth adjustment amount AD5 smaller than the fourth adjustment amount AD4 to the second projector group GB as the first adjustment processing PR11, and projects the image light. Also, the first processing unit 155 applies a sixth adjustment amount AD6, which is equal to or smaller than the difference between the fourth adjustment amount AD4 and the fifth adjustment amount AD5, to the second projector group G2 as the second adjustment processing PR12, and projects the image light. In this embodiment, a case will be described in which the sixth adjustment amount AD6 is equal to the difference between the fourth adjustment amount AD4 and the fifth adjustment amount AD5. In other words, a case will be described in which the first processing unit 155 adjusts the brightness of the light source 111A of the second projector group GB in two stages in the first period PE1 as the first processing PR1.

[0050] For example, at a first point in time T1 in the first period PE1, the first processing unit 155 applies the second adjustment amount AD2 to the first projector group GA to project the image light, and applies the fifth adjustment amount AD5 to the second projector group GB to project the image light. Also, at a second point in time T2 after the first point in time T1 in the first period PE1, the first processing unit 155 applies the third adjustment amount AD3 to the first projector group GA to project the image light, and applies the sixth adjustment amount AD6 to the second projector group GB to project the image light. The first process PR1 in this case will be further described with reference to FIG.

[0051] When the selection unit 153 selects the second process PR2, the second processing unit 156 applies the first adjustment amount AD1 to the first projector group GA to project the image light. For example, the second processing unit 156 applies the first adjustment amount AD1 to the first projector group GA in a second period PE2 that is shorter than the first period PE1, and projects the image light. The second process PR2 in this case will be further described with reference to FIG.

[0052] The second processing unit 156 executes the following processing, for example, when the brightness of the first area AR1 cannot be made to match the brightness of the second area AR2 by simply adjusting the output of the light source 111A of the first projector group GA. The first processing unit 155 applies the first adjustment amount AD1 to the first projector group GA to project the image light, and applies the fourth adjustment amount AD4 to the second projector group GB to project the image light. The second process PR2 in this case will be further described with reference to FIG.

[0053] Next, with reference to FIG. 4, a case in which the first processing unit 155 and the second processing unit 156 adjust only the first projector group GA will be described. Fig. 4 is a graph showing an example of the first process PR1 and the second process PR2. In Fig. 4, the horizontal axis represents time T, and the vertical axis represents the brightness EA of the first area AR1. A case will be described where the output of the light source 111A of each of the first projector 100A to the fourth projector 100D is 50% before the projection of the first projector 100A stops. In this case, the brightness of the first area AR1 and the second area AR2 is, for example, 100%. Note that the brightness EA of the first area AR1 is described as the sum of the output of the light source 111A of the first projector 100A and the output of the light source 111A of the second projector 100B. Also, the brightness of the second area AR2 is described as the sum of the output of the light source 111A of the third projector 100C and the output of the light source 111A of the fourth projector 100D.

[0054] 4, at time TA, the projection of the first projector 100A stops. As a result, as shown in the graph GC, the brightness EA of the first area AR1 decreases from the second brightness ET12 to the first brightness ET11. The second brightness ET12 is 100%, and the first brightness ET11 is 50%.

[0055] The determination unit 154 determines the first adjustment amount AD1 to be an increase of 50%. First, the case where the selection unit 153 selects the first process PR1 will be described. As shown in graph G11, the first processing unit 155 applies the second adjustment amount AD2 to the first projector group GA at a first point in time T1 in the first period PE1 to project image light. The first period PE1 is a period from point in time TA to point in time TE1. The first period PE1 is, for example, 300 msec. The first point in time T1 indicates, for example, 50 msec after point in time TA. The second adjustment amount AD2 is, for example, an increase of 30%. That is, the first processing unit 155 adjusts the output of the light source 111A of the second projector 100B from 50% to 80% at the first point in time T1.

[0056] Next, as shown in graph G11, the first processing unit 155 applies the third adjustment amount AD3 to the first projector group GA at a second point in time T2 in the first period PE1 to project image light. The second point in time T2 indicates, for example, 200 msec after the point in time TA. The third adjustment amount AD3 is, for example, an increase of 20%. Note that the third adjustment amount AD3 is the difference between the first adjustment amount AD1 and the second adjustment amount AD2. That is, the first processing unit 155 adjusts the output of the light source 111A of the second projector 100B from 80% to 100% at the second point in time T2. As a result, the brightness EA of the first area AR1 becomes the second brightness ET12 by being adjusted stepwise multiple times. That is, the brightness EA of the first area AR1 matches the brightness of the second area AR2.

[0057] Next, a case where the selection unit 153 selects the second process PR2 will be described. As shown in graph G12, the second processing unit 156 applies the first adjustment amount AD1 to the first projector group GA at the first point in time T1 in the second period PE2 to project the image light. The first adjustment amount AD1 is an increase of 50%. That is, the second processing unit 156 adjusts the output of the light source 111A of the second projector 100B from 50% to 100% in one go at the first point in time T1. As a result, the brightness EA of the first area AR1 becomes the second brightness ET12. That is, the brightness EA of the first area AR1 matches the brightness of the second area AR2.

[0058] As described with reference to Fig. 4, in the second process PR2, the output of the light source 111A of the first projector group GA is adjusted once in the second period PE2. In contrast to this, in the first process PR1, the output of the light source 111A of the first projector group GA is adjusted stepwise in the first period PE1 that is longer than the second period PE2. Therefore, by performing the first process PR1, it is possible to reduce the possibility that the user will feel uncomfortable during the process of adjusting the brightness, compared to the case of performing the second process PR2.

[0059] 4, a case where the output of the light source 111A of the first projector group GA is adjusted in two stages in the first process PR1 is described, but is not limited to this. In the first process PR1, the output of the light source 111A of the first projector group GA may be adjusted in three or more stages. Moreover, it is preferable to increase the number of stages for adjusting the output of the light source 111A of the first projector group GA as the brightness change amount ΔBR decreases. In this case, it is possible to reduce the possibility that the user will feel uncomfortable while the brightness adjustment process is being performed.

