Image processing method for projector, image processing program, and image processing apparatus

Abstract

To appropriately correct luminance unevenness of a projection image even when a gradation value of the image is the maximum value.SOLUTION: An image processing method for a projector 100 includes: causing the projector 100 to project a pattern image PTN on a screen SC, project a first part PT1 of the pattern image PTN with first luminance LM1 onto a first area AR1 of the screen SC, and project a second part PT2 of the pattern image PTN with second luminance LM2 higher than the first luminance LM1 onto a second area AR2 of the screen SC; causing the projector 100 to focus on the first area AR1; decreasing the luminance of the second area AR2 to correct luminance unevenness of a projection image PM; and executing correction processing CP of correcting blur in the projection image PM on the pattern image PTN. The correction processing CP executes, on the second part PT2, correction processing having a higher correction intensity than the correction processing on the first part PT1.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to an image processing method, an image processing program, and an image processing device for a projector. [Background technology]

[0002] 2. Description of the Related Art Conventionally, techniques for suppressing blurring of an image projected by a projector have been known. For example, Patent Document 1 discloses a technique in which an image processing device applies various filter processes to an image to suppress the occurrence of blurring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-185817 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the filtering process described in Patent Document 1, when the gradation value of the image is at the maximum value, the gradation value of the image cannot be increased any further, and therefore there are cases where the filtering process is not effective. [Means for solving the problem]

[0005] One aspect of the present disclosure is an image processing method for a projector, comprising: causing a projector to project a projected image onto a projection surface including a first region and a second region different from the first region; projecting a first portion of the projected image onto the first region of the projection surface at a first brightness; and projecting a second portion of the projected image different from the first portion onto the second region of the projection surface at a second brightness higher than the first brightness; focusing the projector on the first region of the projection surface; correcting brightness unevenness of the projected image corresponding to the projected image on the projection surface by reducing the brightness of the second region of the projection surface; and applying a correction process to the projected image to correct blurring of the projected image, wherein the correction process applies a correction process to the second portion of the projected image with a stronger correction strength than the correction process applied to the first portion.

[0006] Another aspect of the present disclosure is an image processing program that causes a processor of an image processing device to function as a projection control unit that causes a projector to project a projected image onto a projection surface including a first region and a second region different from the first region, projecting a first portion of the projected image onto the first region of the projection surface at a first luminance and projecting a second portion of the projected image different from the first portion onto the second region of the projection surface at a second luminance higher than the first luminance; a focus control unit that focuses the projector on the first region of the projection surface; a first correction unit that corrects luminance unevenness of the projected image corresponding to the projected image on the projection surface by reducing the luminance of the second region of the projection surface; and a second correction unit that applies a correction process to the projected image to correct blurring of the projected image, and the second correction unit applies a correction process to the second portion of the projected image with a stronger correction than the correction process to the first portion.

[0007] Yet another aspect of the present disclosure is an image processing device comprising: a projection control unit that causes a projector to project a projected image onto a projection surface including a first region and a second region different from the first region, and projects a first portion of the projected image onto the first region of the projection surface at a first brightness and a second portion of the projected image different from the first portion onto the second region of the projection surface at a second brightness higher than the first brightness; a focus control unit that focuses the projector on the first region of the projection surface; a first correction unit that corrects brightness unevenness of a projected image corresponding to the projected image on the projection surface by reducing the brightness of the second region of the projection surface; and a second correction unit that applies a correction process to the projected image to correct blurring of the projected image, wherein the second correction unit applies a correction process to the second portion of the projected image with a stronger correction strength than the correction process to the first portion. [Brief explanation 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. [Figure 2] FIG. 2 is a diagram showing an example of the configuration of a first control unit of the projector. [Figure 3] FIG. 10 is a diagram showing an example of a state in which a short focus projector projects onto a concave surface. [Figure 4] FIG. 10 is a diagram showing an example of a state in which a short focus projector projects onto a convex surface. [Figure 5] FIG. 10 is a diagram showing an example of a state in which a long focus projector projects onto a concave surface. [Figure 6] FIG. 10 is a diagram showing another example of a state in which the long focus projector projects onto a concave surface. [Figure 7] FIG. 10 is a diagram showing an example of a state in which a long focus projector projects onto a convex surface. [Figure 8] FIG. 4 is an image diagram showing an example of processing by a first control unit. [Figure 9] FIG. 10 is an image diagram showing another example of the processing of the first control unit. [Figure 10] 10A and 10B are screen diagrams showing examples of user operations accepted by a second correction unit. [Figure 11]6 is a flowchart showing an example of processing by a first control unit. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, this 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 this embodiment. The image projection system 1 includes a projector 100 and an image supply device 200.

[0010] The image supply device 200 is configured by, for example, a personal computer or the like, and supplies a pattern image PTN to the projector 100. The image supply device 200 supplies the pattern image PTN to the projector 100 via, for example, a USB (registered trademark) (Universal Serial Bus) cable.

[0011] In this embodiment, the image supply device 200 is connected to the projector 100 via a USB (registered trademark) cable or the like to enable wired communication, but may also be connected via Wi-Fi (registered trademark) or the like to enable wireless communication. In this embodiment, the image supply device 200 is configured as a personal computer, but the image supply device 200 may also be configured as a tablet terminal, a smartphone, or the like.

[0012] The projectors 100 include a so-called short focus projector 100S and a so-called long focus projector 100L. The short focus projector 100S has a shorter focal length or a throw ratio of 1 or less compared to the long focus projector 100L. The throw ratio is the ratio of the projection distance to the width of the projected image. The focal length of the short focus projector 100S is less than or equal to a first threshold value TH1. The first threshold value TH1 is, for example, 2.1 m. The focal length of the short focus projector 100S is, for example, 0.5 m to 4 m. The long focus projector 100L has a longer focal length or a throw ratio of 5 or more compared to the short focus projector 100S. The focal length of the long focus projector 100L is equal to or greater than the second threshold value TH2. The second threshold value TH2 is, for example, 10.5 m. The focal length of the long focus projector 100L is, for example, 10 m to 40 m.

[0013] The projector 100 projects image light PL corresponding to the pattern image PTN onto the screen SC. The projector 100 also projects the image light PL so as to form a projection image PM on the screen SC. The screens SC include a concave screen SC1, a convex screen SC2, a concave screen SC3, a concave screen SC4, and a convex screen SC5. The image light PL includes a first image light PL1, a second image light PL2, a third image light PL3, a fourth image light PL4, and a fifth image light PL5. The projected images PM include a first projected image PM1, a second projected image PM2, a third projected image PM3, a fourth projected image PM4, and a fifth projected image PM5. The concave screens SC1 to SC5, the first to fifth image lights PL1 to PL5, and the first to fifth projected images PM1 to PM5 will be further described with reference to FIGS. The pattern image PTN corresponds to an example of a "projected image." The screen SC corresponds to an example of a "projection surface."

[0014] As shown in FIG. 1, the projector 100 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 image light PL onto a screen SC. In this embodiment, the projection unit 110 projects, for example, image light PL corresponding to a pattern image PTN onto the screen SC. In this embodiment, the pattern image PTN is, for example, a grid line image including black grid lines. 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.

[0015] 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 is described as including 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 ultra-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 the light source 111A.

[0016] 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 dimming element that reduces 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 turns on and off the light source 111A of the light source unit 111 in accordance with instructions from the first control unit 150 also connected to the internal bus 107, thereby controlling the output of the light source 111A.

[0017] 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 modulates the light that passes through it to generate image light PL. The image light PL that has passed through each liquid crystal panel 115 and been modulated is combined by a combining optical system such as a cross dichroic prism, and is emitted 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.

[0018] The light modulation device 112 is driven by a light modulation device driving unit 122. The light modulation device driving unit 122 is connected to the image processing unit 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. Based on the converted data signal, the light modulation device driving unit 122 applies a voltage to each pixel of each liquid crystal panel 115, and draws an image on each liquid crystal panel 115.

[0019] The projection optical system 113 includes a first projection lens 113A that focuses the incident image light PL on the screen SC, a mirror, etc. The projection optical system 113 also includes a zoom mechanism that enlarges or reduces the image projected onto the screen SC, a focus adjustment mechanism that adjusts the focus, and a lens shift mechanism that adjusts the projection direction of the image light PL.

[0020] The projector 100 also includes a first camera 160A. The first camera 160A captures the projected image PM and generates a captured image PP in accordance with instructions from the first control unit 150. The first camera 160A also transmits the generated captured image PP to the first control unit 150. The first camera 160A is disposed near the first projection lens 113A of the projector 100.

[0021] The projector 100 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 first camera 160A are connected to each other via an internal bus 107 so as to be able to communicate data with each other.

[0022] The operation unit 131 includes various buttons and switches provided on the surface of the housing of the projector 100, generates operation signals corresponding to the operation 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.

[0023] The remote control light receiving unit 133 receives an infrared signal transmitted from the remote control 5, decodes the received infrared signal, and generates 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.

[0024] The storage unit 137 is, for example, a magnetic recording device such as an HDD (Hard Disk Drive), or a storage device using a semiconductor storage element such as a flash memory or an SSD (Solid State Drive). The storage unit 137 stores programs executed by the first control unit 150, data processed by the first control unit 150, image data, etc.

[0025] The first communication interface 141 is a communication interface that communicates with the image supply device 200 in accordance with the USB (registered trademark) standard. The first communication interface 141 includes a connector for connecting a USB (registered trademark) cable and an interface circuit for processing signals 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 interface circuit that constitute 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.

