Control device, control method, and control program

Abstract

The invention provides a control device, a control method and a control program capable of performing color adjustment among a plurality of projectors in a short time. The control device includes a processor (51) that instructs the first projection device (10a) to project in a first color that is an adjusted color, acquires a color measurement value of light projected from the first projection device (10a) (XYZ first color PJ1), instructs the second projection device (10b) to project in the first color, acquires a color measurement value of light projected from the second projection device (10b) (XYZ first color PJ2), and acquires a color measurement value of light projected from the second projection device (10b). On the basis of a lookup table (62) for a first color indicating the relationship between the color adjustment parameter (P) and the position in the Lab color space (61), a color measurement value (XYZ first color PJ1) of the first projection device (10a), and a color measurement value (XYZ first color PJ2) of the second projection device (10b), a color adjustment parameter (Ppred) is determined such that the position of the color measurement value (XYZ first color PJ1) in the Lab color space (61) approaches the position of the color measurement value (XYZ first color PJ2) in the Lab color space (61).

Description

TECHNICAL FIELD

[0001] The present application relates to a control device, a control method, and a control program. BACKGROUND

[0002] In Patent Literature 1, an image projection system is described, which includes a determination unit that determines an image area on a screen in which image information is displayed, a projection control unit that causes an adjustment pattern to be projected on the screen by a projection unit, the adjustment pattern being used to obtain an adjustment value used when adjusting a display mode of the image information, and being generated so as to be projected on the determined image area, an image generation device that generates the image information based on input information, and the projection unit that projects the generated image information on the screen.

[0003] In Patent Literature 2, an image projection system is described, which includes a first projector having a first projection unit that projects a first image and a first photographing unit that photographs a range including at least a part of the first image projected by the first projection unit and at least a part of a second image projected by a second projector, and the second projector having a second projection unit that projects the second image, determines a target color based on a first photographed image obtained by the first photographing unit photographing at least a part of the first image projected by the first projection unit, and obtains first correction data that corrects a color of a projection image of the second projector to the target color based on a second photographed image obtained by the first photographing unit photographing at least a part of the second image projected by the second projector.

[0004] PRIOR ART DOCUMENT PATENT LITERATURE Patent Literature 1: Japanese Patent Application Publication No. 2022-077773 Patent Literature 2: Japanese Patent Application Publication No. 2017-083672 SUMMARY

[0005] One embodiment of the present application provides a control device, a control method, and a control program that can perform color adjustment between a plurality of projectors in a short time.

[0006] MEANS FOR SOLVING THE TECHNICAL PROBLEM The control device of the present application includes a processor that performs the following processes: acquires a first colorimetric value of light of a first color adjusted by a first projection device; acquires a second colorimetric value of light of the first color adjusted by a second projection device; and determines a first color adjustment parameter based on adjustment data of the first color indicating a relationship between a color adjustment parameter and a position in a specific color space, the first colorimetric value, and the second colorimetric value, so that the position of the first colorimetric value in the specific color space approaches the position of the second colorimetric value in the specific color space.

[0007] In the control method of the present application, a processor included in a control device performs the following processes: acquires a first colorimetric value of light of a first color adjusted by a first projection device; acquires a second colorimetric value of light of the first color adjusted by a second projection device; and determines a first color adjustment parameter based on adjustment data of the first color indicating a relationship between a color adjustment parameter and a position in a specific color space, the first colorimetric value, and the second colorimetric value, so that the position of the first colorimetric value in the specific color space approaches the position of the second colorimetric value in the specific color space.

[0008] In the control program of the present application, a processor included in a control device performs the following processes: acquires a first colorimetric value of light of a first color adjusted by a first projection device; acquires a second colorimetric value of light of the first color adjusted by a second projection device; and determines a first color adjustment parameter based on adjustment data of the first color indicating a relationship between a color adjustment parameter and a position in a specific color space, the first colorimetric value, and the second colorimetric value, so that the position of the first colorimetric value in the specific color space approaches the position of the second colorimetric value in the specific color space.

[0009] Effects of the Invention According to the present application, a control device, a control method, and a control program that enable color adjustment between a plurality of projectors to be performed in a short time can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 FIG. 1 is a diagram showing an example of a projection system 100 according to an embodiment.

[0011] Figure 2 FIG. 2 is a diagram showing an example of a first projection device 10a and a second projection device 10b.

[0012] Figure 3 FIG. 3 is a diagram showing an example of an internal structure of a projection unit 1.

[0013] Figure 4is a schematic diagram showing the external structure of the projection device 10.

[0014] Figure 5 is Figure 4 is a cross-sectional schematic diagram of the optical unit 106 of the projection device 10.

[0015] Figure 6 is a diagram showing an example of the hardware structure of the computer 50.

[0016] Figure 7 is a diagram showing a state in which a lookup table for color adjustment is generated.

[0017] Figure 8 is a diagram showing an example of a generation process of the lookup table.

[0018] Figure 9 is a flowchart showing a process of generating the lookup table by the processor 51 of the computer 50.

[0019] Figure 10 is a diagram showing an example of the color adjustment parameters P (p1, p2, p3).

[0020] Figure 11 is a diagram showing an example of the lookup table when the color is adjusted to white.

[0021] Figure 12 is a flowchart showing a color adjustment process using the lookup table by the processor 51 of the computer 50.

[0022] Figure 13 is a flowchart showing a determination process of the color adjustment parameters by the processor 51.

[0023] Figure 14 is a diagram showing a setting position in the Lab color space in the determination process of the color adjustment parameters.

[0024] Figure 15 is a diagram showing a determination of the color adjustment parameters in the determination process of the color adjustment parameters.

[0025] Figure 16 is a flowchart showing a variation of the color adjustment process using the lookup table by the processor 51.

[0026] Figure 17 is a flowchart showing a variation of the determination process of the color adjustment parameters by the processor 51.

[0027] Figure 18 is a diagram showing an example in which a projection device having a larger Y value (luminance) is set as an adjustment projection device (Adj).

[0028] Figure 19is a view showing an example of setting a projection device having a smaller Y value (luminance) as an adjustment projection device (Adj).

[0029] Figure 20 is a view showing an example of determining a color adjustment parameter based on a chromaticity difference.

[0030] Figure 21 is a view showing an example of performing color adjustment in an environment in which stray light is present.

[0031] Figure 22 is a view showing an example of performing color measurement on stray light in an environment in which only stray light is present.

[0032] Figure 23 is a view showing an example of a state in which a color measurement position is unstable at the time of color measurement.

[0033] Figure 24 is a view showing an example of a guide line 92 for guiding a color measurement position.

[0034] Figure 25 is a view showing Figure 24 a state in which the guide line 92 shown in Fig. 55 disappears.

[0035] Figure 26 is a view showing a modified example of a guide line for guiding a color measurement position.

[0036] Figure 27 is a view showing an example of a projection range of an image at the time of color measurement.

[0037] Figure 28 is a view showing another external structure of the projection device 10.

[0038] Figure 29 is Figure 21 a cross-sectional view of the optical unit 106 of the projection device 10 shown in Fig. 56. DETAILED DESCRIPTION

[0039] Hereinafter, an example of an embodiment of the present application will be described with reference to the drawings.

[0040] (Embodiment) <Projection System 100 of Embodiment> Figure 1 is a view showing an example of the projection system 100 of the embodiment. As shown in Figure 1 the projection system 100 is provided with a first projection device 10a, a second projection device 10b, a computer 50, and a colorimeter 131. The computer 50 is an example of the "control device" in the present application.

[0041] The computer 50 is capable of communicating with the first projection device 10a and the second projection device 10b. In the present embodiment, the computer 50 is capable of communicating with the first projection device 10a and the second projection device 10b.Figure 1 In the example shown, the computer 50 is connected to the first projection device 10a via the communication cable 8a and is able to communicate with the first projection device 10a. Also, the computer 50 is connected to the second projection device 10b via the communication cable 8b and is able to communicate with the second projection device 10b. In addition, the computer 50 can also be connected directly or indirectly to the first projection device 10a and the second projection device 10b. Also, the first projection device 10a and the second projection device 10b can be integrated with the computer 50.

[0042] The first projection device 10a and the second projection device 10b are projection devices that can project onto the projection target 6. The colorimeter 131 is a device that is able to measure the colorimetric values of light projected from the first projection device 10a and the second projection device 10b onto the projection target 6.

[0043] The colorimeter 131, for example, measures the tristimulus values XYZ of the XYZ colorimetric system. For example, the colorimeter 131 measures the colorimetric values in a state in which it is installed on the tripod 132. In Figure 1 In the example shown, the colorimeter 131 measures the colorimetric values of light projected from the first projection device 10a. The computer 50 acquires the colorimetric values measured by the colorimeter 131. In addition, the colorimetric values can also be acquired by photographing with a camera (a camera built into the first projection device 10a or the second projection device 10b or the computer 50, or an external camera). Also, the computer 50 is an example of a control device in the present embodiment, but the first projection device 10a or the second projection device 10b can also be an example of a control device.