[0060] Next, with reference to FIG. 5, a case where the first processing unit 155 and the second processing unit 156 adjust the first projector group GA and the second projector group GB will be described. Fig. 5 is a graph showing another example of the first process PR1 and the second process PR2. In Fig. 5, the horizontal axis represents time T, and the vertical axis represents the brightness EA of the first area AR1 and the brightness EB of the second area AR2. A case will be described where the output of the light source 111A of each of the first projector 100A to the fourth projector 100D is 70% before the projection of the first projector 100A stops. In this case, the brightness of the first area AR1 and the second area AR2 is, for example, 140%. Note that the brightness EA of the first area AR1 is described as the sum of the output of the light source 111A of the first projector 100A and the output of the light source 111A of the second projector 100B. Also, the brightness EB of the second area AR2 is described as the sum of the output of the light source 111A of the third projector 100C and the output of the light source 111A of the fourth projector 100D.

[0061] 5, at time TA, the projection of the first projector 100A stops. As a result, as shown in the graph GC, the brightness EA of the first area AR1 decreases from the second brightness ET12 to the first brightness ET11. The second brightness ET12 is 140%, and the first brightness ET11 is 70%.

[0062] The determination unit 154 determines the first adjustment amount AD1 to be an increase of 30%. First, the case where the selection unit 153 selects the first process PR1 will be described. As shown in graph G21, the first processing unit 155 applies the second adjustment amount AD2 to the first projector group GA at a first point in time T1 in the first period PE1 to project image light. The first period PE1 is a period from point in time TA to point in time TE1. The first period PE1 is, for example, 300 msec. The first point in time T1 indicates, for example, 50 msec after point in time TA. The second adjustment amount AD2 is, for example, an increase of 20%. That is, the first processing unit 155 adjusts the output of the light source 111A of the second projector 100B from 70% to 90% at the first point in time T1. Moreover, as shown in graph G31, the first processing unit 155 applies the fifth adjustment amount AD5 to the second projector group GB at the first point in time T1 in the first period PE1 to project the image light. The fifth adjustment amount AD5 is, for example, a reduction of 10%. That is, the first processing unit 155 adjusts the output of the light source 111A of the third projector 100C and the fourth projector 100D from 70% to 60% at the first point in time T1. As a result, the brightness EB of the second area AR2 is reduced to the first brightness ET21, that is, from 140% to 120%.

[0063] Next, as shown in graph G21, the first processing unit 155 applies the third adjustment amount AD3 to the first projector group GA at a second point in time T2 in the first period PE1 to project image light. The second point in time T2 indicates, for example, 200 msec after the point in time TA. The third adjustment amount AD3 is, for example, an increase of 10%. Note that the third adjustment amount AD3 is the difference between the first adjustment amount AD1 and the second adjustment amount AD2. That is, the first processing unit 155 adjusts the output of the light source 111A of the second projector 100B from 90% to the third brightness ET13, that is, 100%, at the second point in time T2. Furthermore, as shown in graph G31, the first processing unit 155 applies the sixth adjustment amount AD6 to the second projector group GB at the first point in time T1 in the first period PE1 to project the image light. The sixth adjustment amount AD6 is, for example, a reduction of 10%. That is, the first processing unit 155 adjusts the output of the light source 111A of the third projector 100C and the fourth projector 100D from 60% to 50% at the first point in time T1. As a result, the brightness EB of the second area AR2 is reduced from 120% to the second brightness ET22, that is, 100%. As a result, the brightness EA of the first area AR1 coincides with the brightness EB of the second area AR2.

[0064] Next, a case where the selection unit 153 selects the second process PR2 will be described. As shown in graph G22, the second processing unit 156 applies the first adjustment amount AD1 to the first projector group GA at the first point in time T1 in the second period PE2 to project the image light. The first adjustment amount AD1 is an increase of 30%. That is, the second processing unit 156 adjusts the output of the light source 111A of the second projector 100B from 70% to 100% at the first point in time T1. Furthermore, as shown in graph G32, the second processing unit 156 applies the fourth adjustment amount AD4 to the second projector group GB at the first point in time T1 in the second period PE2 to project the image light. The fourth adjustment amount AD4 is a reduction of 40%. That is, the second processing unit 156 adjusts the output of the light source 111A of the second projector group GB from 140% to 100% at the first point in time T1. As a result, the brightness EA of the first area AR1 coincides with the brightness EB of the second area AR2.

[0065] 5, in the second process PR2, the output of the light source 111A of the first projector group GA and the second projector group GB is adjusted stepwise in the second period PE2. In contrast to this, in the first process PR1, the output of the light source 111A of the first projector group GA and the second projector group GB is adjusted stepwise in the first period PE1 that is longer than the second period PE2. Therefore, by performing the first process PR1, it is possible to reduce the possibility that the user will feel uncomfortable during the process of adjusting the brightness, compared to the case where the second process PR2 is performed.

[0066] 5, a case will be described in which the output of the light source 111A of the first projector group GA and the second projector group GB is adjusted in two stages, i.e., twice, in the first process PR1, but the present invention is not limited to this. In the first process PR1, the output of the light source 111A of the first projector group GA and the second projector group GB may be adjusted in three stages, i.e., three or more times. Furthermore, it is preferable to increase the number of stages, i.e., the number of times, for adjusting the output of the light source 111A of the first projector group GA and the second projector group GB as the brightness change amount ΔBR becomes smaller. In this case, it is possible to reduce the possibility that the user will feel uncomfortable while the brightness adjustment process is being performed.

[0067] Next, the processing of the first control unit 150 of the fourth projector 100D will be described with reference to Fig. 6 to Fig. 8. Note that Fig. 6 to Fig. 8 will describe a case where the determination unit 154 determines the first adjustment amount AD1 and the fourth adjustment amount AD4. In other words, a case where the output of the light source 111A of the first projector group GA and the output of the light source 111A of the second projector group GB are adjusted will be described. FIG. 6 is a flowchart showing an example of the process of the first control unit 150 of the fourth projector 100D. As shown in FIG. 6, first, in step S101, the projection instruction unit 151 causes the first projector 100A and the second projector 100B to project image light corresponding to the first image PM1 onto the first area AR1 of the screen SC. Next, in step S103, the projection instruction unit 151 causes the third projector 100C and the fourth projector 100D to project the image light corresponding to the second image PM2 onto the second area AR2 of the screen SC.