[0026] The first control unit 150 includes a first memory 150B and a first processor 150A. The first memory 150B is a storage device that nonvolatilely 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 nonvolatile storage device. The first memory 150B may also include a RAM (Random Access Memory) that configures the work area of ​​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.

[0027] The first processor 150A may be configured as a single processor, or may be configured such that multiple processors function as the first processor 150A. The first processor 150A executes a first control program PGM1 to control each unit of the projector 100. For example, the first processor 150A outputs to the image processing unit 145 an instruction to execute image processing corresponding to operations received via the operation unit 131 and the remote control 5, and parameters used for this image processing. The parameters include, for example, geometric correction parameters for correcting geometric distortion of the image projected onto the screen SC. The first processor 150A also controls the light source driving unit 121 to turn on and off the light source unit 111, and adjusts the output of the light source unit 111, i.e., the light intensity. The first control unit 150 corresponds to an example of an "image processing device." The first processor 150A corresponds to an example of a "processor." The first control program PGM1 corresponds to an example of an "image processing program."

[0028] The first processor 150A may be configured as a system on chip (SoC) integrated with part or all of the first memory 150B and other circuits. The first processor 150A may also be configured as a combination of a central processing unit (CPU) that executes programs and a digital signal processor (DSP) that executes predetermined arithmetic processing. All of the functions of the first processor 150A may be implemented in hardware, or may be configured using a programmable device.

[0029] The image processing unit 145 and the frame memory 143 can be configured, for example, by an integrated circuit. Integrated circuits include large-scale integration (LSI), application-specific integrated circuits (ASIC), and programmable logic devices (PLD). PLDs include, for example, field-programmable gate arrays (FPGA). An integrated circuit may also include an analog circuit as part of its configuration, or may be a combination of a processor and an integrated circuit. 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.

[0030] 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 image data for one frame. The frame memory 143 is configured, for example, by an SDRAM (Synchronous Dynamic Random Access Memory).

[0031] 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. The image processing unit 145 also 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.

[0032] Next, the configuration of the first control unit 150 of the projector 100 will be described with reference to Fig. 2. Fig. 2 is a diagram showing an example of the configuration of the first control unit 150 of the projector 100. The first control unit 150 of the projector 100 controls the operation of the projector 100. 2, the first control unit 150 includes a projection control unit 151, a focus control unit 152, a first correction unit 153, a second correction unit 154, a communication control unit 155, and a pattern image storage unit 156. Specifically, the first processor 150A of the first control unit 150 executes a first control program PGM1 stored in a first memory 150B, causing the first control unit 150 to function as the projection control unit 151, the focus control unit 152, the first correction unit 153, the second correction unit 154, and the communication control unit 155. The first processor 150A of the first control unit 150 also executes the first control program PGM1 stored in the first memory 150B, causing the first memory 150B to function as the pattern image storage unit 156.

[0033] The pattern image storage unit 156 stores the pattern image PTN in advance. For example, the communication control unit 155 receives the pattern image PTN from the image supply device 200 and stores it in the pattern image storage unit 156. The pattern image PTN is projected onto the screen SC by the projection control unit 151. The pattern image PTN is, for example, a grid line image including black grid lines. The pattern image PTN is configured with a white solid image in areas other than the areas corresponding to the black grid lines. In other words, the pattern image PTN is an image in which a grid line image showing black grid lines is drawn on a white solid image.

[0034] The projection control unit 151 projects a pattern image PTN onto a screen SC. The screen SC includes a first area AR1 and a second area AR2 different from the first area AR1. The pattern image PTN includes a first portion PT1 and a second portion PT2 different from the first portion PT1. The projection control unit 151 projects a first portion PT1 of the pattern image PTN into the first area AR1 at a first brightness LM1, and projects a second portion PT2 of the pattern image PTN, which is different from the first portion PT1, into the second area AR2 at a second brightness LM2 higher than the first brightness LM1. A projection image PM corresponding to the pattern image PTN is displayed on the screen SC. The first luminance LM1 and the second luminance LM2 correspond to an example of the luminance LM of the pattern image PTN. The first area AR1, the second area AR2, the first portion PT1, the second portion PT2, the first luminance LM1, and the second luminance LM2 will be further described with reference to FIGS.

[0035] The focus control unit 152 focuses the projector 100 on the first area AR1 of the screen SC. The focus control unit 152 adjusts the focus adjustment mechanism of the projection optical system 113, for example, so that the first portion PT1 of the projection image PM projected on the first area AR1 of the screen SC is in focus.

[0036] The first correction unit 153 corrects uneven brightness of the projection image PM on the screen SC by reducing the brightness of the second region AR2 of the screen SC. The first correction unit 153 reduces the brightness of the second region AR2 of the screen SC by reducing the brightness LM of the second portion PT2 of the pattern image PTN. Furthermore, for the portion between the first portion PT1 and the second portion PT2 of the pattern image PTN, the first correction unit 153 reduces the brightness LM so that the amount of reduction in the brightness LM increases from the first portion PT1 toward the second portion PT2. The first correction unit 153 corrects uneven brightness of the projection image PM on the screen SC based on, for example, an operation on the operation unit 131 or an operation on the remote control 5 from the user. Furthermore, the first correction unit 153 may correct uneven brightness of the projection image PM on the screen SC based on, for example, the captured image PP of the projection image PM generated by the first camera 160A.

[0037] The second corrector 154 applies a correction process CP to the pattern image PTN to correct blurring of the projection image PM. The second corrector 154 applies the correction process CP to the second portion PT2 of the pattern image PTN, with a stronger correction strength than the correction process applied to the first portion PT1. Furthermore, the second corrector 154 applies the correction process CP between the first portion PT1 and the second portion PT2 of the pattern image PTN so that the correction strength increases from the first portion PT1 to the second portion PT2. The second correction unit 154 performs correction processing CP on the pattern image PTN to correct blurring of the projection image PM, based on, for example, a user's operation on the operation unit 131 or an operation on the remote control 5. The user's operations on the operation unit 131 or the remote controller 5 will be further described with reference to FIG. Furthermore, the second corrector 154 performs a correction process CP on the pattern image PTN to correct blurring of the projection image PM, based on the captured image PP of the projection image PM generated by the first camera 160A, for example. The correction process CP is, for example, edge enhancement process.

[0038] The communication control unit 155 receives the pattern image PTN from the image supply device 200 and stores the received pattern image PTN in the pattern image storage unit 156 .

[0039] Next, a case where the projector 100 is a short focus projector 100S will be described with reference to FIGS. FIG. 3 is a diagram showing an example of a state in which the short focus projector 100S projects onto a concave screen SC1. The concave screen SC1 corresponds to an example of the screen SC. The concave screen SC1 includes a first central area AR1C and a first edge area AR1E. The first central area AR1C is an area located at the center in the X-axis direction of the first projected image PM1 projected onto the concave screen SC1. The first edge areas AR1E are areas located on both edges in the X-axis direction of the first projected image PM1 projected onto the concave screen SC1. The first projected image PM1 represents the projected image PM projected onto the concave screen SC1. The first projected image PM1 corresponds to an example of the projected image PM.

[0040] In the initial state, when the screen SC is flat, the short focus projector 100S projects the pattern image PTN so that the brightness of the area in the projection image PM corresponding to the white solid image of the pattern image PTN becomes approximately uniform. That is, in the initial state, when the screen SC is flat, the short focus projector 100S projects the pattern image PTN so that the brightness of the central area of ​​the projection image PM matches the brightness of the edge areas of the projection image PM.

[0041] Figure 3 shows an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other. The Z-axis is parallel to the vertical direction, and the X-axis and the Y-axis are each parallel to the horizontal direction. In Figure 3, when a user stands facing the screen SC, the X-axis indicates the left-right direction, and the Y-axis indicates the front-back direction. The positive direction of the X-axis indicates the rightward direction, the positive direction of the Y-axis indicates the backward direction, i.e., the direction away from the screen SC, and the positive direction of the Z-axis indicates the upward direction. The projector 100 is disposed in the positive direction of the Y axis with respect to the screen SC. 4 to 7 also show the X-axis, Y-axis, and Z-axis.

[0042] The imaginary plane VS is a plane that includes the center of the first projection lens 113A and is parallel to the XZ plane. The first central distance L1C is the distance between the imaginary plane VS and the center of the first central area AR1C. The first edge distance L1E is the distance between the imaginary plane VS and the center of the first edge area AR1E. The first central distance L1C is longer than the first edge distance L1E. In this manner, a curved surface that is curved so that the central area of ​​the screen SC in the X-axis direction is farther away from the imaginary plane VS than the edge areas in the X-axis direction is referred to as a "concave surface" in this embodiment. In other words, the concave screen SC1 is a curved surface in which the center of the concave screen SC1 is farther from the projector 100 than the edges of the concave screen SC1. The concave screen SC1 corresponds to a partial surface of a cylinder (not shown) having a central axis parallel to the Z axis. The central axis of the cylinder (not shown) is located in the positive direction of the Y axis relative to the concave screen SC1.

[0043] The first edge distance L1E is shorter than the first central distance L1C. Also, the angle between the normal to the first edge region AR1E of the concave screen SC1 and the first image light PL1 incident on the first edge region AR1E, i.e., the angle of incidence, is smaller than the angle of incidence when the screen SC is flat. Therefore, the luminance of the first edge region AR1E of the concave screen SC1 is greater than the luminance of the edge region when the screen SC is flat.