[0044] The projection target 6 is an object such as a wall that has a projection surface on which a projection image is displayed by the first projection device 10a and the second projection device 10b. In Figure 1 In the example shown, the projection surface of the projection target 6 is a flat wall that is rectangular. The wall, for example, is a projection surface that has irregularities such as wall joints, obstacles such as recessed outlets on the wall surface, wall patterns, or sometimes the shadows of other objects. Assume Figure 1 In the example shown, the upper and lower left and right of the projection target 6 are the upper and lower left and right of the actual projection target 6.

[0045] The projection range 11a illustrated by the single-dot chain line on the left is a region in the projection target 6 in which projection light is irradiated by the first projection device 10a. The projection range 11a is part or all of the projectable range in which projection is possible by the first projection device 10a. The projection range 11b illustrated by the single-dot chain line on the right is a region in the projection target 6 in which projection light is irradiated by the second projection device 10b. The projection range 11b is part or all of the projectable range in which projection is possible by the second projection device 10b. InFigure 1 In the example, the projection ranges 11a, 11b are rectangular.

[0046] <First and second projection devices 10a and 10b> Figure 2 is a diagram showing an example of the first and second projection devices 10a and 10b. The first and second projection devices 10a and 10b are each configured by, for example, the projection device 10 shown in Figure 2 The projection device 10 has a projection unit 1, a control unit 4, an operation reception unit 2, and a communication unit 5. The projection unit 1 is configured by, for example, a projector using a liquid crystal projector or an LCOS (Liquid Crystal On Silicon), or the like. Hereinafter, the projection unit 1 is described as a liquid crystal projector.

[0047] The control unit 4 performs control of projection by the projection device 10. The control unit 4 is a device including a control unit configured by various processors, a communication interface (not shown) for communication with each unit, and a storage medium 4a such as a hard disk, an SSD (Solid State Drive), or a ROM (Read Only Memory), and collectively controls the projection unit 1. The various processors of the control unit 4 include a general-purpose processor, that is, a CPU (Central Processing Unit) that executes a program to perform various processes, a programmable logic device (PLD) such as an FPGA (Field Programmable Gate Array) whose circuit structure can be changed after manufacture, or an ASIC (Application Specific Integrated Circuit) having a circuit structure specially designed to perform a specific process, and the like.

[0048] More specifically, the structure of these various processors is a circuit in which circuit elements such as semiconductor elements are combined. The control unit 4 of the control unit can be configured by one of the various processors, or can be configured by a combination of two or more processors of the same kind or different kinds (for example, a combination of a plurality of FPGAs or a combination of a CPU and an FPGA).

[0049] The operation reception unit 2 detects an instruction (user instruction) from a user by receiving various operations from the user. The operation reception unit 2 can be a button, a key, a joystick, or the like provided in the control unit 4, or can be a reception unit that receives a signal from a remote controller that performs remote operation of the control unit 4, or the like.

[0050] The communication section 5 is a communication interface that can communicate with the computer 50. The communication section 5 can be a wired communication interface that performs wired communication as shown in FIG. 8, or a wireless communication interface that performs wireless communication. Figure 1

[0051] In addition, the projection section 1, the control section 4, and the operation reception section 2 are realized by one device, for example (see FIG. 9, for example). Figure 4 Figure 5 Alternatively, the projection section 1, the control section 4, and the operation reception section 2 can be different devices that cooperate with each other through communication.

[0052] <Internal structure of the projection section 1> Figure 3 is a schematic view showing an example of the internal structure of the projection section 1. As shown in Figure 3 Figure 2 The projection section 1 of the projection device 10 shown in FIG. 7 is provided with a light source 21, a light modulation section 22, a projection optical system 23, and a control circuit 24. The light source 21 includes a light emitting element such as a laser or an LED (Light Emitting Diode), and emits white light, for example.

[0053] The light modulation section 22 is configured of three liquid crystal panels (light modulation elements) and a dichroic prism, modulates each color light of red, blue, and green separated by a color separation mechanism not shown from the light emitted from the light source 21 according to image information, and emits various color images. The dichroic prism mixes the various color images emitted from the three liquid crystal panels and emits them in the same direction. A red, blue, and green filter can be mounted on each of the three liquid crystal panels, and each liquid crystal panel modulates the white light emitted from the light source 21 and emits various color images.

[0054] The projection optical system 23 is a device for receiving light from the light source 21 and the light modulation section 22, and is configured of a relay optical system including at least one lens, for example. Light passing through the projection optical system 23 is projected onto the projection target object 6.

[0055] In the projection target object 6, the area irradiated with light that has passed through the entire range of the light modulation section 22 becomes a projectable range in which projection by the projection section 1 is possible. The area irradiated with light that has actually passed through the light modulation section 22 in the projectable range becomes the projection range (projection range 11a or projection range 11b) of the projection section 1. For example, by controlling the size, position, and shape of the light-transmitting area in the light modulation section 22, the size, position, and shape of the projection range of the projection section 1 are changed in the projectable range.

[0056] ​​​The control circuit 24 causes an image based on display data input from the control section 4 to be projected onto the projection target 6 by controlling the light source 21, the light modulation section 22, and the projection optical system 23 in accordance with the display data. The display data input to the control circuit 24 is composed of three parts, red display data, blue display data, and green display data.

[0057] Further, the control circuit 24 changes the projection optical system 23 in accordance with a command input from the control section 4, thereby performing enlargement or reduction of the projection range of the projection section 1. Further, the control section 4 can change the projection optical system 23 in accordance with an operation from a user received by the operation receiving section 2, thereby causing the projection range of the projection section 1 to move.

[0058] Further, the projection device 10 is provided with a displacement mechanism that mechanically or optically moves the projection range of the projection section 1 while maintaining the image circle of the projection optical system 23. The image circle of the projection optical system 23 is a region through which projection light incident on the projection optical system 23 can still appropriately pass from the viewpoint of light intensity attenuation, color separation, peripheral curvature, and the like.

[0059] The displacement mechanism is implemented by at least either an optical system displacement mechanism that performs optical system displacement, or an electronic displacement mechanism that performs electronic displacement.

[0060] The optical system displacement mechanism is, for example, a mechanism that moves the projection optical system 23 in a direction perpendicular to the optical axis (for example, refer to Figure 5 、 Figure 29 ), or a mechanism that moves the light modulation section 22 in a direction perpendicular to the optical axis, instead of moving the projection optical system 23. Further, the optical system displacement mechanism can combine movement of the projection optical system 23 and movement of the light modulation section 22.

[0061] The electronic displacement mechanism is a mechanism that performs displacement of a pseudo projection range by changing a light transmission range in the light modulation section 22.

[0062] Further, the projection device 10 can also be provided with a projection direction changing mechanism that moves the projection range together with the image circle of the projection optical system 23. The projection direction changing mechanism is a mechanism that changes the projection direction of the projection section 1 by changing the direction of the projection section 1 using mechanical rotation (for example, refer to Figure 29 ).

[0063] Mechanical Structure of Projection Device 10 Figure 4 is a schematic view showing the external structure of the projection device 10. Figure 5 is a cross-sectional schematic view of the optical unit 106 of the projection device 10 shown in Figure 4 . Figure 5The text shows the path along from... Figure 4 The cross-section of the surface of the light path emitted by the main body 101 shown.

[0064] like Figure 4 As shown, the projection device 10 includes a main body 101 and an optical unit 106 protruding from the main body 101. Figure 4 In the structure shown, the operation receiving unit 2, the control unit 4, the light source 21, the light modulation unit 22, the control circuit 24, and the communication unit 5 in the projection unit 1 are all provided in the main body 101. The projection optical system 23 in the projection unit 1 is provided in the optical unit 106.

[0065] The optical unit 106 includes a first component 102 supported on the main body 101. The optical unit 106 can be configured to be detachable from the main body 101 (in other words, a replaceable structure).

[0066] like Figure 5 As shown, the main body 101 has a frame 15 on the part connected to the optical unit 106, on which an opening 15a for allowing light to pass through is formed.

[0067] like Figure 4 As shown, a light source 21 and a light modulation unit 12 are disposed inside the frame 15 of the main body 101. The light modulation unit 12 includes a light modulation section 22 (see reference) that spatially modulates the light emitted from the light source 21 according to the input image data to generate an image. Figure 3 Light emitted from light source 21 is incident on light modulation unit 22 of light modulation unit 12, and is emitted after being spatially modulated by light modulation unit 22.

[0068] like Figure 5 As shown, an image formed by light spatially modulated by the light modulation unit 12 is incident on the optical unit 106 through the opening 15a of the frame 15 and projected onto the projection object 6, so that the observer can see the image G1.

[0069] The optical unit 106 includes: a first component 102 having a hollow portion 2A connected to the interior of the main body 101; a first optical system 121 disposed in the hollow portion 2A; a lens 34; and a first displacement mechanism 105.

[0070] The first component 102 is a component with a rectangular cross-sectional shape, and openings 2a and 2b are formed on mutually parallel surfaces. The first component 102 is supported by the main body 101 with opening 2a positioned opposite to opening 15a. Light emitted from the light modulation section 22 of the light modulation unit 12 in the main body 101 enters the hollow portion 2A of the first component 102 through openings 15a and 2a.