[0068] Next, in step S105, the stop detection unit 152 determines whether or not the projection of the first projector 100A has stopped. When the stop detection unit 152 determines that the projection of the first projector 100A has not stopped (step S105; NO), the process returns to step S101. When the stop detection unit 152 determines that the projection of the first projector 100A has stopped (step S105; YES), the process proceeds to step S107. Then, in step S107, the determination unit 154 determines the first adjustment amount AD1. Next, in step S109, the determination unit 154 determines the fourth adjustment amount AD4. Note that, in steps S107 and S109, the determination unit 154 determines the first adjustment amount AD1 and the fourth adjustment amount AD4 so as to satisfy the following conditions. Condition: The brightness of the second area AR2 when the fourth adjustment amount AD4 is applied to the second projector group GB to project image light matches the brightness of the first area AR1 when the first adjustment amount AD1 is applied to the first projector group GA to project image light.

[0069] Next, in step S111, the selection unit 153 executes a selection process. The "selection process" is a process for selecting the first process PR1 or the second process PR2. The "selection process" will be described with reference to FIGS. 7 and 8. In step S113, the first control unit 150 determines whether the selection unit 153 has selected the first process PR1. When the first control unit 150 determines that the selection unit 153 has not selected the first process PR1 (step S113; NO), the process proceeds to step S115. Then, in step S115, the first control unit 150 determines that the selection unit 153 has selected the second process PR2. Next, in step S117, the second processing unit 156 applies the first adjustment amount AD1 to the first projector group GA at the first time point T1 to project the image light, and applies the fourth adjustment amount AD4 to the second projector group GB to project the image light. Then, the processing ends.

[0070] When the first control unit 150 determines that the selection unit 153 has selected the first process PR1 (step S113; YES), the process proceeds to step S119. Then, in step S119, the first processing unit 155 applies the second adjustment amount AD2 to the first projector group GA at the first point in time T1 to project image light, and applies the fifth adjustment amount AD5 to the second projector group GB to project image light. Next, in step S121, the first processing unit 155 applies the third adjustment amount AD3 to the first projector group GA at the second time point T2 to project the image light, and applies the sixth adjustment amount AD6 to the second projector group GB to project the image light. Then, the processing ends.

[0071] Next, a selection process in which the selection unit 153 selects the first process PR1 or the second process PR2 based on the luminance change amount ΔBR will be described with reference to Fig. 7. Note that in the following description, a case in which the image storage unit 157 stores the first image PM1 from the second frame FR2 to the first frame FR1 will be described. The first frame FR1 is a frame of the first image PM1 input to the first projector 100A when the projection of the first projector 100A is stopped. The second frame FR2 is a frame of the first image PM1 that is a predetermined number N of frames before the first frame FR1. The predetermined number N is, for example, 10. FIG. 7 is a flowchart showing an example of the selection process executed in step S111 of FIG. As shown in FIG. 7, first, in step S201, the selection unit 153 calculates an average pixel value V1 of the first frame FR1 of the first image PM1, which is an input image. Next, in step S203, the selection unit 153 calculates the average pixel value V2 of the second frame FR2 of the first image PM1, which is the input image.

[0072] Next, in step S205, the selection unit 153 determines whether the brightness change amount ΔBR is less than a first threshold value TH1. The brightness change amount ΔBR is the difference between the average pixel value V1 and the average pixel value V2. The first threshold value TH1 is, for example, 20% of the maximum value of the brightness change amount ΔBR. When the selection unit 153 determines that the luminance change amount ΔBR is less than the first threshold value TH1 (step S205; YES), the process proceeds to step S207. Then, in step S207, the selection unit 153 selects the first process PR1. After that, the process returns to step S113 in FIG. When the selection unit 153 determines that the luminance change amount ΔBR is not less than the first threshold value TH1 (step S205; NO), the process proceeds to step S209. Then, in step S209, the selection unit 153 selects the second process PR2. After that, the process returns to step S113 in FIG.

[0073] 7, the selection unit 153 selects the first process PR1 or the second process PR2 based on the luminance change amount ΔBR. Therefore, the first process PR1 and the second process PR2 can be appropriately selected. In this embodiment, the brightness change amount ΔBR is the difference between the average pixel value V1 of the first frame FR1 of the input image and the average pixel value V2 of the second frame FR2 preceding the first frame FR1, but is not limited to this. For example, the absolute value of the difference between the average pixel values ​​of adjacent frames from the second frame FR2 to the first frame FR1 may be calculated, and the average value may be calculated as the brightness change amount ΔBR. In this case, the first process PR1 and the second process PR2 can be appropriately selected.

[0074] Next, with reference to FIG. 8, a selection process in which the selection unit 153 selects the first process PR1 or the second process PR2 based on the brightness BRS of the periphery of the screen SC will be described. FIG. 8 is a flowchart showing another example of the selection process executed in step S111 of FIG. As shown in FIG. 8, first, in step S301, the selection unit 153 acquires the first illuminance BRA, the second illuminance BRB, the third illuminance BRC, and the fourth illuminance BRD when the projection of the first projector is stopped. The first illuminance BRA is the illuminance detected by the illuminance sensor 170 of the first projector 100A. The second illuminance BRB is the illuminance detected by the illuminance sensor 170 of the second projector 100B. The third illuminance BRC is the illuminance detected by the illuminance sensor 170 of the third projector 100C. The fourth illuminance BRD is the illuminance detected by the illuminance sensor 170 of the fourth projector 100D. Next, in step S303, the selection unit 153 calculates the average value of the first illuminance BRA to the fourth illuminance BRD as the brightness BRS of the periphery of the screen SC.

[0075] Next, in step S305, the selection unit 153 determines whether or not the brightness BRS of the periphery of the screen SC is less than a second threshold TH2. The second threshold TH2 is, for example, 30 lx. If it is determined that the brightness BRS of the periphery of the screen SC is less than the second threshold value TH2 (step S305; YES), the process proceeds to step S307. Then, in step S307, the selection unit 153 selects the first process PR1. After that, the process returns to step S113 in FIG. If it is determined that the brightness BRS of the periphery of the screen SC is not less than the second threshold value TH2 (step S305; NO), the process proceeds to step S309. Then, in step S309, the selection unit 153 selects the second process PR2. After that, the process returns to step S113 in FIG.