[0044] Therefore, when the projector 100 is a short focus projector 100S and the screen SC is a concave screen SC1, the luminance of the first edge region AR1E is greater than the luminance of the first central region AR1C. That is, the first end region AR1E corresponds to an example of the second region AR2, and the first central region AR1C corresponds to an example of the first region AR1. In FIG. 3, the first end region AR1E is lightly hatched and the first central region AR1C is heavily hatched, indicating that the luminance of the first end region AR1E is greater than the luminance of the first central region AR1C.

[0045] The focus control unit 152 focuses the short focus projector 100S on the first central area AR1C of the concave screen SC1. The first corrector 153 corrects uneven brightness of the first projection image PM1 on the concave screen SC1 by reducing the brightness of the first end area AR1E of the concave screen SC1. The second correction unit 154 applies a correction process CP to the end portion PTE of the pattern image PTN corresponding to the first end region AR1E, the correction process CP having a stronger correction strength than the correction process CP to the central portion PTC of the pattern image PTN corresponding to the first central region AR1C.

[0046] 4 is a diagram showing an example of a state in which the short focus projector 100S projects onto a convex screen SC2. The convex screen SC2 corresponds to an example of the screen SC. The convex screen SC2 includes a second central region AR2C and a second edge region AR2E. The second central region AR2C is a region located at the center in the X-axis direction of the second projected image PM2 projected onto the convex screen SC2. The second edge regions AR2E are regions located on both edges in the X-axis direction of the second projected image PM2 projected onto the convex screen SC2. The second projected image PM2 represents the projected image PM projected onto the convex screen SC2. The second projected image PM2 corresponds to an example of the projected image PM.

[0047] In the initial state, when the screen SC is flat, the short focus projector 100S projects the pattern image PTN so that the brightness of the area in the projection image PM corresponding to the white solid image of the pattern image PTN becomes approximately uniform. That is, in the initial state, when the screen SC is flat, the short focus projector 100S projects the pattern image PTN so that the brightness of the central area of ​​the projection image PM matches the brightness of the edge areas of the projection image PM.

[0048] The imaginary plane VS is a plane that includes the center of the first projection lens 113A and is parallel to the XZ plane. The second central distance L2C is the distance between the imaginary plane VS and the center of the second central area AR2C. The second edge distance L2E is the distance between the imaginary plane VS and the center of the second edge area AR2E. The second edge distance L2E is longer than the second central distance L2C. In this manner, a curved surface that is curved so that the edge areas of the screen SC in the X-axis direction are farther away from the imaginary plane VS than the central area in the X-axis direction is referred to as a "convex surface" in this embodiment. In other words, the convex screen SC2 is a curved surface in which the edges of the convex screen SC2 are farther away from the projector 100 than the center of the convex screen SC2. The convex screen SC2 corresponds to a partial surface of a cylinder (not shown) having a central axis parallel to the Z axis. The central axis of the cylinder (not shown) is located in the negative direction of the Y axis relative to the convex screen SC2.

[0049] The second edge distance L2E is longer than the second central distance L2C. Furthermore, the angle between the normal to the second edge region AR2E of the convex screen SC2 and the second image light PL2 incident on the second edge region AR2E, i.e., the angle of incidence, is larger than the angle of incidence when the screen SC is flat. Therefore, the brightness of the second edge region AR2E of the convex screen SC2 is lower than the brightness of the edge region when the screen SC is flat.

[0050] Therefore, when the projector 100 is a short focus projector 100S and the screen SC is a convex screen SC2, the luminance of the second edge region AR2E is lower than the luminance of the second central region AR2C. That is, the second end region AR2E corresponds to an example of the first region AR1, and the second central region AR2C corresponds to an example of the second region AR2. In FIG. 4, the second central region AR2C is lightly hatched and the second end region AR2E is heavily hatched, indicating that the luminance of the second central region AR2C is greater than the luminance of the second end region AR2E.

[0051] The focus control unit 152 focuses the short focus projector 100S on the second end area AR2E of the convex screen SC2. The first corrector 153 corrects the uneven brightness of the second projection image PM2 on the convex screen SC2 by reducing the brightness of the second central area AR2C of the convex screen SC2. The second correction unit 154 applies a correction process CP to the central portion PTC of the pattern image PTN corresponding to the second central region AR2C, the correction process CP having a stronger correction strength than the correction process CP applied to the end portion PTE of the pattern image PTN corresponding to the second end region AR2E.

[0052] Next, a case where the projector 100 is the long focus projector 100L will be described with reference to FIGS. FIG. 5 is a diagram showing an example of a state in which the long focus projector 100L projects onto a concave screen SC3. The concave screen SC3 corresponds to an example of the screen SC. The concave screen SC3 includes a third central area AR3C and a third edge area AR3E. The third central area AR3C is an area located at the center in the X-axis direction of the third projection image PM3 projected onto the concave screen SC3. The third edge area AR3E is an area located on both edges in the X-axis direction of the third projection image PM3 projected onto the concave screen SC3. The third projection image PM3 shows the projection image PM projected onto the concave screen SC3. The third projection image PM3 corresponds to an example of the projection image PM.

[0053] In the initial state, when the screen SC is flat, the long focus projector 100L projects the pattern image PTN so that the brightness of the area in the projection image PM corresponding to the white solid image of the pattern image PTN becomes approximately uniform. That is, in the initial state, when the screen SC is flat, the long focus projector 100L projects the pattern image PTN so that the brightness of the central area of ​​the projection image PM matches the brightness of the edge areas of the projection image PM.

[0054] The imaginary plane VS is a plane that includes the center of the first projection lens 113A and is parallel to the XZ plane. The third center distance L3C is the distance between the imaginary plane VS and the center of the third center area AR3C. The third edge distance L3E is the distance between the imaginary plane VS and the center of the third edge area AR3E. The third edge distance L3E is shorter than the third center distance L3C.

[0055] The third edge distance L3E is shorter than the third central distance L3C. Furthermore, the angle between the normal to the third edge region AR3E of the concave screen SC3 and the third image light PL3 ​​incident on the third edge region AR3E, i.e., the angle of incidence, is smaller than the angle of incidence when the screen SC is flat. Therefore, the brightness of the third edge region AR3E of the concave screen SC3 is greater than the brightness of the edge region when the screen SC is flat.

[0056] Therefore, when the projector 100 is a long focus projector 100L and the screen SC is a concave screen SC3 as shown in FIG. 5, the luminance of the third edge region AR3E is greater than the luminance of the third central region AR3C. That is, the third end region AR3E corresponds to an example of the second region AR2, and the third central region AR3C corresponds to an example of the first region AR1. In FIG. 5, the third end region AR3E is lightly hatched and the third central region AR3C is heavily hatched, thereby indicating that the luminance of the third end region AR3E is greater than the luminance of the third central region AR3C.

[0057] The focus control unit 152 focuses the long focus projector 100L on the third central area AR3C of the concave screen SC3. The first corrector 153 corrects the uneven brightness of the third projected image PM3 on the concave screen SC3 by reducing the brightness of the third end area AR3E of the long focus projector 100L. The second correction unit 154 applies a correction process CP to the end portion PTE of the pattern image PTN corresponding to the third end region AR3E, the correction process CP having a stronger correction strength than the correction process CP applied to the central portion PTC of the pattern image PTN corresponding to the third central region AR3C.

[0058] Fig. 6 is a diagram showing another example of the state in which the long focus projector 100L projects onto the concave screen SC4. The concave screen SC4 has a larger curvature than the concave screen SC3 shown in Fig. 5. In other words, the concave screen SC4 has a smaller radius of curvature than the concave screen SC3 shown in Fig. 5. The concave screen SC4 corresponds to an example of the screen SC. The concave screen SC4 includes a fourth central region AR4C and a fourth edge region AR4E. The fourth central region AR4C is a region located at the center in the X-axis direction of the fourth projected image PM4 projected onto the concave screen SC4. The fourth edge region AR4E is a region located at both edges in the X-axis direction of the fourth projected image PM4 projected onto the concave screen SC4. The fourth projected image PM4 represents the projected image PM projected onto the concave screen SC4. The fourth projected image PM4 corresponds to an example of the projected image PM.

[0059] In the initial state, when the screen SC is flat, the long focus projector 100L projects the pattern image PTN so that the brightness of the area in the projection image PM corresponding to the white solid image of the pattern image PTN becomes approximately uniform. That is, in the initial state, when the screen SC is flat, the long focus projector 100L projects the pattern image PTN so that the brightness of the central area of ​​the projection image PM matches the brightness of the edge areas of the projection image PM.

[0060] The imaginary plane VS is a plane that includes the center of the first projection lens 113A and is parallel to the XZ plane. The fourth central distance L4C is the distance between the imaginary plane VS and the center of the fourth central area AR4C. The fourth edge distance L4E is the distance between the imaginary plane VS and the center of the fourth edge area AR4E. The fourth edge distance L4E is shorter than the fourth central distance L4C.

[0061] The fourth edge distance L4E is shorter than the fourth central distance L4C. Meanwhile, the angle between the normal to the fourth edge region AR4E of the concave screen SC4 and the fourth image light PL4 incident on the fourth edge region AR4E, i.e., the incident angle, is larger than the incident angle when the screen SC is flat. Figure 6 illustrates a case where the influence of the incident angle is greater than the influence of the distance. That is, the brightness of the fourth edge region AR4E of the concave screen SC4 is smaller than the brightness of the edge region when the screen SC is flat.