[0071] The incident direction of light from the main body 101 to the hollow part 2A is recorded as direction X1, the opposite direction of direction X1 is recorded as direction X2, and directions X1 and X2 are collectively recorded as direction X. Furthermore, in Figure 5 In this diagram, the direction from the front to the back of the paper and the opposite direction are recorded as direction Z. Within direction Z, the direction from the front to the back of the paper is recorded as direction Z1, and the direction from the back to the front of the paper is recorded as direction Z2.

[0072] Furthermore, the direction perpendicular to both direction X and direction Z is recorded as direction Y. Within direction Y, [the following will be included / distributed]. Figure 5 The upward direction is recorded as direction Y1, and will be... Figure 5 The downward direction is recorded as direction Y2. Figure 5 In the example, the projection device 10 is configured such that direction Y2 is the vertical direction.

[0073] exist Figure 5 In the example, Figure 3 The projection optical system 23 shown consists of a first optical system 121 and a lens 34. Figure 5 The optical axis K of the projection optical system 23 is shown in the diagram. The first optical system 121 and the lens 34 are arranged sequentially along the optical axis K from the light modulation unit 22 side.

[0074] The first optical system 121 includes at least one lens and guides light propagating in the direction X1 from the main body 101 onto the first component 102 to the lens 34.

[0075] Lens 34 is disposed at this end in a manner that closes the opening 2b formed at the X1 side end of the first component 102. Lens 34 projects light incident from the first optical system 121 onto the projection object 6.

[0076] The first displacement mechanism 105 is used to move the optical axis K of the projection optical system (in other words, the optical unit 106) in a direction perpendicular to its optical axis K. Figure 5 The mechanism is a mechanism for moving in the direction Y. Specifically, the first displacement mechanism 105 is configured to change the position of the first component 102 relative to the main body 101 in the direction Y. In addition to moving the first component 102 manually, the first displacement mechanism 105 can also move the first component 102 electrically.

[0077] Figure 5 The diagram shows the state in which the first component 102 moves to its maximum extent in the direction Y1 via the first displacement mechanism 105. From this... Figure 5From the state shown, the first component 102 moves along the direction Y2 via the first displacement mechanism 105, thereby changing the relative position of the center of the image formed by the light modulation unit 22 (in other words, the center of the display surface) with the optical axis K, thereby enabling the image G1 projected onto the projection object 6 to be displaced (parallel moved) along the direction Y2.

[0078] Furthermore, the first displacement mechanism 105 can be a mechanism that moves the light modulation unit 22 along the Y direction, rather than a mechanism that moves the optical unit 106 along the Y direction. Even in this case, it is still possible to move the image G1 projected onto the projection object 6 along the Y direction.

[0079] <Computer Hardware Architecture> Figure 6 This is a diagram illustrating an example of the hardware structure of computer 50. (As shown...) Figure 5 As shown, Figure 1 The computer 50 shown includes a processor 51, a memory 52, a communication interface 53, and a user interface 54. The processor 51, memory 52, communication interface 53, and user interface 54 are connected, for example, via a bus 59.

[0080] Processor 51 is a circuit that performs signal processing; for example, it is the CPU that controls the overall computer 50. Alternatively, processor 51 can also be implemented using other digital circuits such as FPGA or DSP (Digital Signal Processor). Furthermore, processor 51 can be implemented by combining multiple digital circuits.

[0081] The memory 52 includes, for example, main memory and auxiliary memory. The main memory is, for example, RAM (Random Access Memory). The main memory is used as the working area of ​​the processor 51.

[0082] Auxiliary storage is, for example, non-volatile storage such as a hard disk, optical disk, or flash memory. Various programs that enable the computer 50 to run are stored in the auxiliary storage. The programs stored in the auxiliary storage are loaded into main memory and executed by the processor 51.

[0083] Furthermore, auxiliary storage may include portable storage devices that can be removed from the computer 50. Portable storage devices include memory cards such as USB (Universal Serial Bus) flash drives or SD (Secure Digital) memory cards, or external hard drives.

[0084] Communication interface 53 is a communication interface used for communication between computer 50 and external devices (such as the first projection device 10a and the second projection device 10b). Communication interface 53 is controlled by processor 51. Communication interface 53 can be a wired communication interface for wired communication, a wireless communication interface for wireless communication, or both.

[0085] The user interface 54 may include, for example, an input device that receives operation input from the user, or an output device that outputs information to the user. The input device may be implemented, for example, through a pointing device (e.g., a mouse), buttons (e.g., a keyboard), or a remote control. The output device may be implemented, for example, through a display or a speaker. Furthermore, the input and output devices may also be implemented through a touch panel. The user interface 54 is controlled by the processor 51.

[0086] <Generation of Lookup Table (LUT) for Color Adjustment> refer to Figures 7 to 11 The generation of the lookup table used for color adjustment is explained.

[0087] Figure 7 This diagram illustrates the state of generating the lookup table for color adjustment. Computer 50 generates a lookup table in advance to adjust the colors between the projections of the first projection device 10a and the second projection device 10b. This lookup table is generated using one of the arbitrarily selected projection devices.

[0088] The selected projection device can be, for example, a projection device that can be ... Figure 1 One of the first projection device 10a or the second projection device 10b described herein may also be a different projection device. However, the first projection device 10a, the second projection device 10b, and the other projection devices are projection devices that have the same or similar projection characteristics. Having the same or similar projection characteristics means, for example, projection devices with the same optical design (e.g., the same model).

[0089] In this example, such as Figure 7 As shown, a lookup table is generated using the first projection device 10a. The location where the lookup table is generated can be the location where the projection system 100 is set, or it can be a location different from the actual site (e.g., a manufacturing plant). The lookup table (LUT) is an example of "adjustment data" in this invention.

[0090] Figure 8 This diagram illustrates an example of the lookup table generation process. First, in order to generate a lookup table for a specified color with color adjustment, the computer 50 creates an image of a test pattern I (r, g, b) of the specified color and sends the created test pattern I (r, g, b) to the first projection device 10a.

[0091] As described later, the structure can be configured to adjust colors for multiple colors (e.g., white, cyan, magenta, etc.), but here we will focus on the case where the adjusted color is white. When the adjusted color is white, the test pattern becomes Test Pattern I (r,g,b=255). White (r,g,b=255) is an example of the "first color" in this invention. Furthermore, when the adjusted color is cyan, it becomes Test Pattern I (r,g,b=0,255,255), and when the adjusted color is magenta, it becomes Test Pattern I (r,g,b=255,0,255).

[0092] Furthermore, the computer 50 changes the color adjustment parameters P (p1, p2, ..., pn) as parameters and sequentially sends test patterns I with different color adjustment parameters P to the first projection device 10a. In this example, the color adjustment parameters P (p1, p2, ..., pn) are parameters that adjust the gain of each color component R, G, and B in the image. Therefore, the gain of R becomes p1, the gain of G becomes p2, the gain of B becomes p3, and the color adjustment parameter P = (p1, p2, p3).

[0093] The color adjustment parameter P is used to adjust (change) the color of the projection. Furthermore, the color adjustment parameter is not limited to the gain values ​​for R, G, and B individually; for example, it can also be the offset values ​​for R, G, and B individually, or a combination of gain and offset values. In addition, the color adjustment parameter can include other parameters such as hue.

[0094] The first projection device 10a projects the test pattern I (r, g, b) that has changed color adjustment parameter P received from the computer 50 onto the projection object 6 in sequence.

[0095] Colorimeter 131 pairs of XYZ values ​​(XYZ) （r,g,b=255） (p1, p2, p3) are measured respectively, and the XYZ values ​​correspond to the white test pattern I by changing the color adjustment parameter P projected from the first projection device 10a.

[0096] Computer 50 sets the XYZ value of the color adjustment parameter P, which represents the maximum brightness (maximum lightness) of white relative to the XYZ values ​​of the white test pattern measured by colorimeter 131, as a reference white. Computer 50 converts the XYZ values ​​of the reference white to values ​​in, for example, the Lab color space 61. L represents lightness, and a and b represent chromaticity. This color space represents relative color values ​​based on the reference white. Computer 50 converts each XYZ value of the color adjustment parameter P, changing it, to values ​​in the Lab color space 61. Lab color space 61 is an example of a "specific color space" in this invention. Alternatively, the "Luv color space" could be used, for example, as a specific color space.

[0097] Computer 50 creates a lookup table 62 representing the relationship between the color adjustment parameter P and its position in the Lab color space 61. Lookup table 62 takes inputs p1, p2, ..., pn and outputs L. * a * b * A multidimensional lookup table. In this example, since the color adjustment parameters P(p1,p2,p3) become the gain values ​​of R, G, and B, the lookup table is three-dimensional.

[0098] Between projection devices (e.g., first projection device 10a and second projection device 10b), the absolute color of the adjusted color (e.g., white) differs. In this invention, projection devices with the same or similar projection characteristics, for a certain color (adjusted color), focus on cases where the relative color change trend caused by the color adjustment parameters of the projection devices is the same, and use a lookup table recording this relative color change to perform color adjustment of the projection devices. The aforementioned projection devices with the same or similar projection characteristics refer to projection devices that have projection characteristics that can be considered to have the same relative color change trend caused by the color adjustment parameters.