[0076] 8, the selection unit 153 selects the first process PR1 or the second process PR2 based on the brightness BRS of the periphery of the screen SC. Therefore, the first process PR1 and the second process PR2 can be appropriately selected. In the present embodiment, the selection unit 153 calculates the average value of the first illuminance BRA to the fourth illuminance BRD as the brightness BRS around the screen SC, but is not limited to this. The selection unit 153 may calculate the brightness BRS around the screen SC based on at least one of the first illuminance BRA to the fourth illuminance BRD. For example, the selection unit 153 may calculate the smallest illuminance among the first illuminance BRA to the fourth illuminance BRD as the brightness BRS around the screen SC.

[0077] [Present embodiment and effects] As described above with reference to FIGS. 1 to 8 , the control method of the projector 100 according to this embodiment includes: a first projector 100A and a first projector group GA including one or more projectors project image light onto a first area AR1 of the screen SC; and a second projector group GB including two or more projectors 100 project image light onto a second area AR2 of the screen SC, thereby performing tiling projection onto the first area AR1 and the second area AR2; and, when the projection of the first projector 100A is stopped, performing a first process PR1 of adjusting the brightness of the light source 111A of the first projector group GA multiple times in a first period PE1 based on at least one of the amount of luminance change ΔBR of the input image and the brightness BRS of the periphery of the screen SC; and a second process PR2 of adjusting the brightness of the light source 111A of the first projector group GA once in a second period PE2 that is shorter than the first period PE1. 2; determining a first adjustment amount AD1 that adjusts the output of the light source 111A of the first projector group GA so that the brightness of a first area AR1 onto which the image light of the first projector group GA is projected matches the brightness of a second area AR2 onto which the image light of the second projector group GB is projected; when the first process PR1 is selected, performing a first adjustment process PR11 that applies a second adjustment amount AD2 smaller than the first adjustment amount AD1 to the first projector group GA; projecting the image light by the first projector group GA after performing the first adjustment process PR11; projecting the image light by the first projector group GA; performing a second adjustment process PR12 that applies a third adjustment amount AD3 that is equal to or smaller than the difference between the first adjustment amount AD1 and the second adjustment amount AD2 to the first projector group GA after performing the second adjustment process PR12; and projecting the image light by the first projector group GA after performing the second adjustment process PR12.

[0078] That is, when the projection of the first projector 100A stops and the first process PR1 is selected, a first adjustment process PR11 is performed to apply a second adjustment amount AD2 smaller than the first adjustment amount AD1 to the first projector group GA, and after the first adjustment process PR11 is performed, the first projector group GA projects image light, and after the first projector group GA projects the image light, a second adjustment process PR12 is performed to apply a third adjustment amount AD3 that is less than or equal to the difference between the first adjustment amount AD1 and the second adjustment amount AD2 to the first projector group GA, and after the second adjustment process PR12 is performed, the first projector group GA projects the image light. That is, in the first process PR1, the brightness of the first projector group GA is adjusted multiple times in the first period PE1, compared to the case where the second process PR2 is executed in which the adjustment is performed once in the second period PE2 that is shorter than the first period PE1. Therefore, in the first process PR1, it is possible to prevent the user from feeling uncomfortable during the process of adjusting the brightness of the first projector group GA, compared to the case where the second process PR2 is executed. Therefore, it is possible to prevent the user from feeling uncomfortable during the process of adjusting the brightness of the first projector group GA when the projection of the first projector 100A stops.

[0079] The control method of projector 100 also includes, when a first process PR1 is selected, determining a fourth adjustment amount AD4 that adjusts the output of light source 111A of the second projector group GB, and the first process PR1 includes applying a fifth adjustment amount AD5 smaller than the fourth adjustment amount AD4 to the second projector group GB, and after applying the fifth adjustment amount AD5 to the second projector group GB, the second projector group GB projects image light, applying a sixth adjustment amount AD6 that is less than or equal to the difference between the fourth adjustment amount AD4 and the fifth adjustment amount AD5 to the second projector group GB, and after applying the sixth adjustment amount AD6 to the second projector group GB, the second projector group GB projects the image light. That is, in the first process PR1, the brightness of the second projector group GB is adjusted multiple times in the first period PE1, compared to the case where the second process PR2 is executed in which the adjustment is performed once in the second period PE2 that is shorter than the first period PE1. Therefore, in the first process PR1, it is possible to prevent the user from feeling uncomfortable during the process of adjusting the brightness of the second projector group GB, compared to the case where the second process PR2 is executed. Therefore, it is possible to prevent the user from feeling uncomfortable during the process of adjusting the brightness of the second projector group GB when the projection of the first projector 100A stops.

[0080] Furthermore, in the control method of projector 100, the first process PR1 includes, at a first point in time T1 of the first period PE1, applying a second adjustment amount AD2 to the first projector group GA, and after applying the second adjustment amount AD2 to the first projector group GA, the first projector group GA projects the image light; applying a fifth adjustment amount AD5 to the second projector group GB, and after applying the fifth adjustment amount AD5 to the second projector group GB, the second projector group GB projects the image light; at a second point in time T2 after the first point in time T1 of the first period PE1, applying a third adjustment amount AD3 to the first projector group GA, and after applying the third adjustment amount AD3 to the first projector group GA, the first projector group GA projects the image light; applying a sixth adjustment amount AD6 to the second projector group GB at the second point in time T2, and after applying the sixth adjustment amount AD6 to the second projector group GB, the second projector group GB projects the image light. Therefore, the brightness of the first projector group GA and the second projector group GB can be adjusted simultaneously at the first point in time T1 and the second point in time T2 of the first period PE1. Therefore, it is possible to prevent the user from feeling uncomfortable while the process of adjusting the brightness of the first projector group GA and the second projector group GB is being executed.

[0081] In addition, the control method of projector 100 includes, when the second process PR2 is selected, applying a first adjustment amount AD1 to the first projector group GA, and after applying the first adjustment amount AD1 to the first projector group GA, the first projector group GA projects image light. Therefore, when the second process PR2 is executed, the brightness of the first projector group GA can be adjusted in a short time and with a simple process compared to when the first process PR1 is executed.

[0082] The control method of projector 100 also includes determining a fourth adjustment amount AD4 that adjusts the output of light source 111A of the second projector group GB when the second process PR2 is selected, and the second process PR2 includes applying the first adjustment amount AD1 to the first projector group GA in a second period PE2, and after applying the first adjustment amount AD1 to the first projector group GA, the first projector group GA projects image light, and applying a fourth adjustment amount AD4 to the second projector group GB in the second period PE2, and after applying the fourth adjustment amount AD4 to the second projector group GB, the second projector group GB projects image light. Therefore, when the second process PR2 is executed, the brightness of the first projector group GA and the second projector group GB can be adjusted in a short time and with a simple process compared to when the first process PR1 is executed.