[0062] Therefore, when the projector 100 is a long focus projector 100L and the screen SC is a concave screen SC3 as shown in FIG. 6, the luminance of the fourth edge region AR4E is lower than the luminance of the fourth central region AR4C. That is, the fourth central region AR4C corresponds to an example of the second region AR2, and the fourth end region AR4E corresponds to an example of the first region AR1. In FIG. 6, the fourth central region AR4C is lightly hatched and the fourth end region AR4E is heavily hatched, indicating that the luminance of the fourth central region AR4C is greater than the luminance of the fourth end region AR4E.

[0063] The focus control unit 152 focuses the long focus projector 100L on the fourth end area AR4E of the concave screen SC4. The first corrector 153 corrects the uneven brightness of the fourth projected image PM4 on the concave screen SC3 by reducing the brightness of the fourth central area AR4C of the long focus projector 100L. The second correction unit 154 applies a correction process CP to the central portion PTC of the pattern image PTN corresponding to the fourth central region AR4C, the correction process CP having a stronger correction strength than the correction process CP applied to the end portion PTE of the pattern image PTN corresponding to the fourth end region AR4E.

[0064] 7 is a diagram showing an example of a state in which the long focus projector 100L projects onto a convex screen SC5. The convex screen SC5 corresponds to an example of the screen SC. The convex screen SC5 includes a fifth central region AR5C and a fifth edge region AR5E. The fifth central region AR5C is a region located at the center in the X-axis direction of the fifth projected image PM5 projected onto the convex screen SC5. The fifth edge regions AR5E are regions located on both edges in the X-axis direction of the fifth projected image PM5 projected onto the convex screen SC5. The fifth projected image PM5 represents the projected image PM projected onto the convex screen SC5. The fifth projected image PM5 corresponds to an example of the projected image PM.

[0065] In the initial state, when the screen SC is flat, the long focus projector 100L projects the pattern image PTN so that the brightness of the area in the projection image PM corresponding to the white solid image of the pattern image PTN becomes approximately uniform. That is, in the initial state, when the screen SC is flat, the long focus projector 100L projects the pattern image PTN so that the brightness of the central area of ​​the projection image PM matches the brightness of the edge areas of the projection image PM.

[0066] The imaginary plane VS is a plane that includes the center of the first projection lens 113A and is parallel to the XZ plane. The fifth central distance L5C is the distance between the imaginary plane VS and the center of the fifth central area AR5C. The fifth end distance L5E is the distance between the imaginary plane VS and the center of the fifth end area AR5E. The fifth end distance L5E is longer than the fifth central distance L5C.

[0067] The fifth edge distance L5E is longer than the fifth central distance L5C. Furthermore, the angle between the normal to the fifth edge region AR5E of the convex screen SC5 and the fifth image light PL5 incident on the fifth edge region AR5E, i.e., the angle of incidence, is greater than the angle of incidence when the screen SC is flat. Therefore, the luminance of the fifth edge region AR5E of the convex screen SC5 is lower than the luminance of the edge region when the screen SC is flat.

[0068] Therefore, when the projector 100 is the long focus projector 100L and the screen SC is the convex screen SC5, the luminance of the fifth edge region AR5E is lower than the luminance of the fifth central region AR5C. That is, the fifth central region AR5C corresponds to an example of the second region AR2, and the fifth end region AR5E corresponds to an example of the first region AR1. In FIG. 7, the fifth central region AR5C is lightly hatched and the fifth end region AR5E is heavily hatched, indicating that the luminance of the fifth central region AR5C is greater than the luminance of the fifth end region AR5E.

[0069] The focus control unit 152 focuses the long focus projector 100L on the fifth end area AR5E of the convex screen SC5. The first corrector 153 corrects the uneven brightness of the fifth projected image PM5 on the convex screen SC5 by reducing the brightness of the fifth central area AR5C of the long focus projector 100L. The second correction unit 154 applies a correction process CP to the central portion PTC of the pattern image PTN corresponding to the fifth central region AR5C, the correction process CP having a stronger correction strength than the correction process CP applied to the end portion PTE of the pattern image PTN corresponding to the fifth end region AR5E.

[0070] Next, the processing of the first control unit 150 will be described with reference to Figures 8 and 9. Figure 8 is an image diagram showing an example of the processing of the first control unit 150. The upper parts of Figures 8-9 show the transition of the pattern image PTN, and the lower parts of Figures 8-9 show the transition of the projection image PM. The left diagrams of Figures 8-9 show the initial state. The center diagrams of Figures 8-9 show the state after the luminance unevenness correction by the first correction unit 153. The right diagrams of Figures 8-9 show the state after the blur correction by the second correction unit 154. Each of the three diagrams at the top of Figures 8 to 9 shows the state of the pattern image PTN. In each of the three diagrams at the top of Figures 8 to 9, the horizontal axis indicates the widthwise position of the pattern image PTN, and the vertical axis indicates the gradation value of the luminance LM of the pattern image PTN. For convenience, in the upper parts of Figures 8 to 9, the pattern image PTN is depicted as three pulses arranged in the widthwise direction. Each of the three diagrams in the lower parts of Figures 8 to 9 shows the state of the projected image PM. In each of the three diagrams in the lower parts of Figures 8 to 9, the horizontal axis indicates the position in the width direction of the projected image PM, i.e., the X-axis direction, and the vertical axis indicates the brightness of the projected image PM. In the upper parts of Figures 8 to 9, for convenience, the projected image PM is depicted as three rectangular pulses arranged in the width direction.

[0071] As shown in the left diagram in the lower part of Fig. 8, the brightness of the edge region of the projected image PM is greater than the brightness of the central region of the projected image PM. Fig. 8 shows the processing executed by the focus control unit 152, the first correction unit 153, and the second correction unit 154 in such a case. Note that the case where the brightness of the edge region of the projected image PM is greater than the brightness of the central region of the projected image PM includes the states shown in Fig. 3 and Fig. 5.

[0072] As shown in the left diagram in the lower part of Fig. 8, when the brightness of the edge region of the projected image PM is greater than the brightness of the central region of the projected image PM, the central region of the projected image PM corresponds to an example of the first region AR1, and the edge region of the projected image PM corresponds to an example of the second region AR2. That is, as shown in the upper diagram in Fig. 8, the central portion PTC of the pattern image PTN corresponds to the first portion PT1 of the pattern image PTN, and the edge portions PTE on both sides of the pattern image PTN correspond to the second portion PT2 of the pattern image PTN.

[0073] The focus control unit 152 focuses the projector 100 on the first area AR1 of the screen SC. That is, the focus control unit 152 adjusts the focus adjustment mechanism of the projection optical system 113 so that the central area of ​​the projected image PM is in focus. In the left diagram at the bottom of FIG. 8, the centrally located pulse is depicted as a square wave, indicating that the central area of ​​the projected image PM is in focus. In the left diagram at the bottom of FIG. 8, the edge areas of the projected image PM are out of focus, indicating that the pulses located at both edges are depicted as square waves with blunted edges. Furthermore, the fact that the brightness of the edge regions of the projected image PM is greater than the brightness of the central region of the projected image PM is indicated in the lower left diagram of Figure 8 by the pulses placed at both ends being greater than the pulse placed in the center.

[0074] The first corrector 153 corrects uneven brightness of the projected image PM on the screen SC by reducing the brightness of the second area AR2 of the screen SC. As shown in the center diagram in the upper part of Fig. 8, the first corrector 153 reduces the brightness of the end portions PTE on both sides of the pattern image PTN, i.e., the second portions PT2. As a result, the heights of the pulses located at both ends of the projected image PM match the height of the pulse located in the center, as shown in the center diagram at the bottom of Figure 8. In other words, the center diagram at the bottom of Figure 8 shows that the brightness of the projected image PM has become uniform.

[0075] The second correction unit 154 applies a correction process CP to the second portion PT2 of the pattern image PTN, the correction process CP having a stronger correction strength than the correction process applied to the first portion PT1. The correction process CP is, for example, edge enhancement. The fact that the second portion PT2 is subjected to the correction process CP having a stronger correction strength than the first portion PT1 is indicated in the upper right diagram of FIG. 8 by adding a waveform that protrudes upward and downward to each end of two pulses arranged at both ends of the pattern image PTN. The right diagram in the lower part of Fig. 8 shows that the blurring of the second part PT2 is eliminated as a result of applying a correction process CP to the second part PT2 with a stronger correction strength than the first part PT1, as shown by the pulses arranged at both ends of the projected image PM changing from the dull square waves shown in the center diagram in the lower part of Fig. 8 to the square waves shown in the right diagram in the lower part of Fig. 8.

[0076] FIG. 9 is an image diagram showing another example of the processing of the first control unit 150. In FIG. As shown in the left diagram in the lower part of Fig. 9, the brightness of the central region of the projected image PM is greater than the brightness of the edge region of the projected image PM. Fig. 9 shows the processing executed by the focus control unit 152, the first correction unit 153, and the second correction unit 154 in such a case. Note that the case where the brightness of the central region of the projected image PM is greater than the brightness of the edge region of the projected image PM includes the states shown in Fig. 4, Fig. 6, and Fig. 7.