[0099] Figure 9 This is a flowchart illustrating the process of generating a lookup table via the processor 51 of the computer 50.

[0100] The processor 51 projects the color-adjusted test pattern I (r, g, b) from the first projection device 10a onto the projection object 6 (step S11). In this example, as described above, the white test pattern I is projected (r, g, b = 255).

[0101] The processor 51 sequentially projects test patterns I (r, g, b) onto multiple combinations of color adjustment parameters P (p1, p2, p3) for white. As mentioned above, p1 is the gain of R, p2 is the gain of G, and p3 is the gain of B.

[0102] The processor 51 sets the combination of the object's color adjustment parameters P in the first projection device 10a and projects the test pattern I (r, g, b) (step S12).

[0103] Next, the processor 51 measures the XYZ values ​​(XYZ values) using the colorimeter 131. （r,g,b=255） Colorimetry is performed on (p1, p2, p3), and the XYZ values ​​correspond to the white test pattern I projected onto the projection object 6 (step S13). In this case, the processor 51 may, for example, issue a prompt such as "Please perform color measurement", or control the colorimeter 131 to perform color measurement.

[0104] Next, the processor 51 obtains the XYZ values ​​(XYZ values) corresponding to the white test pattern I from the colorimeter 131. （r,g,b=255） The colorimetric values ​​of (p1, p2, p3) are obtained (step S14).

[0105] Next, the processor 51 converts the measured values ​​of each XYZ value of the white color adjustment parameter P into values ​​in a specific color space (Lab color space 61 in this example) (step S15).

[0106] Next, processor 51 creates a lookup table for white adjustment that represents the relationship between multiple combinations of color adjustment parameters P and values ​​in the Lab color space 61. （r,g,b=255） (Step S16).

[0107] Figure 10 This is a diagram illustrating an example of color adjustment parameters P (p1, p2, p3). For example... Figure 10 As shown, the color adjustment parameters P(p1, p2, p3) are, for example, parameters used to adjust the gain of R, G, and B respectively, and the output changes continuously in response to the increase or decrease of the parameters. As mentioned above, the gain of R is p1, the gain of G is p2, and the gain of B is p3. Furthermore, in Figure 10 For ease of explanation, the input and output are shown in a linear manner.

[0108] When processor 51 changes the color adjustment parameters P(p1,p2,p3) to measure XYZ values, for example, it measures multiple combinations obtained by changing the R gain value (p1), G gain value (p2), and B gain value (p3) from 1.0 to 0.5 in steps of 0.02. The XYZ value of the reference white mentioned above is the measured value of the color adjustment parameters P(p1,p2,p3) when all R, G, and B gain values ​​are set to 1.0. In addition, although the color adjustment parameters P(p1,p2,p3) are changed in steps of 0.02, the measured values ​​in between can also be calculated by interpolation using nearby measured values.

[0109] Figure 11 This is an example diagram showing a lookup table when the color is adjusted to white. As mentioned above, a lookup table (LUT) is a three-dimensional table that shows the relationship between the color adjustment parameters P (p1, p2, p3) and their positions in the Lab color space.

[0110] The lookup table when the color is adjusted to white is marked as a LUT. 白色 =LUT （255,255,255） Furthermore, the relationship between the color adjustment parameters P(p1,p2,p3) and their positions in the Lab color space is denoted as (L... * ,a * ,b * =LUT （r,g,b） (p1,p2,p3). Therefore, the relationship between the color adjustment parameters P(p1,p2,p3) when the color is adjusted to white and their positions in the Lab color space is expressed as (L * ,a * ,b * =LUT （255,255,255） (R gain, G gain, B gain).

[0111] The gain value of the color adjustment parameters P(p1,p2,p3) in the reference white that reaches maximum brightness is R,G,B gain = 1.0. Therefore, if the position of the reference white in the Lab color space is set to (L... * ,a * ,b * If (100, 0, 0) = (100, 0, 0), then its relation becomes (100, 0, 0) = LUT （255,255,255） (1.0, 1.0, 1.0). Furthermore, this relationship is set as follows: Figure 11 Spatial location 63 in the three-dimensional lookup table shown.

[0112] <Color adjustment of projection devices using lookup tables> refer to Figures 12 to 15 The color adjustment between the projections of the first projection device 10a and the second projection device 10b using a lookup table for color adjustment will be explained.

[0113] Figure 12 This is a flowchart illustrating the color adjustment process using a lookup table by the processor 51 of the computer 50.

[0114] First, the processor 51 projects the color-adjusted test pattern I (r, g, b) from the first projection device 10a onto the projection object 6 (step S21). In this example, the white adjustment lookup table created as described above is used to explain the adjustment of the white between the projections of the first projection device 10a and the second projection device 10b. Therefore, in step S21, the processor 51 causes the first projection device 10a to project the white test pattern I (r, g, b = 255). Furthermore, during the projection process via the first projection device 10a, the processor 51 controls the second projection device 10b to a state where no light is projected.

[0115] Next, the processor 51 causes the colorimeter 131 to measure the XYZ values ​​(XYZ). 白色 PJ1 Colorimetric measurements are performed on (p1, p2, p3), and the XYZ values ​​correspond to the white test pattern I projected onto the projection object 6 (step S22). In this case, the processor 51 may, for example, issue a prompt such as "Please perform color measurement," or control the colorimeter 131 to perform color measurement. Furthermore, the white color measurement value is marked as "XYZ". 白色 The colorimetric values ​​of the first projection device 10a are marked as "XYZ". PJ1 ".

[0116] Next, the processor 51 obtains the XYZ values ​​(XYZ values) corresponding to the white test pattern I from the colorimeter 131. 白色 PJ1 (p1, p2, p3) (Step S23).

[0117] Next, the processor 51 projects the white test pattern I (r,g,b=255) from the second projection device 10b onto the projection target 6 in the same manner as the first projection device 10a (step S24). Additionally, the processor 51 controls the first projection device 10a to a state where it does not project light at this time.

[0118] Next, the processor 51 causes the colorimeter 131 to set the XYZ values ​​(XYZ). 白色 PJ2 Colorimetric measurements are performed on (p1, p2, p3), and the XYZ values ​​correspond to the white test pattern I projected onto the projection object 6 (step S25). Furthermore, the colorimetric values ​​measured by the second projection device 10b are labeled as "XYZ". PJ2 Even in this case, the processor 51 can, for example, issue a prompt such as "Please perform color measurement" or control the colorimeter 131 to perform color measurement.

[0119] Next, the processor 51 obtains the XYZ values ​​(XYZ values) corresponding to the white test pattern I from the colorimeter 131. 白色PJ2 (p1, p2, p3) (Step S26).

[0120] Next, the processor 51 performs the following determination process: determining appropriate color adjustment parameters for matching (approaching) the white of the first projection device 10a and the second projection device 10b (step S27). Figure 13 The flowchart explains this determination process.

[0121] Next, the processor 51 sets the appropriate color adjustment parameters determined in the determination process of step S27 into the adjustment projection device (either the first projection device 10a or the second projection device 10b) determined in the determination process of step S27 (step S28), and ends the color adjustment process.

[0122] Figure 13 This is a flowchart illustrating the process of determining color adjustment parameters performed by processor 51. The process of determining color adjustment parameters is... Figure 12 The processing of step S27 in the process.

[0123] Processor 51 compares the XYZ values ​​of the first projection device 10a, which is used for color measurement in step S22. 白色 PJ1 (p1, p2, p3) and the XYZ of the second projection device 10b that performs color measurement in step S25 白色 PJ2 (p1, p2, p3), the projection device with a larger Y value (brightness) is identified as the color adjustment projection device (Adj), and the projection device with a smaller Y value is identified as the reference projection device (Ref) without color adjustment (step S31).

[0124] Next, the processor 51 will adjust the white color measurement value of the projection device, i.e., XYZ. 白色 Adj Set the base white color and adjust the color measurement values ​​(XYZ) of the projection device accordingly. 白色 Adj ) Determine the values ​​(L) in the Lab color space of the projector. * a * b *白色 Adj ), and based on the colorimetric values ​​(XYZ) of the reference projection device. 白色 Ref ) Calculate the value (L) in the Lab color space of the reference projection device. * a * b *白色 Ref (Step S32). Additionally, the colorimetric values ​​of the adjusted projection device (Adj) are marked as "XYZ". AdjAnd label the values ​​in the Lab color space as "L". * a * b * Adj Furthermore, the colorimetric values ​​of the reference projection device (Ref) are labeled as "XYZ". Ref And label the values ​​in the Lab color space as "L". * a * b * Ref ".

[0125] Next, processor 51 is designed for use in... Figure 9 The lookup table for white adjustment created in step S16 （r,g,b=255） Search for the input white adjustment parameters P(p1,p2,p3) and calculate the value that makes it consistent with the reference projection device L. * a * b *白色 Ref The color adjustment parameter P whose color difference (ΔE) reaches its minimum value. pred (Step S33). P pred It can be obtained from the following equation (1).