[0083] In addition, the control method of projector 100 includes determining a fourth adjustment amount AD4 such that the brightness of the second area AR2 when the second projector group GB projects image light after applying the fourth adjustment amount AD4 to the second projector group GB matches the brightness of the first area AR1 when the first projector group GA projects image light after applying the first adjustment amount AD1 to the first projector group GA. Therefore, the brightness of the second area AR2 can be made to coincide with the brightness of the first area AR1, and the fourth adjustment amount AD4 can be determined to an appropriate value.

[0084] In addition, the control method of the projector 100 includes selecting either the first process PR1 or the second process PR2 when a brightness change amount ΔBR, which is a difference between an average pixel value V1 of a first frame FR1 of an input image input to the first projector group GA and an average pixel value V2 of a second frame FR2 preceding the first frame FR1, when projection of the first projector 100A stops is less than a first threshold value TH1, and selecting the second process PR2 when the brightness change amount ΔBR is equal to or greater than the first threshold value TH1 when projection of the first projector 100A stops. Therefore, when the brightness change amount ΔBR is less than the first threshold value TH1, the first process PR1 is selected, and when the brightness change amount ΔBR is equal to or greater than the first threshold value TH1, the second process PR2 is selected. Therefore, by appropriately setting the first threshold value TH1, it is possible to appropriately select either the first process PR1 or the second process PR2.

[0085] In addition, the control method of projector 100 includes selecting either the first process PR1 or the second process PR2, when the brightness BRS of the surrounding area of ​​the screen SC when projection of the first projector 100A stops is less than a second threshold value TH2, selecting the first process PR1, and when the brightness BRS of the surrounding area of ​​the screen SC is equal to or greater than the second threshold value TH2. That is, when the brightness BRS of the periphery of the screen SC when the projection of the first projector 100A stops is less than the second threshold TH2, the first process PR1 is selected, and when the brightness BRS of the periphery of the screen SC is equal to or greater than the second threshold TH2, the second process PR2 is selected. Therefore, by appropriately setting the second threshold TH2, it is possible to appropriately select either the first process PR1 or the second process PR2.

[0086] A first control program PGM1 according to the present embodiment performs tiling projection onto the first area AR1 and the second area AR2 by having a first projector 100A and a first projector group GA including one or more projectors project image light onto a first area AR1 of the screen SC, and a second projector group GB including two or more projectors 100 project image light onto a second area AR2 of the screen SC; when the projection of the first projector 100A is stopped, selects either a first process PR1 in which the brightness of the light source 111A of the first projector group GA is adjusted multiple times in a first period PE1, or a second process PR2 in which the brightness of the light source 111A of the first projector group GA is adjusted once in a second period PE2 that is shorter than the first period PE1, based on at least one of an amount of change in brightness ΔBR of the input image and a brightness BRS of the periphery of the screen SC; The fourth processor 150A of the fourth projector 100D is caused to execute the following operations: determining a first adjustment amount AD1 that adjusts the output of the light source 111A of the first projector group GA so that the brightness of the first area AR1 onto which the image light of the group GA is projected matches the brightness of the second area AR2 onto which the image light of the second projector group GB is projected; when the first process PR1 is selected, performing a first adjustment process PR11 that applies a second adjustment amount AD2 smaller than the first adjustment amount AD1 to the first projector group GA; projecting the image light by the first projector group GA after performing the first adjustment process PR11; and performing a second adjustment process PR12 that applies a third adjustment amount AD3 that is equal to or smaller than the difference between the first adjustment amount AD1 and the second adjustment amount AD2 to the first projector group GA after the first projector group GA projects the image light; and projecting the image light by the first projector group GA after performing the second adjustment process PR12. Therefore, the first control program PGM1 according to the present embodiment can achieve the same effects as the control method for the projector 100 according to the present embodiment.

[0087] The fourth projector 100D according to the present embodiment includes a light source 111A, a first memory 150B, and a first processor 150A. The first processor 150A performs tiling projection onto the first area AR1 and the second area AR2 by having a first projector group GA including the first projector 100A and the second projector 100B project image light onto a first area AR1 of the screen SC, and a second projector group GB including the third projector 100C and the fourth projector 100D project image light onto a second area AR2 of the screen SC. When the projection of the first projector 100A stops, a first process PR1 adjusts the brightness of the light source 111A of the first projector group GA multiple times during a first period PE1 based on at least one of a luminance change amount ΔBR of the input image and a brightness BRS of the periphery of the screen SC, and a second process PR2 adjusts the brightness of the light source 111A of the first projector group GA once during a second period PE2 that is shorter than the first period PE1. and a second process PR2; determining a first adjustment amount AD1 that adjusts the output of the light source 111A of the first projector group GA so that the brightness of a first area AR1 onto which the image light of the first projector group GA is projected matches the brightness of a second area AR2 onto which the image light of the second projector group GB is projected; when the first process PR1 is selected, performing a first adjustment process PR11 that applies a second adjustment amount AD2 smaller than the first adjustment amount AD1 to the first projector group GA; after performing the first adjustment process PR11, the first projector group GA projects the image light; after performing the first adjustment process PR11, performing a second adjustment process PR12 that applies a third adjustment amount AD3 that is equal to or smaller than the difference between the first adjustment amount AD1 and the second adjustment amount AD2 to the first projector group GA after the first projector group GA projects the image light; and after performing the second adjustment process PR12, the first projector group GA projects the image light, and the fourth projector 100D is included in the second projector group GB. Therefore, the fourth projector 100D according to this embodiment can achieve the same effects as the control method of the projector 100 according to this embodiment.

[0088] [Other embodiments] The above-described embodiment is a preferred embodiment, however, the present invention is not limited to the above-described embodiment and various modifications are possible without departing from the scope of the present invention. In this embodiment, for convenience, a case where the first projector group GA is configured with one projector, that is, the second projector 100B, will be described with reference to Fig. 1 to Fig. 8, but is not limited to this. The first projector group GA may include two or more projectors. In addition, in this embodiment, a case where the second projector group GB is configured with two projectors, that is, the third projector 100C and the fourth projector 100D, will be described, but is not limited to this. The second projector group GB may include three or more projectors.