[0077] As shown in the left diagram in the lower part of Fig. 9, when the brightness of the central region of the projected image PM is greater than the brightness of the edge regions of the projected image PM, the edge regions of the projected image PM correspond to an example of the first region AR1, and the central region of the projected image PM corresponds to an example of the second region AR2. That is, as shown in the left diagram in the upper part of Fig. 9, the edge portions PTE on both sides of the pattern image PTN correspond to the first portion PT1 of the pattern image PTN, and the central portion PTC of the pattern image PTN corresponds to the second portion PT2 of the pattern image PTN.

[0078] The focus control unit 152 focuses the projector 100 on the first area AR1 of the screen SC. That is, the focus control unit 152 adjusts the focus adjustment mechanism of the projection optical system 113 so that both edge areas of the projected image PM are in focus. In the left diagram at the bottom of FIG. 9, the fact that both edge areas of the projected image PM are in focus is shown by the pulses arranged at both edges being rectangular waves. In addition, in the left diagram at the bottom of FIG. 8, the fact that the central area of ​​the projected image PM is out of focus is shown by the pulse arranged at the center being rectangular waves with blunt ends. Furthermore, the fact that the brightness of the central region of the projected image PM is greater than the brightness of the edge regions of the projected image PM is indicated in the lower left diagram of Figure 9 by the pulse located in the center being greater than the pulses located at both edges.

[0079] The first corrector 153 corrects uneven brightness of the projected image PM on the screen SC by reducing the brightness of the second area AR2 of the screen SC. As shown in the center diagram in the upper part of Fig. 9, the first corrector 153 reduces the brightness of the central portion PTC of the pattern image PTN, i.e., the second portion PT2. As a result, the height of the pulses positioned at the center of the projected image PM matches the height of the pulses positioned at both ends, as shown in the center diagram at the bottom of Figure 9. In other words, the center diagram at the bottom of Figure 9 shows that the brightness of the projected image PM has become uniform.

[0080] The second correction unit 154 applies a correction process CP to the second portion PT2 of the pattern image PTN, the correction process CP being stronger than the correction process applied to the first portion PT1. The correction process CP is, for example, edge enhancement. The fact that the second portion PT2 is subjected to the correction process CP being stronger than the first portion PT1 is indicated in the upper right diagram of FIG. 9 by adding a waveform that protrudes upward and downward to the end of the pulse located in the center of the pattern image PTN. 9, the blurring of the second portion PT2 is eliminated as a result of applying a correction process CP to the second portion PT2 with a stronger correction strength than the first portion PT1, as shown by the pulse located at the center of the projected image PM changing from the dull square wave shown in the center diagram at the bottom of FIG.

[0081] Next, a user operation accepted by the second correction unit 154 will be described with reference to Fig. 10. Fig. 10 is a screen diagram showing an example of an operation screen 300 and an operation screen 400 displayed on the remote control 5 when the second correction unit 154 accepts a user operation. The operation screen 300 is displayed on the remote controller 5 by the second corrector 154 when the edge region of the projection image PM corresponds to the second part PT2. The operation screen 400 is displayed on the remote controller 5 by the second corrector 154 when the central region of the projection image PM corresponds to the second part PT2.

[0082] The operation screen 300 includes an operation reception section 310 and a correction intensity display section 320 . The operation receiving unit 310 receives the correction strength of the correction process CP from the user. The operation receiving unit 310 corresponds to the positions in the X-axis direction shown in FIGS. 3 to 7. Position PC indicates the positions in the X-axis direction of the first central region AR1C to the fifth central region AR5C in FIGS. 3 to 7. Position PE indicates the positions in the X-axis direction of the first end region AR1E to the fifth end region AR5E in FIGS. 3 to 7. Positions P1 to P4 correspond to division points that divide the distance between positions PC and PE into five equal parts. Positions P1 to P4 are arranged from position PC toward position PE in order of proximity to position PC, with positions P1, P2, P3, and P4 being the most distant. Here, for convenience, positions P1 to P4 indicate positions in the X-axis direction of the projection image PM. On the other hand, since the correction process CP is performed on the pattern image PTN, the correction strength of the correction process CP is the correction strength for the positions of the pattern image PTN corresponding to each of positions P1 to P4 of the projection image PM.

[0083] In this embodiment, a case will be described in which the correction strength of the correction process CP for the position PC and the correction strength of the correction process CP for the position PE are set in advance. On the operation screen 300, the correction strength of the correction process CP for the position PC is "0", and the correction strength of the correction process CP for the position PE is "1". On the operation screen 300, the correction strength of the correction process CP for the position PE is stronger than the correction strength of the correction process CP for the position PC. That is, the operation screen 300 is displayed by the second corrector 154 in the states shown in FIG. 3 and FIG. 5. On the operation screen 400, the correction strength of the correction process CP for the position PC is "1," and the correction strength of the correction process CP for the position PE is "0." That is, the operation screen 400 is displayed by the second correction unit 154 in the states shown in Fig. 4, Fig. 6, and Fig. 7.

[0084] The operation reception unit 310 includes a first reception unit 311, a second reception unit 312, a third reception unit 313, and a fourth reception unit 314. The first receiving unit 311 receives the correction intensity for the position P1. The second receiving unit 312 receives the correction intensity for the position P2. The third receiving unit 313 receives the correction intensity for the position P3. The fourth receiving unit 314 receives the correction intensity for the position P4. Each of first to fourth reception units 311 to 314 includes a slide bar, and receives an operation on the slide bar from the user to receive the correction strength for positions P1 to P4.

[0085] The correction intensity display section 320 displays the correction intensity for positions P1 to P4 as a graph. The horizontal axis of the correction intensity display section 320 indicates the position in the X-axis direction, and the vertical axis of the correction intensity display section 320 indicates the correction intensity for each of positions P1 to P4.

[0086] The operation screen 400 includes an operation reception section 410 and a correction intensity display section 420 . The operation reception unit 410 includes a first reception unit 411, a second reception unit 412, a third reception unit 413, and a fourth reception unit 414. The first receiving unit 411 receives the correction intensity for the position P1. The second receiving unit 412 receives the correction intensity for the position P2. The third receiving unit 413 receives the correction intensity for the position P3. The fourth receiving unit 414 receives the correction intensity for the position P4. Each of first to fourth reception units 411 to 414 includes a slide bar, and receives an operation on the slide bar from the user to receive the correction strength for positions P1 to P4.

[0087] Correction intensity display section 420 displays the correction intensity for positions P1 to P4 as a graph. The horizontal axis of correction intensity display section 420 indicates the position in the X-axis direction, and the vertical axis of correction intensity display section 420 indicates the correction intensity for each of positions P1 to P4.

[0088] Referring to Figure 10, we have explained the case where the second correction unit 154 accepts a user operation, but even when the first correction unit 153 accepts a user operation, screens similar to the operation screen 300 and the operation screen 400 are displayed on the remote control 5. When the first correction unit 153 receives a user operation, the operation reception unit 310 of the operation screen 300 receives the amount of luminance reduction for each of the positions P1 to P4. Furthermore, when the first correction unit 153 accepts a user operation, a luminance reduction amount display unit is displayed in place of the correction intensity display unit 320 on the operation screen 300. The luminance reduction amount display unit displays the amount of luminance reduction for positions P1 to P4 as a graph. The horizontal axis of the luminance reduction amount display unit indicates the position in the X-axis direction, and the luminance reduction amount display unit indicates the amount of luminance reduction for each of positions P1 to P4. The operation screen 400 is similar to the operation screen 300.

[0089] Next, the processing of the first control unit 150 will be described with reference to Fig. 11. Fig. 11 is a flowchart showing an example of the processing of the first control unit 150. As shown in FIG. 11, first, in step S101, the projection control unit 151 projects a pattern image PTN onto a screen SC. The screen SC includes a first area AR1 and a second area AR2 different from the first area AR1. The projection control unit 151 projects a first portion PT1 of the pattern image PTN onto the first area AR1 at a first brightness LM1, and projects a second portion PT2 of the pattern image PTN, different from the first portion PT1, onto the second area AR2 at a second brightness LM2 higher than the first brightness LM1. A projection image PM corresponding to the pattern image PTN is displayed on the screen SC.

[0090] Next, in step S103, the focus control unit 152 focuses the projector 100 on the first area AR1 of the screen SC. The focus control unit 152 adjusts the focus adjustment mechanism of the projection optical system 113, for example, so that the first portion PT1 of the projection image PM projected onto the first area AR1 of the screen SC is in focus.

[0091] Next, in step S105, the first correction unit 153 corrects uneven brightness of the projection image PM on the screen SC by reducing the brightness of the second region AR2 of the screen SC. The first correction unit 153 reduces the brightness of the second region AR2 of the pattern image PTN by reducing the brightness of the second region AR2 of the screen SC. Furthermore, between the first portion PT1 and the second portion PT2 of the pattern image PTN, the first correction unit 153 reduces the brightness so that the amount of reduction in brightness increases from the first portion PT1 to the second portion PT2.

[0092] Next, in step S107, the second correction unit 154 applies a correction process CP to the pattern image PTN to correct blurring of the projection image PM. The second correction unit 154 applies the correction process CP to the second portion PT2 of the pattern image PTN, with a stronger correction strength than the correction process applied to the first portion PT1. Furthermore, the second correction unit 154 applies the correction process CP between the first portion PT1 and the second portion PT2 of the pattern image PTN so that the correction strength increases from the first portion PT1 to the second portion PT2. Then, the processing ends.