[0126] P pred =argmin(p1,p2,p3)(||L * a * b *白色 Ref -LUT 白色 (p1,p2,p3)||) =argmin(p1,p2,p3)(ΔE * ab 白色 (p1, p2, p3) (1) Color adjustment parameter P pred This is to adjust the color measurement values ​​(XYZ) of the projection device. 白色 Adj Its position in the Lab color space is close to the colorimetric value measured by the reference projection device (XYZ). 白色 Ref The color adjustment parameter refers to the position of the color in the Lab color space. The position in the Lab color space (a specific color space) is, for example, L... * a * b * The values ​​of each color adjustment parameter. "Closer" means shortening the distance compared to the distance in the Lab color space before applying the color adjustment parameter. Color adjustment parameter P pred This is an example of the "first color adjustment parameter" in this invention.

[0127] In this embodiment, the lookup table is based on brightness (luminance) in L. * Standardization. Therefore, when generating the lookup table ( Figure 7 The projection distance from the first projection device 10a to the projected object 6 and the distance when the generated lookup table is applied ( Figure 1 The projection distance can be different.

[0128] Figure 14 This is a diagram showing the position of the color adjustment parameters in the Lab color space during the color adjustment parameter determination process.

[0129] like Figure 14 As shown, the processor 51 sets the color measurement value of the first projection device 10a to XYZ. 白色 PJ1 (p1, p2, p3). Furthermore, the processor 51 sets the colorimetric values ​​of the second projection device 10b to XYZ. 白色 PJ2 (p1, p2, p3). Processor 51 compares XYZ. 白色 PJ1 (p1,p2,p3) and XYZ 白色 PJ2 (p1, p2, p3), the projection device with the larger Y value (brightness) is designated as the projection device (Adj) for adjusting the color of test pattern I, and the projection device with the smaller Y value is designated as the reference projection device (Ref) for not adjusting the color of test pattern I. This is equivalent to Figure 13 The processing of step S31 in the process.

[0130] In this example, the XYZ axes of the first projection device 10a are... 白色 PJ1 The Y value of (p1, p2, p3) is set to be greater than the XYZ of the second projection device 10b. 白色 PJ2 The Y values ​​of (p1, p2, p3) are large. Therefore, the processor 51 determines the first projection device 10a as the adjustment projection device (Adj). And, the processor 51 determines the second projection device 10b as the reference projection device (Ref).

[0131] Next, processor 51 adjusts the color measurement settings of the projection device (Adj) to XYZ. 白色 Adj (p1, p2, p3). Furthermore, the processor 51 sets the colorimetric values ​​of the reference projection device (Ref) to XYZ. 白色 Ref (p1, p2, p3).

[0132] Next, the processor 51 adjusts the color measurement values ​​(XYZ) of the projection device.白色 Adj ) Determine the values ​​(L) in the Lab color space of the projector. * a * b *白色 Adj Furthermore, the processor 51 calculates the color values ​​(XYZ) based on the reference projection device. 白色 Ref ) Calculate the value (L) in the Lab color space of the reference projection device. * a * b *白色 Ref At this point, the colorimetric value (XYZ) of the white color of the projection device will be adjusted. 白色 Adj Set the base white. Therefore, adjust the value (L) in the Lab color space of the projection device. * a * b *白色 Adj This becomes (100,0,0) in the Lab color space. This is equivalent to... Figure 13 The processing of step S32 in the process.

[0133] Based on XYZ 白色 PJ1 The brightness ratio of (p1, p2, p3) is based on XYZ. 白色 PJ2 (p1, p2, p3) have higher brightness. Brightness refers to "L". * "The L based on colorimetric values ​​in the first projection device 10a and the second projection device 10b" * The higher device becomes the adjustment projection device, based on the L color measurement value. * The lower-profile device becomes the reference projection device. The colorimetric values ​​(XYZ) of the first projection device 10a... 白色 PJ1 This is an example of the "first colorimetric value" of the present invention. The colorimetric value (XYZ) of the second projection device 10b is... 白色 PJ2 () is an example of the "second colorimetric value" of the present invention.

[0134] like Figure 14 As shown, in the Lab color space 61, the L value of the projection device (first projection device 10a) is adjusted. * a * b *白色 Adj The value is determined as spatial position 71, L of the reference projection device (second projection device 10b). * a * b *白色 Ref The value is determined to be spatial location 72. Spatial location 71 is L. *a * b *白色 Adj Value = (100, 0, 0). Then, these L... * a * b *白色 Adj The spatial location of the value 71 and L * a * b *白色 Ref The closer the spatial positions 72 of the values ​​are, the closer the colors of the projections from the first projection device 10a and the second projection device 10b will be.

[0135] Figure 15 This is a diagram illustrating the process of determining color adjustment parameters during the color adjustment parameter determination process. For example... Figure 15 As shown, the processor 51 uses a lookup table for white adjustment. （r,g,b=255） 62 For example, perform a full search for the white adjustment parameters P(p1,p2,p3) as in search path 64.

[0136] Processor 51 determines the color adjustment parameter P based on the color difference. pred 65, the color difference is the color measurement value (XYZ) obtained by adjusting the projection device to apply white to the projection. 白色 Adj The position of ) in the Lab color space 61 and the colorimetric value (XYZ) obtained by projecting white through a reference projection device. 白色 Ref The difference in position in the Lab color space 61.

[0137] Processor 51 in lookup table （r,g,b=255） Among the 62 color adjustment parameters, the one with the smallest color difference is determined as color adjustment parameter P. pred 65. Specifically, processor 51 determines the adjustment of the L of the projection device. * a * b *白色 Adj The position of the value and the L of the reference projection device * a * b *白色 Ref The color adjustment parameter P with the smallest distance between the positions of the values pred 65.

[0138] Processor 51 sets the determined color adjustment parameter P in the adjustment projection device (first projection device 10a). pred 65, and project the test pattern I. If the XYZ values ​​corresponding to the test pattern I are... （r,g,b=255） If the value is converted to a value in the Lab color space 61, then the L value of the first projection device 10a...* a * b *白色 PJ1 The value's location is determined to be spatial location 66.

[0139] As described above, the computer 50 of this embodiment uses a lookup table pre-created based on information representing the relationship between the color adjustment parameter P and its position in the Lab color space, and the color measurement values ​​(XYZ) of the first projection device 10a. 白色 PJ1 ) and the colorimetric values ​​(XYZ) of the second projection device 10b 白色 PJ2 Determine the color adjustment parameter P. pred To obtain higher colorimetric values ​​(XYZ) for greater brightness 白色 PJ1 Its position in the Lab color space is close to the lower brightness colorimetric value (XYZ). 白色 PJ2 The position of the color in the Lab color space. Based on this structure, color adjustment is performed using a lookup table that records the relative color changes caused by the color adjustment parameters of the projection device 10, thus enabling accurate color adjustment in a short time.

[0140] refer to Figure 16 and Figure 17 A modified example of color adjustment between the projections of the first projection device 10a and the second projection device 10b using a lookup table for color adjustment will be described.

[0141] Figure 16 This is a flowchart illustrating a modified example of color adjustment processing using a lookup table by processor 51. In the above... Figure 12 In the color adjustment process described earlier, the case of adjusting only white was explained. However, due to the internal structure of the projection device, such as the combination of the light source or color wheel, color generation is difficult to control, resulting in colors that are prone to deviation, or specific representative colors used in each image. Therefore, it is desirable to adjust colors other than white. Thus, in this modified example, the case of adjusting multiple colors is explained.

[0142] First, the processor 51 adjusts colors other than white, in accordance with the above. Figures 7 to 11 Similarly, a lookup table for color adjustment is created, representing the relationship between multiple combinations of the color adjustment parameter P and its values ​​in the Lab color space 61. （r,g,b） For example, when adjusting the color to cyan, it involves a lookup table. （r,g,b=0,255,255） When the color is adjusted to magenta, it is a lookup table. （r,g,b=255,0,255） .

[0143] Next, as Figure 16 As shown, processor 51 performs steps S41 to S46 for each of the multiple adjustment colors. The multiple adjustment colors may include, for example, cyan or magenta in addition to white. Furthermore, since the processing of steps S41 to S46 is related to... Figure 12 The processes described in steps S21 to S26 are the same, so the description is omitted.

[0144] Next, based on the information obtained in steps S41 to S46, the processor 51 performs the following determination process: determining appropriate color adjustment parameters for making the colors of the first projection device 10a and the second projection device 10b match (approach) (step S47). Figure 17 The flowchart explains this determination process.

[0145] Next, the processor 51 sets the appropriate color adjustment parameters determined in the determination process of step S47 into the adjustment projection device (either the first projection device 10a or the second projection device 10b) determined in the determination process of step S47 as well (step S48).

[0146] Figure 17 This is a flowchart illustrating a modified example of the color adjustment parameter determination process performed by processor 51. The color adjustment parameter determination process is... Figure 16 The processing of step S47 in the process.

[0147] Processor 51 compares the XYZ values ​​of the first projection device 10a, which is used for color measurement in step S42. 白色 PJ1 (p1, p2, p3) and the XYZ of the second projection device 10b that performs color measurement in step S45 白色 PJ2 (p1, p2, p3), the projection device with a larger Y value (brightness) is identified as the color adjustment projection device (Adj), and the projection device with a smaller Y value is identified as the reference projection device (Ref) without color adjustment (step S51).