[0089] In this embodiment, the fourth projector 100D functions as the primary projector, but the present invention is not limited to this. Any one of the first projector 100A to the third projector 100C may function as the primary projector. In addition, in this embodiment, a case has been described in which the first control unit 150 of the fourth projector 100D includes a projection instruction unit 151, a stop detection unit 152, a selection unit 153, a determination unit 154, a first processing unit 155, a second processing unit 156, and an image memory unit 157, but this is not limited to this. For example, the first control unit 150 of any one of the first projector 100A to the third projector 100C may include a projection instruction unit 151, a stop detection unit 152, a selection unit 153, a determination unit 154, a first processing unit 155, a second processing unit 156, and an image storage unit 157. Also, for example, the second control unit of the image supply device 200 may include the projection instruction unit 151, the stop detection unit 152, the selection unit 153, the determination unit 154, the first processing unit 155, the second processing unit 156, and the image storage unit 157.

[0090] Moreover, each functional unit shown in FIG. 3 indicates a functional configuration, and the specific implementation form is not particularly limited. In other words, it is not necessarily necessary to implement hardware corresponding to each functional unit individually, and it is also possible to implement a configuration in which one processor executes a program to realize the functions of multiple functional units. Also, some of the functions realized by software in the above embodiment may be realized by hardware, or some of the functions realized by hardware may be realized by software. In addition, the specific detailed configuration of each unit of projector 100 can also be changed arbitrarily without departing from the spirit of the projector.

[0091] 6 to 8 are divided according to the main processing contents in order to facilitate understanding of the processing of first control unit 150 of fourth projector 100D. There is no limitation to the manner of division or names of the processing units shown in each of the flowcharts of FIG. 6 to 8, and the processing can be divided into more processing units according to the processing contents, or one processing unit can be divided to include more processes. Furthermore, the processing order of the above flowcharts is not limited to the example shown in the figures.

[0092] Furthermore, the control method of the projector 100 can be realized by having the first processor 150A included in the projector 100 execute a first control program PGM1 corresponding to the control method of the projector 100. Furthermore, the first control program PGM1 can also be recorded in a computer-readable recording medium. The recording medium may be a magnetic or optical recording medium or a semiconductor memory device. Specific examples include portable or fixed recording media such as a flexible disk, HDD, CD-ROM (Compact Disk Read Only Memory), DVD, Blu-ray (registered trademark) Disc, magneto-optical disk, flash memory, and card-type recording medium. The recording medium may also be a non-volatile storage device such as a RAM, ROM, or HDD, which is an internal storage device provided in the projector 100. The first control program PGM1 can be stored in a server device or the like, and the first control program PGM1 can be downloaded from the server device to the projector 100, thereby implementing the method for controlling the projector 100.

[0093] [Note] The following is a summary of this disclosure. (Appendix 1) a first projector and a first projector group including one or more projectors project image light onto a first region of a projection surface, and a second projector group including two or more projectors project image light onto a second region of the projection surface, thereby performing tiling projection onto the first region and the second region; when the projection of the first projector stops, selecting one of a first process of adjusting the brightness of the light source of the first projector group multiple times in a first period based on at least one of an amount of change in luminance of an input image and brightness around the projection surface, and a second process of adjusting the brightness of the light source of the first projector group once in a second period shorter than the first period; a first adjustment amount for adjusting an output of a light source of a first group of projectors so that a brightness of the first area matches a brightness of the second area onto which image light of the second group of projectors is projected; when the first process is selected, performing a first adjustment process of applying a second adjustment amount smaller than the first adjustment amount to the first group of projectors; projecting the image light by the first group of projectors after performing the first adjustment process; performing a second adjustment process of applying a third adjustment amount, which is equal to or smaller than a difference between the first adjustment amount and the second adjustment amount, to the first group of projectors after the first group of projectors projects the image light; and projecting the image light by the first group of projectors after performing the second adjustment process.

[0094] As a result, in the first process, the brightness of the first projector group is adjusted multiple times in the first period, compared to when the second process is executed in which the adjustment is performed once in the second period shorter than the first period. Therefore, in the first process, compared to when the second process is executed, it is possible to prevent the user from feeling uncomfortable during the process of adjusting the brightness. Therefore, when the projection of the first projector stops, it is possible to prevent the user from feeling uncomfortable during the process of adjusting the brightness of the first projector group.

[0095] (Appendix 2) and determining a fourth adjustment amount for adjusting an output of a light source of the second group of projectors when the first process is selected, the first process including: applying a fifth adjustment amount smaller than the fourth adjustment amount to the second group of projectors; projecting image light from the second group of projectors after applying the fifth adjustment amount to the second group of projectors; applying a sixth adjustment amount that is equal to or smaller than a difference between the fourth adjustment amount and the fifth adjustment amount to the second group of projectors; and projecting image light from the second group of projectors after applying the sixth adjustment amount to the second group of projectors.

[0096] As a result, in the first process, the brightness of the second projector group is adjusted multiple times in the first period, compared to when the second process is executed in which the adjustment is performed once in the second period shorter than the first period. Therefore, in the first process, it is possible to prevent the user from feeling uncomfortable during the process of adjusting the brightness, compared to when the second process is executed. Therefore, when the projection of the first projector stops, it is possible to prevent the user from feeling uncomfortable during the process of adjusting the brightness of the second projector group.

[0097] (Appendix 3) the first processing includes: applying the second adjustment amount to the first group of projectors at a first point in time in the first period, and the first group of projectors projecting image light after applying the second adjustment amount to the first group of projectors; applying the fifth adjustment amount to the second group of projectors at the first point in time, and the second group of projectors projecting image light after applying the fifth adjustment amount to the second group of projectors; applying the third adjustment amount to the first group of projectors at a second point in time later than the first point in time in the first period, and the first group of projectors projecting image light after applying the third adjustment amount to the first group of projectors; applying the sixth adjustment amount to the second group of projectors at the second point in time, and the second group of projectors projecting image light after applying the sixth adjustment amount to the second group of projectors.

[0098] This makes it possible to simultaneously adjust the brightness of the first projector group and the second projector group at the first point in time and the second point in time of the first period. Therefore, it is possible to prevent the user from feeling uncomfortable while the process of adjusting the brightness of the first projector group and the second projector group is being executed.