[0093] Step S101 corresponds to an example of "projecting". Step S103 corresponds to an example of "focusing". Step S105 corresponds to an example of "correcting brightness unevenness". Step S107 corresponds to an example of "performing correction processing on the projected image".

[0094] [Embodiment and Effects] As described above with reference to FIGS. 1 to 11, the image processing method for the projector 100 according to this embodiment causes the projector 100 to project a pattern image PTN onto a screen SC including a first area AR1 and a second area AR2 different from the first area AR1, and projects a first portion PT1 of the pattern image PTN onto the first area AR1 of the screen SC at a first luminance LM1, and projects a second portion PT2 different from the first portion PT1 of the pattern image PTN onto the second area AR2 of the screen SC at a second luminance LM1 higher than the first luminance LM1. M2, focusing the projector 100 on a first area AR1 of the screen SC, correcting uneven brightness of the projected image PM corresponding to the pattern image PTN on the screen SC by reducing the brightness of a second area AR2 of the screen SC, and applying a correction process CP to the pattern image PTN to correct blurring of the projected image PM, wherein the correction process CP applies a correction process to the second part PT2 of the pattern image PTN with a stronger correction strength than the correction process applied to the first part PT1.

[0095] That is, the projector 100 focuses on the first area AR1, which has a lower brightness than the second area AR2 of the screen SC, and reduces the brightness of the second area AR2 of the screen SC, thereby correcting the brightness unevenness of the projected image PM corresponding to the pattern image PTN on the screen SC. Therefore, even when the gradation value of the projected image PM is at the maximum value, the brightness unevenness of the projected image PM can be properly corrected. Furthermore, the correction process CP applies a stronger correction to the second portion PT2 of the pattern image PTN than to the first portion PT1 corresponding to the first area AR1 to be focused on, thereby making it possible to appropriately correct blurring of the projection image PM.

[0096] Furthermore, in the image processing method of the projector 100, the focal length of the projector 100 is equal to or less than the first threshold value TH1, and compared to when the screen SC is flat, the screen SC is a concave surface in which the center of the screen SC is farther away from the projector 100 than the edge of the screen SC, the first area AR1 is the central area of ​​the screen SC, and the second area AR2 is the edge area of ​​the screen SC. Therefore, as explained with reference to Figure 3, when the projector 100 is a short-focus projector 100S and the screen SC is a concave screen SC1, the brightness unevenness of the projected image PM can be properly corrected, and the blur of the projected image PM can also be properly corrected.

[0097] Furthermore, in the image processing method of the projector 100, the incident angle of the projection light irradiated from the projector 100 onto the second area AR2 is smaller on the concave surface than when the screen SC is flat. 3, the luminance of the first end region AR1E is greater than the luminance of the first central region AR1C. That is, the first end region AR1E corresponds to an example of the second region AR2, and the first central region AR1C corresponds to an example of the first region AR1. Therefore, by reducing the luminance of the first end region AR1E, it is possible to appropriately correct the luminance unevenness of the first projected image PM1 on the concave screen SC1.

[0098] Furthermore, in the image processing method of the projector 100, the focal length of the projector 100 is equal to or less than the first threshold value TH1, and compared to when the screen SC is flat, the screen SC is a convex surface in which the center of the screen SC is closer to the projector than the edge of the screen SC, the first area AR1 is the edge area of ​​the screen SC, and the second area AR2 is the central area of ​​the screen SC. Therefore, as explained with reference to Figure 4, when the projector 100 is a short-focus projector 100S and the screen SC is a convex screen SC2, the brightness unevenness of the projected image PM can be properly corrected, and the blur of the projected image PM can also be properly corrected.

[0099] Furthermore, in the image processing method of the projector 100, the convex surface has a larger incident angle of the projection light irradiated from the projector 100 onto the first area AR1 than when the screen SC is flat. 4, the luminance of the second end region AR2E is lower than the luminance of the second central region AR2C. That is, the second end region AR2E corresponds to an example of the first region AR1, and the second central region AR2C corresponds to an example of the second region AR2. Therefore, by reducing the luminance of the second central region AR2C, it is possible to appropriately correct the luminance unevenness of the second projected image PM2 on the convex screen SC2.

[0100] Furthermore, in the image processing method of the projector 100, the focal length of the projector 100 is equal to or greater than the second threshold value TH2, and compared to when the screen SC is flat, the screen SC is concave with the center of the screen SC being farther away from the projector 100 than the edges of the screen SC, the first area AR1 is the central area of ​​the screen SC, and the second area AR2 is the edge area of ​​the screen SC. Therefore, as explained with reference to Figure 5, when the projector 100 is a long focus projector 100L and the screen SC is a concave screen SC3, the brightness unevenness of the projected image PM can be properly corrected, and the blur of the projected image PM can also be properly corrected.

[0101] Furthermore, in the image processing method of the projector 100, the incident angle of the projection light irradiated from the projector 100 onto the second area AR2 is smaller on the concave surface than when the screen SC is flat. 5, the luminance of the third edge region AR3E is greater than the luminance of the third central region AR3C. That is, the third edge region AR3E corresponds to an example of the second region AR2, and the third central region AR3C corresponds to an example of the first region AR1. Therefore, by reducing the luminance of the third edge region AR3E, it is possible to appropriately correct luminance unevenness of the third projected image PM3 on the concave screen SC3.

[0102] Furthermore, in the image processing method of the projector 100, the focal length of the projector 100 is equal to or greater than the second threshold value TH2, and compared to when the screen SC is flat, the screen SC is concave with the center of the screen SC being farther away from the projector 100 than the edge of the screen SC, the first area AR1 is the edge area of ​​the screen SC, and the second area AR2 is the central area of ​​the screen SC. Therefore, as described with reference to Fig. 6, when the projector 100 is the long focus projector 100L and the screen SC is the concave screen SC4, it is possible to appropriately correct uneven brightness of the projected image PM and also to appropriately correct blurring of the projected image PM. Note that the concave screen SC4 has a smaller radius of curvature than the concave screen SC3 shown in Fig. 5.

[0103] Furthermore, in the image processing method of the projector 100, the concave surface has a larger incident angle of the projection light irradiated from the projector 100 onto the first area AR1 than when the screen SC is flat. 6, the luminance of the fourth edge region AR4E is lower than the luminance of the fourth central region AR4C. That is, the fourth central region AR4C corresponds to an example of the second region AR2, and the fourth edge region AR4E corresponds to an example of the first region AR1. Therefore, by reducing the luminance of the fourth central region AR4C, it is possible to appropriately correct the luminance unevenness of the fourth projected image PM4 on the concave screen SC3.

[0104] Furthermore, in the image processing method of the projector 100, the focal length of the projector 100 is equal to or greater than the second threshold value TH2, and compared to when the screen SC is flat, the screen SC is a convex surface in which the center of the screen SC is closer to the projector than the edges of the screen SC, the first area AR1 is the edge area of ​​the screen SC, and the second area AR2 is the central area of ​​the screen SC. Therefore, as explained with reference to Figure 7, when the projector 100 is a long-focus projector 100L and the screen SC is a convex screen SC5, the brightness unevenness of the projected image PM can be properly corrected, and the blur of the projected image PM can also be properly corrected.

[0105] Furthermore, in the image processing method of the projector 100, the convex surface has a larger incident angle of the projection light irradiated from the projector 100 onto the first area AR1 than when the screen SC is flat. 7, the luminance of the fifth end region AR5E is lower than the luminance of the fifth central region AR5C. That is, the fifth central region AR5C corresponds to an example of the second region AR2, and the fifth end region AR5E corresponds to an example of the first region AR1. Therefore, by reducing the luminance of the fifth central region AR5C, it is possible to appropriately correct luminance unevenness of the fifth projected image PM5 on the convex screen SC5.

[0106] In the image processing method of the projector 100, correcting the luminance unevenness of the projection image PM includes accepting a user's operation on a graph showing the relationship between the position on the screen SC and the luminance. Therefore, it is possible to accept a user's operation on the graph showing the relationship between the position on the screen SC and the brightness, and correct brightness unevenness in the projection image PM in accordance with the accepted user's operation, thereby improving user convenience.

[0107] Furthermore, in the image processing method of the projector 100, applying the correction process CP to the pattern image PTN includes accepting a user's operation on a graph showing the relationship between the position on the screen SC and the correction intensity. Therefore, it is possible to accept a user's operation on the graph showing the relationship between the position of the screen SC and the correction strength, and to apply the correction process CP to the pattern image PTN in accordance with the accepted user's operation, thereby improving user convenience.

[0108] The first control program PGM1 according to this embodiment controls the first processor 150A of the projector 100 to project a pattern image PTN onto a screen SC including a first area AR1 and a second area AR2 different from the first area AR1, and projects a first portion PT1 of the pattern image PTN onto the first area AR1 of the screen SC at a first luminance LM1, and projects a second portion PT2 different from the first portion PT1 of the pattern image PTN onto the second area AR2 of the screen SC at a second luminance LM2 higher than the first luminance LM1. The projector 100 functions as a focus control unit 152 that focuses the projector 100 on a first area AR1 of the screen SC, a first correction unit 153 that corrects uneven brightness of the projected image PM corresponding to the pattern image PTN on the screen SC by reducing the brightness of a second area AR2 of the screen SC, and a second correction unit 154 that applies a correction process CP to the pattern image PTN to correct blurring of the projected image PM, and the second correction unit 154 applies a correction process to the second part PT2 of the pattern image PTN that has a stronger correction strength than the correction process to the first part PT1. Therefore, the first control program PGM1 according to this embodiment can achieve the same effects as the image processing method of the projector 100 according to this embodiment.