[0148] Next, the processor 51 will adjust the colorimetric value of white on the projection device, i.e., XYZ. 白色 Adj Set the base white as the color, and in each color adjustment, adjust the color measurement values ​​(XYZ) of the projector according to the color measurement values. 调整颜色 Adj ) Determine the values ​​(L) in the Lab color space of the projector. * a * b *调整颜色 Adj), and based on the colorimetric values ​​(XYZ) of the reference projection device. 调整颜色 Ref ) Calculate the value (L) in the Lab color space of the reference projection device. * a * b *调整颜色 Ref (Step S52). Additionally, the colorimetric values ​​for each adjusted color are labeled "XYZ". 调整颜色 The values ​​in the Lab color space for each adjusted color are labeled "L". * a * b *调整颜色 ".

[0149] Next, the processor 51 adjusts the value (L) of the projection device in the Lab color space of the color adjustment obtained in step S52. * a * b *调整颜色 Adj ), will adjust the L in the lookup table for color adjustment * a * b *调整颜色 Adj The offset value, aligned to the base point of the value, is reflected in the Lab color space of the reference projection device (L). * a * b *调整颜色 Ref (Step S53).

[0150] When the color is adjusted to white, due to L * a * b *白色 Adj The base point for the value is (100,0,0), therefore no special processing is needed for aligning the base point. However, when making other color adjustments (other than white), the L value of the projection device needs to be adjusted. * a * b *调整颜色 Adj The base point of the value and the lookup table for adjusting the color are expected to be L. * a * b *调整颜色 Adj The baseline value may be slightly deviated due to measurement errors, etc.

[0151] The processor 51 calculates the deviation as an offset value and reflects the offset value in the reference projection device L, which is compared with the lookup table. * a * b *调整颜色 RefThe value is used to perform correction processing to reduce the deviation of the base point. The Offset value and L, which reflects the Offset value, are then used. * a * b *调整颜色 Ref+Offset The value is obtained by the following equation (2).

[0152] Offset value =LUT 调整颜色 (P base point) - L * a * b *调整颜色 Adj L * a * b *调整颜色 Ref+Offset =L * a * b *调整颜色 Ref +Offset value (2) The P-base point refers to, for example, the base point when the R, G, and B gain values ​​are 1.0. The output values ​​of the lookup table can also be corrected, but if applied to the entire lookup table, the processing load will increase; therefore, the L-base point of the reference projection device... * a * b *调整颜色 Ref The value is corrected.

[0153] Next, the processor 51 uses the lookup table for color adjustment in each color adjustment. （r,g,b） The system searches for color adjustment parameters P(p1, p2, p3) in each input color adjustment and calculates the L of the reference projection device that reflects the offset value of each color adjustment. * a * b *调整颜色 Ref+Offset The color adjustment parameter P reaches its minimum value when the sum of color differences is minimized. pred (Step S54). P pred It can be obtained from the following equation (3).

[0154] P pred =argmin(p1,p2,p3)(Σ 调整颜色 ||L * a * b *调整颜色 Ref+Offset -LUT 调整颜色 (p1,p2,p3)||) =argmin(p1,p2,p3)(Σ 调整颜色ΔE * ab 调整颜色 (p1, p2, p3) (3) Specifically, in step S54, the processor 51 uses a lookup table for adjusting the white color. （r,g,b=255） Lookup table for adjusting colors （r,g,b） Colorimetric values ​​(XYZ) 白色 PJ1 ), colorimetric values ​​(XYZ) 白色 PJ2 ), colorimetric values ​​(XYZ) 调整颜色 PJ1 ) and colorimetric values ​​(XYZ) 调整颜色 PJ2 To determine the color adjustment parameter P pred .

[0155] Processor 51 calculates the first color difference, which is the color measurement value (XYZ) obtained by adjusting the projection device to apply white to the projection. 白色 Adj The position of ) in the Lab color space 61 and the colorimetric value (XYZ) obtained by projecting white through a reference projection device. 白色 Ref The difference in position of the colors in the Lab color space 61. Furthermore, the processor 51 calculates a second color difference, which is a colorimetric value (XYZ) obtained by adjusting the color in the projection using a projection device. 调整颜色 Adj The position of the color in the Lab color space 61 and the color measurement value (XYZ) obtained by projecting and adjusting the color through a reference projection device. 调整颜色 Ref The difference in position in the Lab color space 61.

[0156] Then, the processor 51 determines the color adjustment parameter P based on the sum of the first color difference and the second color difference. pred The processor 51 uses lookup tables for various color adjustments (e.g., white, cyan, magenta, etc.). （r,g,b） In the color adjustment parameters, the color adjustment parameter that minimizes the sum of the first color difference and the second color difference is determined as the color adjustment parameter P. pred The colorimetric values ​​(XYZ) of the first projection device 10a 调整颜色 PJ1 This is an example of the "third colorimetric value" of the present invention. The colorimetric value (XYZ) of the second projection device 10b is... 调整颜色 PJ2 ( ) is an example of the "fourth colorimetric value" of the present invention. XYZ 调整颜色 Adjusting colors in the settings, such as cyan, magenta, etc.

[0157] Furthermore, when adding the first color difference and the second color difference, the processor 51 can perform a weighted summation of the color differences. That is, when determining the color adjustment parameter P, the processor 51... pred For example, the priority of colors in the projected image content can be considered, and each adjusted color can be weighted to determine the priority.

[0158] As described above, even when multiple colors are used for adjustment, accurate color adjustment can be performed in a short time by using a lookup table that records the relative color changes caused by the color adjustment parameters of the projection device 10 for each adjusted color.

[0159] <Adjusting the settings of the projection device (Adj) and the reference projection device (Ref)> Figure 18 This diagram illustrates an example of setting a projection device with a larger Y-value (brightness) as an adjustable projection device (Adj). When a projection device with a larger Y-value is set as an adjustable projection device, such as... Figure 18 As shown, in the Lab color space 61, the L of the projection device is adjusted. * a * b *白色 Adj The value is determined, for example, to be spatial location 71.

[0160] Then, L, as the reference projection device for the projection device with a smaller Y value * a * b *白色 Ref For example, the value is determined as spatial position 72. Here, if the XYZ value of the white of the projection device is set to the reference white, then spatial position 71 becomes L. * a * b *白色 Adj Value = (100, 0, 0).

[0161] In this case, the Y value of the adjustment projection device (Adj) is reduced to align the Y value of the adjustment projection device (Adj) with the Y value of the reference projection device (Ref). At this time, the L value of the adjustment projection device... * a * b *白色 Adj The value's position (spatial position 71) is closest to the reference projection device L. * a * b *白色 Ref The color adjustment parameter P for the value's position (spatial position 72) (set to minimum color difference) pred Determine the lookup table （r,g,b=255）Color adjustment parameter 82 (asterisk) in 81.

[0162] Then, by applying the determined color adjustment parameter 82 to the adjustment projection device (Adj), the display L of the projection device is adjusted. * a * b *白色 Adj The position of the value becomes the L closest to the reference projection device. * a * b *白色 Ref The position of the value (spatial position 72) (minimum color difference).

[0163] Figure 19 This diagram illustrates an example of setting a projection device with a smaller Y-value (brightness) as an adjustable projection device (Adj). When a projection device with a smaller Y-value is set as an adjustable projection device, such as... Figure 19 As shown, in the Lab color space 61, the L of the projection device is adjusted. * a * b *白色 Adj The value is determined, for example, to be spatial location 72.

[0164] Then, the projection device with a larger Y value, i.e., the reference projection device, L... * a * b *白色 Ref For example, the value is determined as spatial position 71. Here, if the XYZ value of the white of the projection device is set to the reference white, then spatial position 72 becomes L. * a * b *白色 Adj Value = (100, 0, 0).

[0165] In this case, the adjustment projection device (Adj) with a smaller Y value is adjusted to make it closer to the reference projection device (Ref) with a larger Y value. * a * b *白色 Ref The position of the value (spatial position 71) is adjusted. At this time, as the L of the adjustment projection device... * a * b *白色 Adj The value's position (spatial position 72) is closest to the reference projection device L. * a * b *白色 Ref The color adjustment parameter P for the value's position (spatial position 71) (set as minimum color difference) pred Determine the lookup table（r,g,b=255） Color adjustment parameter 83 (asterisk) in 81.

[0166] Then, by applying the determined color adjustment parameter 83 to the adjustment projection device (Adj), the display L of the projection device is adjusted. * a * b *白色 Adj The position of the value becomes the L closest to the reference projection device. * a * b *白色 Ref The position of the value (spatial position 71) (minimum color difference).

[0167] In color adjustment among multiple projection devices 10, it is sometimes undesirable to reduce (darken) the brightness of a projection device with higher brightness to match the brightness of a projection device with lower brightness. Furthermore, sometimes the user determines the projection device as the adjustment reference based on the configuration of the multiple projection devices. Therefore, by allowing the user to select both the projection device used for adjustment and the projection device used as the reference projection device, color adjustment of the projection devices can be performed to match the user's intentions.