[0099] (Appendix 4) A projector control method according to any one of Appendix 1 to Appendix 3, comprising: when the second process is selected, applying the first adjustment amount to the first projector group; and after applying the first adjustment amount to the first projector group, the first projector group projects image light.

[0100] As a result, when the second process is executed, the brightness of the first projector group can be adjusted in a short time and with a simple process compared to when the first process is executed.

[0101] (Appendix 5) and determining a fourth adjustment amount for adjusting an output of a light source of the second group of projectors when the second process is selected, the second process including: applying the first adjustment amount to the first group of projectors in the second period, and the first group of projectors projecting image light after applying the first adjustment amount to the first group of projectors; applying the fourth adjustment amount to the second group of projectors in the second period, and the second group of projectors projecting image light after applying the fourth adjustment amount to the second group of projectors.

[0102] As a result, when the second process is executed, the brightness of the first projector group and the second projector group can be adjusted in a short time and with a simple process compared to when the first process is executed.

[0103] (Appendix 6) The projector control method described in Appendix 5, wherein determining the fourth adjustment amount includes determining the fourth adjustment amount so that the brightness of the second area when the second projector group projects image light after applying the fourth adjustment amount to the second projector group matches the brightness of the first area when the first projector group projects image light after applying the first adjustment amount to the first projector group.

[0104] This makes it possible to determine the fourth adjustment amount to be an appropriate value, that is, to make the brightness of the second region coincident with the brightness of the first region.

[0105] (Appendix 7) The projector control method of any one of Appendix 1 to Appendix 6, wherein selecting either the first process or the second process includes selecting the first process when a difference between an average pixel value of a first frame of an input image input to the first projector group when projection of the first projector stops and an average pixel value of a second frame preceding the first frame is less than a first threshold, and selecting the second process when a difference between an average pixel value of the first frame and an average pixel value of the second frame when projection of the first projector stops is equal to or greater than a first threshold.

[0106] This allows appropriate selection of either the first process or the second process.

[0107] (Appendix 8) The projector control method of any one of Appendix 1 to Appendix 6, wherein selecting either the first process or the second process includes selecting the first process when the brightness around the projection surface when the projection of the first projector stops is less than a second threshold, and selecting the second process when the brightness around the projection surface when the projection of the first projector stops is equal to or greater than a second threshold.

[0108] This allows appropriate selection of either the first process or the second process.

[0109] (Appendix 9) a first projector and a first projector group including one or more projectors projecting image light onto a first region of a projection surface, and a second projector group including two or more projectors projecting image light onto a second region of the projection surface, thereby performing tiling projection onto the first region and the second region; when the projection of the first projector is stopped, selecting one of a first process of adjusting the brightness of the light source of the first projector group multiple times in a first period based on at least one of an amount of change in luminance of an input image and a brightness around the projection surface, and a second process of adjusting the brightness of the light source of the first projector group once in a second period shorter than the first period; determining a first adjustment amount to adjust output of the light source of the first projector group so that brightness of the first region matches brightness of the second region onto which the image light of the second projector group is projected; when the first process is selected, performing a first adjustment process of applying a second adjustment amount smaller than the first adjustment amount to the first projector group; projecting the image light by the first projector group after performing the first adjustment process; performing a second adjustment process of applying a third adjustment amount, which is equal to or smaller than the difference between the first adjustment amount and the second adjustment amount, to the first projector group after the first projector group projects the image light; and projecting the image light by the first projector group after performing the second adjustment process.

[0110] As a result, the program described in Supplementary Note 9 has the same effect as the projector control method described in Supplementary Note 1.

[0111] (Appendix 10) A projector including a light source, a memory, and at least one processor, wherein the at least one processor performs tiling projection onto the first region and the second region by having a first projector and a first projector group including one or more projectors project image light onto a first region of a projection surface, and a second projector group including two or more projectors project image light onto a second region of the projection surface, and when the projection of the first projector stops, selects one of a first process of adjusting the brightness of the light source of the first projector group multiple times in a first period based on at least one of an amount of change in luminance of an input image and a brightness of a periphery of the projection surface, and a second process of adjusting the brightness of the light source of the first projector group once in a second period shorter than the first period, and a projector that executes the following steps: determining a first adjustment amount for adjusting an output of a light source of the first projector group so that the brightness of the first area onto which image light is projected matches the brightness of the second area onto which the image light of the second projector group is projected; when the first process is selected, performing a first adjustment process of applying a second adjustment amount smaller than the first adjustment amount to the first projector group; projecting the image light by the first projector group after performing the first adjustment process; performing a second adjustment process of applying a third adjustment amount to the first projector group, which is equal to or smaller than the difference between the first adjustment amount and the second adjustment amount, after the first projector group projects the image light; and projecting the image light by the first projector group after performing the second adjustment process, wherein the projector is included in either the first projector group or the second projector group.

[0112] As a result, the projector described in Supplementary Note 10 achieves the same effects as the projector control method described in Supplementary Note 1. [Explanation of symbols]

[0113] 1...image projection system, 100...projector, 100A...first projector, 100B...second projector (first projector group), 100C...third projector (part of second projector group), 100D...fourth projector (projector, part of second projector group), 111...light source unit, 111A...solid light source (light source), 115...liquid crystal panel, 141...first communication interface, 150...first control unit, 150A...first processor, 150B...first memory, 151...projection instruction unit, 152...stop detection unit, 153...selection unit, 154...determination unit, 155...first processing unit, 156...second processing unit, 157...image storage unit, 170...illuminance sensor, 200...image supply device, AD1...first adjustment amount, AD2...second 2 adjustment amount, AD3...third adjustment amount, AD4...fourth adjustment amount, AD5...fifth adjustment amount, AD6...sixth adjustment amount, AR1...first area, AR2...second area, AR3...third area, BRA...first illuminance, BRB...second illuminance, BRC...third illuminance, BRD...fourth illuminance, BRS...ambient brightness, FR1...first frame, FR2...second frame, GA...first projector group, GB...second projector group, PE1...first period, PE2...second period, PGM1...first control program (program), PR1...first process, PR11...first adjustment process, PR12...second adjustment process, PR2...second process, SC...screen (projection surface), T1...first point in time, T2...second point in time, TH1...first threshold, TH2...second threshold, V1, V2...average pixel value, ΔBR...amount of change in brightness.