[0109] The first control unit 150 according to the present embodiment includes a projection control unit 151 that causes the projector 100 to project a pattern image PTN onto a screen SC including a first area AR1 and a second area AR2 different from the first area AR1, and projects a first portion PT1 of the pattern image PTN onto the first area AR1 of the screen SC at a first luminance LM1, and projects a second portion PT2 different from the first portion PT1 of the pattern image PTN onto the second area AR2 of the screen SC at a second luminance LM2 higher than the first luminance LM1; The projector 100 includes a focus control unit 152 that focuses the projector 100 on the area AR1, a first correction unit 153 that corrects uneven brightness of the projected image PM corresponding to the pattern image PTN on the screen SC by reducing the brightness of the second area AR2 of the screen SC, and a second correction unit 154 that applies a correction process CP to the pattern image PTN to correct blurring of the projected image PM, and the second correction unit 154 applies a correction process to the second part PT2 of the pattern image PTN that has a stronger correction strength than the correction process to the first part PT1. Therefore, the first control unit 150 according to this embodiment can achieve the same effects as the image processing method of the projector 100 according to this embodiment.

[0110] [Other embodiments] The above-described embodiment is a preferred embodiment, but is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the present invention.

[0111] In this embodiment, the screen SC has a central axis parallel to the Z axis and is part of a cylinder, but the embodiment is not limited to this. For example, the screen SC may have a central axis parallel to the X axis and be part of a cylinder. Also, for example, the screen SC may be part of the surface of a sphere. Furthermore, for example, the screen SC may be a screen in which a right-side flat screen and a left-side flat screen are joined at the center in the X-axis direction. In this case, a concave screen bent at the center in the X-axis direction and a convex screen can be easily formed.

[0112] In the present embodiment, the case where the "image processing device" is the first control unit 150 has been described, but the embodiment is not limited to this. The "image processing device" may be the image supply device 200, for example. In other words, although the first control unit 150 of the projector 100 has been described as having a projection control unit 151, a focus control unit 152, a first correction unit 153, a second correction unit 154, and a communication control unit 155, the embodiment is not limited to this. For example, the second control unit of the image supply device 200 may include a projection control unit 151, a focus control unit 152, a first correction unit 153, and a second correction unit 154. Furthermore, the "image processing device" may be, for example, a server device (not shown).

[0113] In this embodiment, the case where the "projected image" is a pattern image PTN will be described, but the embodiment is not limited to this. For example, the "projected image" may be a solid white image. In this case, the processing of the first correction unit 153 becomes easier. The "projected image" may also include a pattern image PTN and a solid white image. In this case, for example, when the focus control unit 152 executes processing and when the second correction unit 154 executes processing, it is preferable that the projection control unit 151 projects the pattern image PTN onto the screen SC. Also, for example, when the first correction unit 153 executes processing, it is preferable that the projection control unit 151 projects a solid white image onto the screen SC.

[0114] Furthermore, each functional unit shown in FIG. 2 indicates a functional configuration, and the specific implementation form is not particularly limited. In other words, it is not necessary to implement hardware corresponding to each functional unit individually, and it is also possible to configure a configuration in which a single processor executes a program to realize the functions of multiple functional units. Furthermore, some of the functions realized by software in the above embodiments 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 as desired without departing from the spirit of the invention.

[0115] 11 are divided according to the main processing content in order to make it easier to understand the processing of first control unit 150 of projector 100. There is no limitation to the division method or names of the processing units shown in the flowchart of FIG. 11, and the processing can be divided into more processing units according to the processing content, or one processing unit can be divided so as to include more processes. Furthermore, the processing order of the above flowchart is not limited to the example shown in the drawing.

[0116] Furthermore, the image processing 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 that corresponds to the image processing method of the projector 100. Furthermore, the first control program PGM1 can also be recorded on 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 RAM, ROM, or HDD, which is an internal storage device provided in projector 100. The method for controlling the projector 100 can also be realized by storing the first control program PGM1 in a server device or the like and downloading the first control program PGM1 from the server device to the projector 100.

[0117] [Note] A summary of this disclosure is provided below. (Appendix 1) an image processing method for a projector, the image processing method including: causing a projector to project a projected image onto a projection surface including a first region and a second region different from the first region; projecting a first portion of the projected image onto the first region of the projection surface at a first luminance; and projecting a second portion of the projected image different from the first portion onto the second region of the projection surface at a second luminance higher than the first luminance; focusing the projector on the first region of the projection surface; correcting luminance unevenness of the projected image corresponding to the projected image on the projection surface by reducing the luminance of the second region of the projection surface; and performing a correction process on the projected image to correct blurring of the projected image, wherein the correction process performs a correction process on the second portion of the projected image with a stronger correction strength than the correction process on the first portion.

[0118] This allows the projector to focus on the first area, which has lower brightness than the second area of ​​the projection surface, and reduces the brightness of the second area of ​​the projection surface, thereby correcting brightness unevenness in the projected image corresponding to the projected image on the projection surface. Therefore, even when the gradation value of the projected image is at its maximum value, brightness unevenness in the projected image can be properly corrected. Furthermore, the correction process is performed on the second portion of the projected image with a stronger correction strength than the correction process performed on the first portion of the projected image corresponding to the first area to be focused on, thereby making it possible to appropriately correct blurring of the projected image.

[0119] (Appendix 2) The image processing method of the projector described in Appendix 1, wherein the projector has a focal length equal to or less than a first threshold, and the projection surface is a concave surface in which the center of the projection surface is farther from the projector than the edge of the projection surface, the first area is a central area of ​​the projection surface, and the second area is an edge area of ​​the projection surface, compared to when the projector has a flat surface.

[0120] As a result, when the focal length is equal to or less than the first threshold and the projection surface is concave, the projector can properly correct uneven brightness of the projected image and can also properly correct blurring of the projected image.

[0121] (Appendix 3) The image processing method of the projector described in Appendix 2, wherein the concave surface has a smaller incident angle of the projection light irradiated from the projector onto the second area than when the projection surface is flat.

[0122] As a result, when the focal length is equal to or less than the first threshold and the projection surface is concave, the brightness of the edge areas of the projection surface is greater than the brightness of the central area of ​​the projection surface, and therefore the brightness of the projected image can be appropriately corrected by reducing the brightness of the edge areas of the projection surface, which are the second areas.

[0123] (Appendix 4) The image processing method of the projector described in Appendix 1, wherein the projector has a focal length equal to or less than a first threshold, and the projection surface is a convex surface in which the center of the projection surface is closer to the projector than the edges of the projection surface, compared to when the projection surface is flat, the first area is an edge area of ​​the projection surface, and the second area is a central area of ​​the projection surface.

[0124] As a result, when the focal length is equal to or less than the first threshold and the projection surface is a convex surface, the projector can properly correct uneven brightness of the projected image and can also properly correct blurring of the projected image.

[0125] (Appendix 5) 5. The image processing method of the projector described in Appendix 4, wherein the convex surface has a larger incident angle of the projection light irradiated from the projector onto the first area than when the projection surface is flat.

[0126] As a result, when the focal length is equal to or less than the first threshold and the projection surface is convex, the brightness of the edge areas of the projection surface is lower than the brightness of the central area of ​​the projection surface, and therefore the brightness of the projected image can be appropriately corrected by reducing the brightness of the central area of ​​the projection surface, which is the second area.

[0127] (Appendix 6) The image processing method of the projector described in Appendix 1, wherein the projector has a focal length equal to or greater than a second threshold, and the projection surface is a concave surface in which the center of the projection surface is farther from the projector than the edge of the projection surface, compared to when the projection surface is flat, the first area is a central area of ​​the projection surface, and the second area is an edge area of ​​the projection surface.

[0128] As a result, when the focal length is equal to or greater than the second threshold and the projection surface is concave, the projector can properly correct uneven brightness of the projected image and can also properly correct blurring of the projected image.

[0129] (Appendix 7) 7. The image processing method of the projector described in Appendix 6, wherein the concave surface has a smaller incident angle of the projection light irradiated from the projector onto the second area than when the projection surface is flat.

[0130] As a result, when the focal length of the projector is equal to or greater than the second threshold and the projection surface is concave, the brightness of the edge areas of the projection surface is greater than the brightness of the central area of ​​the projection surface. Therefore, by reducing the brightness of the edge areas of the projection surface, which are the second areas, the brightness of the projected image can be appropriately corrected.

[0131] (Appendix 8) The image processing method of the projector described in Appendix 1, wherein the projector has a focal length equal to or greater than a second threshold, and compared to when the projection surface is flat, the projection surface is a concave surface in which the center of the projection surface is farther from the projector than the edge of the projection surface, the first area is an area at the edge of the projection surface, and the second area is an area at the center of the projection surface.

[0132] As a result, when the focal length is equal to or greater than the second threshold and the projection surface is concave, the projector can properly correct uneven brightness of the projected image and can also properly correct blurring of the projected image.

[0133] (Appendix 9) 9. The image processing method of the projector described in Appendix 8, wherein the concave surface has a larger incident angle of the projection light irradiated from the projector onto the first area than when the projection surface is flat.