[0168] <Using chromaticity difference to determine color adjustment parameters> Figure 20 This diagram illustrates an example of determining color adjustment parameters based on chromaticity difference. In the example above, the input parameter is searched in a lookup table, and the value is determined to be consistent with the L value of the reference projection device. * a * b * Color difference of value (ΔE) * ab The color adjustment parameter P reaches its minimum value. pred The situation has been explained, but it is not limited to this. For example, it is also possible to determine the chromaticity difference (Δa). * b * The color adjustment parameter P reaches its minimum value. pred .

[0169] For example, such as Figure 20 As shown, when the projection device with a smaller Y value is set as the adjustment projection device (Adj), the L value of the adjustment projection device is determined. * a * b *白色 Adj The value's position (spatial position 72) is closest to the reference projection device L. * a * b *白色 Ref The color adjustment parameter P is set to the position of the value (spatial position 71) (as the minimum chromaticity difference). pred .

[0170] In this case, the color adjustment parameter P is set as the minimum chromaticity difference. pred Determine the lookup table （r,g,b=255） Color adjustment parameter 84 (asterisk) in 81. Then, by applying the determined color adjustment parameter 84 to the adjustment projection device (Adj), the display L of the projection device is adjusted. * a * b *白色 Adj The position of the value becomes the L closest to the reference projection device. * a * b *白色 Ref The position of the value (spatial position 71) (minimum chromaticity difference).

[0171] As described above, by determining the color adjustment parameter P pred Chromaticity difference (Δa) is allowed at this time. * b * This allows for further color adjustments to the projection device to better suit the user's intent.

[0172] <Correction of colorimetric values ​​in the presence of stray light> refer to Figure 21 and Figure 22 The correction of color measurement values ​​when stray light is present during color adjustment of the first projection device 10a and the second projection device 10b is explained. Figure 21 This diagram illustrates an example of color adjustment in the presence of stray light. Figure 22 This is a diagram illustrating an example of colorimetric measurement of stray light in an environment where only stray light is present.

[0173] exist Figure 7 The generation of the lookup table for color adjustment described herein is based on the assumption that it is generated under conditions of no stray light during image color measurement. Therefore, in Figure 1 and Figure 12 The color adjustment process using a lookup table, as described above, also requires color adjustment to be performed in an environment free of stray light. However, in the actual setup location of the projection system 100, for example... Figure 21 As shown, due to the presence of work lighting 91, it is sometimes difficult to reproduce an environment without stray light during color adjustment.

[0174] Therefore, in this case, such as Figure 22 As shown, stray light colorimetric values ​​were measured in a pre-construction environment with only working illumination 91 (stray light). Then, in Figure 12When obtaining color measurement values ​​in steps S23 and S26 of the color adjustment process, the stray light color measurement value is subtracted from the color measurement value of the colorimeter 131, and then a lookup table is used for color adjustment processing.

[0175] Therefore, when the first projection device 10a and the second projection device 10b are performing color adjustment, the color measurement value (XYZ) of the first projection device 10a is... 白色 PJ1 The value is obtained by subtracting the colorimetric value of the first projection device 10a in its non-projection state from the colorimetric value of light projected by the first projection device 10a, for example, in a white light projection. Furthermore, the colorimetric value (XYZ) of the second projection device 10b... 白色 PJ2 The value is obtained by subtracting the colorimetric value of the second projection device 10b in a non-projection state from the colorimetric value of light projected by the second projection device 10b, for example, in white light. The non-projection state refers to, for example, an environment in which the first projection device 10a and the second projection device 10b are not projecting, but are only illuminated by the working lighting 91 (stray light).

[0176] As described above, in the color adjustment of the projection device 10, since the influence of stray light during color measurement can be eliminated, more accurate color adjustment can be performed.

[0177] <Guide to Color Measurement Location> refer to Figures 23 to 25 The instructions explain the location for measuring color values ​​when adjusting the color of the projection device 10. Figure 23 This diagram illustrates an example of an unstable colorimetric position during colorimetric measurement. Figure 24 This is a diagram showing an example of a guide line 92 used to guide the colorimetric position. Figure 25 It is shown Figure 24 The diagram shows the state where the guide line 92 has disappeared.

[0178] When color adjustment is performed on the first projection device 10a and the second projection device 10b, in order to obtain accurate colorimetric values ​​in each projection device, it is preferable not to change the color measurement position in each projection range 11a, 11b during color measurement. Furthermore, when color measurement is performed on multiple adjusted colors, it is preferable to set the measurement position to the same position among the adjusted colors.

[0179] In this case, the processor 51 acquires the colorimetric values ​​(XYZ) of the first projection device 10a. 白色 PJ1When the light is projected from the first projection device 10a, an image of a guide line 92 used to guide the position of the colorimeter 131 is projected, and the colorimeter 131 measures the color of the light projected from the first projection device 10a. Furthermore, the processor 51 acquires the colorimetric values ​​(XYZ) from the second projection device 10b. 白色 PJ2 When the light is projected from the second projection device 10b, an image of a guide line 92 used to guide the position of the colorimeter 131 is projected, and the colorimeter 131 measures the color of the light projected from the second projection device 10b.

[0180] For example, such as Figure 23 As shown, when measuring the color of a test pattern (e.g., a white pattern) projected from the first projection device 10a onto the projection object 6 within a projection range 11a, if the position of the colorimeter 131 held by the user is unstable due to shaking, the measured color value may not be accurately measured. Therefore, as Figure 24 As shown, an image of a guide line 92, including a crosshair, used to guide the colorimetric position, is projected together with an image of the test pattern onto the projection area 11a. Thus, the user can perform colorimetric measurements, for example, by aligning the colorimeter 131 with the guide line 92.

[0181] However, if colorimetric measurements are performed with the guide line 92 visible, the measured colorimetric value will include the color component of the guide line 92. Therefore, as... Figure 25 As shown, an image displaying only the test pattern and not the guide line 92 is projected, and the image is switched between displaying the guide line 92 and an image displaying the guide line 92 at predetermined intervals. Figure 24 (Image).

[0182] Therefore, the user can obtain accurate colorimetric values ​​by performing color measurements when the guide line 92 is not displayed. Furthermore, while this example describes the case of the first projection device 10a, the same principle applies to the second projection device 10b.

[0183] <Example of a variation of a guide line> Figure 26 This is a diagram showing a variation of the guide line used to guide the colorimetric measurement position. For example... Figure 26 As shown, regarding the guide line 93 of the modified example, in the cross-shaped guide line, the position where the sensor of the colorimeter 131 should be aligned is, for example, displayed as a white circle.

[0184] exist Figure 24In the guide line 92 shown, a crosshair intersection is displayed at the position where the sensor of the colorimeter 131 should be aligned, while in the modified example, the guide line 93 is displayed as a white circle without any markings at the position where the sensor of the colorimeter 131 should be aligned. Based on the modified example's guide line 93, accurate colorimetric values ​​can be obtained when measuring the adjusted color without switching the display and hiding of the guide line 93.

[0185] Furthermore, the shape of the guide line is not limited to the guide line 93 that is a white circle displayed at the position where the sensor of the colorimeter 131 should be aligned. As long as the user can identify the position where the sensor of the colorimeter 131 should be aligned and that position is a white image, it is acceptable.

[0186] <Projection range of the image during color measurement> refer to Figure 27 The projection range of the color measurement image when the projection device 10 is used for color adjustment is explained. Figure 27 This is a diagram illustrating an example of the projection range of an image during color measurement.

[0187] In the color adjustment of the first projection device 10a and the second projection device 10b described above, for example, as Figure 1 As shown, the test pattern (color measurement image) is projected from the first projection device 10a and the second projection device 10b onto the projection object 6 and is projected onto the entire projection range 11a and 11b, and its color measurement value is measured.

[0188] However, when the operation is performed in a small, enclosed space, light from the first projection device 10a and the second projection device 10b may be reflected onto walls, floors, ceilings, etc., and this reflected light may enter the colorimeter 131, resulting in inaccurate colorimetric measurements. Furthermore, when the operator brings the colorimeter 131 close to the projection surface (screen) of the object 6 for color measurement, the clothing worn by the user may affect the reflection of light.

[0189] In this case, for example, when instructing the first projection device 10a to project the white test pattern, the processor 51 causes the first projection device 10a to project onto a portion of the projection range 11a. Furthermore, for example, when instructing the second projection device 10b to project the white test pattern, the processor 51 causes the second projection device 10b to project onto a portion of the projection range 11b.

[0190] Specifically, such as Figure 27As shown, when measuring color values ​​using the first projection device 10a, a portion 94 of the projection range 11a is narrowed to project a white test pattern, and the sensor of the colorimeter 131 is aligned with this range to perform color measurement. This suppresses the effects of light reflection from walls, floors, ceilings, etc., thereby enabling accurate measurement of color values.

[0191] Furthermore, in this example, the process of color adjustment for the first projection device 10a and the second projection device 10b has been described, but it is not limited to this. For example, the same applies when color measurement is performed when generating a lookup table for color adjustment.

[0192] <Re-testing after color adjustment> The processor 51 transmits the previously determined color adjustment parameters P through the first projection device 10a. pred1 Applicable to a projection state, for example, instructing the first projection device 10a to project in white, and acquiring the applicable colorimetric values ​​(XYZ) of the light projected from the first projection device 10a. 白色 PJ1 ).