Claims

1. a first projector and a first projector group including one or more projectors project image light onto a first region of a projection surface, and a second projector group including two or more projectors project image light onto a second region of the projection surface, thereby performing tiling projection onto the first region and the second region; When the projection of the first projector is stopped, selecting one of a first process of adjusting the brightness of the light source of the first projector group multiple times in a first period based on at least one of an amount of change in luminance of an input image and brightness around the projection surface, and a second process of adjusting the brightness of the light source of the first projector group once in a second period shorter than the first period; determining a first adjustment amount for adjusting an output of a light source of the first projector group so that a brightness of the first area onto which the image light of the first projector group is projected matches a brightness of the second area onto which the image light of the second projector group is projected; When the first process is selected, performing a first adjustment process of applying a second adjustment amount smaller than the first adjustment amount to the first projector group; After performing the first adjustment process, the first projector group projects image light; and performing a second adjustment process of applying a third adjustment amount, which is equal to or smaller than a difference between the first adjustment amount and the second adjustment amount, to the first projector group after the first projector group projects image light; After performing the second adjustment process, the first projector group projects image light; and A method for controlling a projector.

2. When the first process is selected, determining a fourth adjustment amount for adjusting the output of the light source of the second group of projectors; Including, The first process includes: applying a fifth adjustment amount that is smaller than the fourth adjustment amount to the second projector group; applying the fifth adjustment amount to the second projector group, and then causing the second projector group to project image light; applying a sixth adjustment amount to the second projector group, the sixth adjustment amount being equal to or smaller than a difference between the fourth adjustment amount and the fifth adjustment amount; applying the sixth adjustment amount to the second projector group, and then causing the second projector group to project image light; The method of controlling a projector according to claim 1 , comprising:

3. The first process includes: applying the second adjustment amount to the first group of projectors at a first time point in the first time period; applying the second adjustment amount to the first projector group, and then causing the first projector group to project image light; applying the fifth adjustment amount to the second group of projectors at the first point in time; applying the fifth adjustment amount to the second projector group, and then causing the second projector group to project image light; applying the third adjustment amount to the first group of projectors at a second point in time that is later than the first point in time during the first period; applying the third adjustment amount to the first projector group, and then causing the first projector group to project image light; applying the sixth adjustment amount to the second group of projectors at the second point in time; applying the sixth adjustment amount to the second projector group, and then causing the second projector group to project image light; The method for controlling a projector according to claim 2 .

4. When the second process is selected, applying the first adjustment amount to the first group of projectors; applying the first adjustment amount to the first projector group, and then causing the first projector group to project image light; The method of controlling a projector according to claim 1 , comprising:

5. When the second process is selected, determining a fourth adjustment amount for adjusting the output of the light source of the second group of projectors; Including, The second process includes: applying the first adjustment amount to the first projector group during the second period; applying the first adjustment amount to the first projector group, and then causing the first projector group to project image light; applying the fourth adjustment amount to the second projector group during the second period; applying the fourth adjustment amount to the second projector group, and then causing the second projector group to project image light; The method of controlling a projector according to claim 1 , comprising:

6. Determining the fourth adjustment amount includes: determining the fourth adjustment amount so that a brightness of the second area when the second projector group projects image light after applying the fourth adjustment amount to the second projector group matches a brightness of the first area when the first projector group projects image light after applying the first adjustment amount to the first projector group; The method for controlling a projector according to claim 5 .

7. Selecting one of the first process and the second process includes: selecting the first process when a difference between an average pixel value of a first frame of an input image input to the first projector group and an average pixel value of a second frame preceding the first frame when projection of the first projector is stopped is less than a first threshold value; selecting the second process when a difference between an average pixel value of the first frame and an average pixel value of the second frame when the projection of the first projector is stopped is equal to or greater than a first threshold value; The method for controlling a projector according to claim 1 , further comprising:

8. Selecting one of the first process and the second process includes: selecting the first process when the brightness around the projection surface when the projection of the first projector is stopped is less than a second threshold value; selecting the second process when the brightness around the projection surface when the projection of the first projector is stopped is equal to or greater than a second threshold value; The method for controlling a projector according to claim 1 , further comprising:

9. a first projector and a first projector group including one or more projectors project image light onto a first region of a projection surface, and a second projector group including two or more projectors project image light onto a second region of the projection surface, thereby performing tiling projection onto the first region and the second region; When the projection of the first projector is stopped, selecting one of a first process of adjusting the brightness of the light source of the first projector group multiple times in a first period based on at least one of an amount of change in luminance of an input image and brightness around the projection surface, and a second process of adjusting the brightness of the light source of the first projector group once in a second period shorter than the first period; determining a first adjustment amount for adjusting an output of a light source of the first projector group so that a brightness of the first area onto which the image light of the first projector group is projected matches a brightness of the second area onto which the image light of the second projector group is projected; When the first process is selected, performing a first adjustment process of applying a second adjustment amount smaller than the first adjustment amount to the first projector group; After performing the first adjustment process, the first projector group projects image light; and performing a second adjustment process of applying a third adjustment amount, which is equal to or smaller than a difference between the first adjustment amount and the second adjustment amount, to the first projector group after the first projector group projects image light; After performing a second adjustment process, the first projector group projects image light; and A program that causes the projector's processor to execute the above.

10. A projector, A light source; Memory and at least one processor; The at least one processor a first projector and a first projector group including one or more projectors project image light onto a first region of a projection surface, and a second projector group including two or more projectors project image light onto a second region of the projection surface, thereby performing tiling projection onto the first region and the second region; When the projection of the first projector is stopped, selecting one of a first process of adjusting the brightness of the light source of the first projector group multiple times in a first period based on at least one of an amount of change in luminance of an input image and brightness around the projection surface, and a second process of adjusting the brightness of the light source of the first projector group once in a second period shorter than the first period; determining a first adjustment amount for adjusting an output of a light source of the first projector group so that a brightness of the first area onto which the image light of the first projector group is projected matches a brightness of the second area onto which the image light of the second projector group is projected; When the first process is selected, performing a first adjustment process of applying a second adjustment amount smaller than the first adjustment amount to the first projector group; After performing the first adjustment process, the first projector group projects image light; and performing a second adjustment process of applying a third adjustment amount, which is equal to or smaller than a difference between the first adjustment amount and the second adjustment amount, to the first projector group after the first projector group projects image light; After performing the second adjustment process, the first projector group projects image light; and Run The projector is included in either a first projector group or a second projector group. projector.

Images