[0134] As a result, when the focal length of the projector is equal to or greater than the second threshold and the projection surface is concave, the brightness of the edge areas of the projection surface is lower than the brightness of the central area of ​​the projection surface, and therefore the brightness of the projected image can be appropriately corrected by reducing the brightness of the central area of ​​the projection surface, which is the second area.

[0135] (Appendix 10) The image processing method of the projector described in Appendix 1, wherein the projector has a focal length equal to or greater than a second threshold, and the projection surface is a convex surface in which the center of the projection surface is closer to the projector than the edges of the projection surface, compared to when the projection surface is flat, the first area is an edge area of ​​the projection surface, and the second area is a central area of ​​the projection surface.

[0136] As a result, when the focal length is equal to or greater than the second threshold and the projection surface is a convex surface, the projector can properly correct uneven brightness of the projected image and can also properly correct blurring of the projected image.

[0137] (Appendix 11) 11. The image processing method of the projector described in Appendix 10, wherein the convex surface has a larger angle of incidence of the projection light irradiated from the projector onto the first area than when the projection surface is flat.

[0138] As a result, when the focal length of the projector is equal to or greater than the second threshold and the projection surface is convex, the brightness of the edge areas of the projection surface is lower than the brightness of the central area of ​​the projection surface, and therefore the brightness of the projected image can be appropriately corrected by reducing the brightness of the second area, that is, the central area of ​​the projection surface.

[0139] (Appendix 12) An image processing method for a projector described in any one of Appendix 1 to Appendix 11, wherein correcting the brightness unevenness of the projected image includes accepting user operations on a graph showing the relationship between the position of the projection surface and brightness.

[0140] This allows the user to input operations on the graph showing the relationship between the position on the projection surface and the brightness, and corrects brightness variations in the projected image in accordance with the input operations, thereby improving user convenience.

[0141] (Appendix 13) An image processing method for a projector described in any one of Appendix 1 to Appendix 11, wherein applying the correction processing to the projected image includes accepting user operations on a graph showing the relationship between the position of the projection surface and the correction intensity.

[0142] This allows the user to input a correction value to the graph showing the relationship between the projection surface position and the correction strength, and to apply correction processing to the projected image in accordance with the input. This improves user convenience.

[0143] (Appendix 14) an image processing program that causes a processor of an image processing device to function as a projection control unit that causes a projector to project a projected image onto a projection surface including a first region and a second region different from the first region, and projects a first portion of the projected image onto the first region of the projection surface at a first brightness and a second portion of the projected image different from the first portion onto the second region of the projection surface at a second brightness higher than the first brightness; a focus control unit that focuses the projector on the first region of the projection surface; a first correction unit that corrects brightness unevenness of the projected image corresponding to the projected image on the projection surface by reducing the brightness of the second region of the projection surface; and a second correction unit that applies a correction process to the projected image to correct blurring of the projected image, and the second correction unit applies a correction process to the second portion of the projected image with a stronger correction strength than the correction process to the first portion.

[0144] As a result, the image processing program described in Supplementary Note 14 has the same effect as the image processing method for the projector described in Supplementary Note 1.

[0145] (Appendix 15) an image processing device comprising: a projection control unit that causes a projector to project a projected image onto a projection surface including a first region and a second region different from the first region, and projects a first portion of the projected image onto the first region of the projection surface at a first luminance and a second portion of the projected image different from the first portion onto the second region of the projection surface at a second luminance higher than the first luminance; a focus control unit that focuses the projector on the first region of the projection surface; a first correction unit that corrects luminance unevenness of a projected image corresponding to the projected image on the projection surface by reducing the luminance of the second region of the projection surface; and a second correction unit that applies a correction process to the projected image to correct blurring of the projected image, wherein the second correction unit applies a correction process to the second portion of the projected image with a stronger correction strength than the correction process to the first portion.

[0146] As a result, the image processing device described in Supplementary Note 15 has the same effect as the image processing method for the projector described in Supplementary Note 1. [Explanation of symbols]

[0147] 1...image projection system, 100...projector, 100L...long focus projector, 100S...short focus projector, 111...light source unit, 113...projection optical system, 113A...first projection lens, 115...liquid crystal panel, 150...first control unit (image processing device), 150A...first processor (processor), 150B...first memory, 151...projection control unit, 152...focus control unit, 153...first correction unit, 154...second correction unit, 155...communication control unit, 156... Pattern image memory unit, 160A...first camera, 200...image supply device, AR1...first region, AR2...second region, CP...correction processing, LM...brightness, LM1...first brightness, LM2...second brightness, PGM1...first control program (image processing program), PM...projected image, PT1...first part, PT2...second part, PTC...central part, PTE...edge part, PTN...pattern image (projected image), SC...screen (projection surface), TH1...first threshold, TH2...second threshold.

Claims

1. causing a projector to project a projected image onto a projection surface including a first area and a second area different from the first area, projecting a first portion of the projected image onto the first area of ​​the projection surface at a first luminance, and projecting a second portion of the projected image different from the first portion onto the second area of ​​the projection surface at a second luminance higher than the first luminance; focusing the projector on the first area of ​​the projection surface; correcting uneven brightness of a projected image corresponding to the projected image on the projection surface by reducing brightness of the second region of the projection surface; performing a correction process on the projected image to correct blurring of the projected image; Including, The image processing method of the projector, wherein the correction processing is performed on the second portion of the projected image with a correction strength higher than that of the correction processing performed on the first portion.

2. The projector has a focal length equal to or less than a first threshold, the projection surface is a concave surface in which the center of the projection surface is farther from the edge of the projection surface as viewed from the projector than when the projection surface is a flat surface, the first region is a central region of the projection surface, the second region is an edge region of the projection surface; The image processing method for the projector according to claim 1 .

3. the concave surface has a smaller incident angle of the projection light emitted from the projector to the second area than when the projection surface is a flat surface; The image processing method for a projector according to claim 2 .

4. The projector has a focal length equal to or less than a first threshold, the projection surface is a convex surface in which the center of the projection surface is closer than the edge of the projection surface as viewed from the projector, compared to when the projection surface is a flat surface; the first region is a region at an edge of the projection surface, The second region is a central region of the projection surface. The image processing method for the projector according to claim 1 .

5. the convex surface has a larger incident angle of the projection light emitted from the projector to the first area than when the projection surface is a flat surface; The image processing method for a projector according to claim 4 .

6. The projector has a focal length equal to or greater than a second threshold, the projection surface is a concave surface in which the center of the projection surface is farther from the edge of the projection surface as viewed from the projector than when the projection surface is a flat surface, the first region is a central region of the projection surface, the second region is an edge region of the projection surface; The image processing method for the projector according to claim 1 .

7. the concave surface has a smaller incident angle of the projection light emitted from the projector to the second area than when the projection surface is a flat surface; The image processing method for a projector according to claim 6 .

8. The projector has a focal length equal to or greater than a second threshold, the projection surface is a concave surface in which the center of the projection surface is farther from the edge of the projection surface as viewed from the projector than when the projection surface is a flat surface, the first region is a region at an edge of the projection surface, The second region is a central region of the projection surface. The image processing method for the projector according to claim 1 .

9. the concave surface has a larger incident angle of the projection light emitted from the projector onto the first area than when the projection surface is a flat surface; The image processing method for a projector according to claim 8 .

10. The projector has a focal length equal to or greater than a second threshold, the projection surface is a convex surface in which the center of the projection surface is closer than the edge of the projection surface as viewed from the projector, compared to when the projection surface is a flat surface; the first region is a region at an edge of the projection surface, The second region is a central region of the projection surface. The image processing method for the projector according to claim 1 .

11. the convex surface has a larger incident angle of the projection light emitted from the projector to the first area than when the projection surface is a flat surface; The image processing method for a projector according to claim 10.

12. Correcting the luminance unevenness of the projection image includes: receiving a user's operation on a graph showing a relationship between the position on the projection surface and the luminance; The image processing method for a projector according to claim 1 .

13. The correction processing is performed on the projected image. receiving a user's operation on a graph showing the relationship between the position on the projection surface and the correction intensity; The image processing method for a projector according to claim 1 .

14. The processor of the image processing device, a projection control unit that causes the projector to project a projected image onto a projection surface including a first region and a second region different from the first region, and projects a first portion of the projected image onto the first region of the projection surface at a first luminance, and projects a second portion of the projected image different from the first portion onto the second region of the projection surface at a second luminance higher than the first luminance; a focus control unit that focuses the projector on the first area of ​​the projection surface; a first correction unit that corrects uneven brightness of a projection image corresponding to the projected image on the projection surface by reducing the brightness of the second region of the projection surface; and a second correction unit that performs a correction process on the projected image to correct blurring of the projected image; The second correction unit performs a correction process on the second portion of the projected image, the correction process having a stronger correction strength than the correction process on the first portion.

15. a projection control unit that causes the projector to project a projected image onto a projection surface including a first region and a second region different from the first region, and projects a first portion of the projected image onto the first region of the projection surface at a first luminance, and projects a second portion of the projected image different from the first portion onto the second region of the projection surface at a second luminance higher than the first luminance; a focus control unit that focuses the projector on the first area of ​​the projection surface; a first correction unit that corrects uneven brightness of a projected image corresponding to the projected image on the projection surface by reducing the brightness of the second region of the projection surface; a second correction unit that applies a correction process to the projected image to correct blurring of the projected image, the second correction unit performs a correction process on the second portion of the projected image, the correction process having a stronger correction strength than the correction process on the first portion; Image processing device.

Images