[0193] Processor 51, based on applicable colorimetric values ​​(XYZ) 白色 PJ1 In the Lab color space, L * a * b *白色 Adj2 The value's position is based on the lookup table used for white adjustment and the previous color adjustment parameter P. pred1 LUTs in Lab color space 白色 (P) Pred1 The difference in position of the value determines the recolor adjustment parameter P applicable to the projection using the first projection device 10a. pred2 .

[0194] The applicable colorimetric values ​​(XYZ) of the first projection device 10a 白色 PJ1 ( ) is an example of the "fifth colorimetric value" of the present invention. L * a * b *白色 Adj2 This is an example of the "position of the fifth colorimetric value in a specific color space" in this invention. LUT 白色 (P) Pred1 This is an example of the present invention's "position of adjustment data for the first color and the adjustment parameter of the first color in a specific color space". The difference refers to the prediction error in the previous color adjustment, including direction and distance in the color space. Color adjustment parameter P pred1These are the color adjustment parameters determined in the previous color adjustment. Re-adjust color adjustment parameters P pred2 These are the color adjustment parameters determined during the recoloring process after re-measuring.

[0195] Specifically, processor 51 re-measures the color of the adjusted projection device (Adj) and calculates L based on the reference white before adjustment. * a * b *白色 Adj2 and LUT 白色 (P) Pred1 The prediction error. Processor 51 readjusts the color adjustment parameter P. pred2 In the calculation, the prediction error is added, for example, to... Figure 13 In step S33, the "LUT" of the above formula (1) 白色 (p1, p2, p3)”. For example, if the prediction error is set to PredErr1 白色 Then P pred2 It can be obtained from the following equation (4).

[0196] PredErr1 白色 =L * a * b *白色 Adj2 -LUT 白色 (P) pred1 ) P pred2 =argmin(p1,p2,p3)(||L * a * b *白色 Ref1 -LUT 白色 (p1,p2,p3)+PredErr1 白色 ||) (4) The color adjustment parameter P predicted in the previous setting is used to adjust the projection device. pred1 Then, the adjusted projection is re-measured and readjusted based on the deviation of the predicted value, thereby improving the accuracy of color adjustment.

[0197] <Variation Example 1> exist Figure 4 , Figure 5 In the description of the projection device 10, a structure in which the optical axis K is not bent is provided. However, it is also possible to provide a structure in which a reflective component is provided in the optical unit 106 to bend the optical axis K more than once.

[0198] Figure 28 This is a schematic diagram showing other external structures of the projection device 10. Figure 29 yes Figure 28 A cross-sectional schematic diagram of the optical unit 106 of the projection device 10 shown. Figure 28 , Figure 29 In the middle, to and Figure 4 , Figure 5 The same parts shown are given the same symbols and the descriptions are omitted.

[0199] like Figure 28 As shown, the optical unit 106 includes a first component 102 supported on the main body 101, and a second component 103 supported by the first component 102. Alternatively, the first component 102 and the second component 103 may be an integrated component.

[0200] like Figure 29 As shown, in addition to the first component 102, the optical unit 106 also includes: a second component 103 having a hollow portion 3A connected to the hollow portion 2A of the first component 102; a first optical system 121 and a reflective component 122 disposed in the hollow portion 2A; a second optical system 31, a reflective component 32, a third optical system 33 and a lens 34 disposed in the hollow portion 3A; a first displacement mechanism 105; and a projection direction changing mechanism 104.

[0201] exist Figure 28 , Figure 29 In the example, openings 2a and 2b of the first component 102 are formed on mutually perpendicular surfaces. Furthermore, Figure 28 , Figure 29 The projection optical system 23 shown, in addition to Figure 4 , Figure 5 In addition to the first optical system 121 and lens 34 shown, it also comprises a reflective component 122, a second optical system 31, a reflective component 32, and a third optical system 33. Through this projection optical system 23, such as... Figure 29 As shown, the optical axis K is bent twice to form a folded shape. The first optical system 121, the reflecting component 122, the second optical system 31, the reflecting component 32, the third optical system 33, and the lens 34 are arranged sequentially along the optical axis K from the side of the light modulation unit 22.

[0202] The first optical system 121 guides light incident from the main body 101 onto the first component 102, propagating in the direction X1, to the reflecting member 122. The reflecting member 122 reflects the light incident from the first optical system 121 in the direction Y1. The reflecting member 122 is, for example, constructed from a mirror. An opening 2b is formed on the first component 102 in the optical path of the light reflected by the reflecting member 122, and the reflected light enters the hollow portion 3A of the second component 103 through the opening 2b.

[0203] The second component 103 has a roughly L-shaped cross-section, and an opening 3a is formed on the first component 102 opposite to the opening 2b. Light from the main body 101 passing through the opening 2b of the first component 102 enters the hollow portion 3A of the second component 103 through the opening 3a. Furthermore, the cross-sectional shape of either the first component 102 or the second component 103 is arbitrary and not limited to the shape described above.

[0204] The second optical system 31 includes at least one lens and guides light incident from the first component 102 to the reflecting component 32. The reflecting component 32 reflects light incident from the second optical system 31 in the direction X2 and guides it to the third optical system 33. The reflecting component 32 is, for example, constructed of a mirror. The third optical system 33 includes at least one lens and guides light reflected by the reflecting component 32 to the lens 34.

[0205] The lens 34 is disposed at this end in a manner that closes the opening 3c formed at the end of the second component 103 on the X2 side. The lens 34 projects light incident from the third optical system 33 onto the projection object 6.

[0206] Figure 29 The diagram shows the state in which the first component 102 moves to its maximum extent in the direction Y1 via the first displacement mechanism 105. From this... Figure 29 From the state shown, the first component 102 moves along the direction Y2 via the first displacement mechanism 105, thereby changing the relative position of the center of the image formed by the light modulation unit 22 and the optical axis K, thereby enabling the image G1 projected onto the projection object 6 to be displaced along the direction Y1.

[0207] The projection direction changing mechanism 104 is a rotating mechanism that allows the second component 103 to rotate freely relative to the first component 102. Through this projection direction changing mechanism 104, the second component 103 is configured to rotate freely about a rotation axis (specifically, the optical axis K) extending in the Y direction. Furthermore, the projection direction changing mechanism 104 is not limited to any mechanism that allows the optical system to rotate. Figure 29 The configuration positions are shown. Furthermore, the number of rotating mechanisms is not limited to one; multiple mechanisms can be configured.

[0208] <Control Procedure> Furthermore, the control method described in the above embodiments can be implemented by a computer executing a pre-prepared control program. This control program is recorded in a computer-readable storage medium and executed by reading from the storage medium. Moreover, this control program can be provided in the form of storage in a non-volatile storage medium such as a flash memory, or via a network such as the Internet. The computer executing this control program can be included in a control device, or in an electronic device such as a smartphone, tablet terminal, or personal computer capable of communicating with the control device, or in a server device capable of communicating with these control devices and electronic devices.

[0209] The following items are described in this specification. (1) A control device comprising a processor, wherein, The processor described above performs the following processing: Obtain the first colorimetric value of the light of the adjusted color, i.e., the first color, projected from the first projection device; Obtain a second colorimetric value of the light of the first color projected from the second projection device; and Based on the adjustment data for the first color, which indicates the relationship between the color adjustment parameter and its position in a specific color space, the first color measurement value, and the second color measurement value, a first color adjustment parameter is determined so that the position of the first color measurement value in the specific color space is close to the position of the second color measurement value in the specific color space. (2) According to the control device described in (1), wherein, The processor performs the following control: applying the first color adjustment parameter to the projection performed by the first projection device. (3) According to the control device described in (1) or (2), wherein, The color adjustment parameters mentioned above include multiple gain values ​​corresponding to multiple color components. (4) According to any one of (1) to (3), the control device wherein, The color adjustment parameters mentioned above include multiple offset values ​​corresponding to multiple color components. (5) According to any one of (1) to (4), the control device, wherein, The lightness based on the first colorimetric value is higher than the lightness based on the second colorimetric value. (6) According to any one of (1) to (5), the control device, wherein, The processor performs the following processing: determining the first color adjustment parameter based on the first color difference, wherein the first color difference is the difference between the position of the first color measurement value in the specific color space obtained when the first color is applied to the projection by the first projection device and the position of the second color measurement value in the specific color space. (7) According to the control device described in (6), wherein, The processor determines the color adjustment parameter with the smallest first color difference from the color adjustment parameters in the adjustment data as the first color adjustment parameter. (8) According to any one of (1) to (7), the control device, wherein, The processor described above performs the following processing: Acquire a third colorimetric value of light of a second color that is different from the first color projected from the first projection device; Obtain a fourth colorimetric value of the light of the second color projected from the second projection device; and The first color adjustment parameter is determined based on the first color adjustment data, the second color adjustment data indicating the relationship between the color adjustment parameter and its position in the specific color space, the first color measurement value, the second color measurement value, the third color measurement value, and the fourth color measurement value. (9) According to the control device described in (8), wherein, The processor performs the following processing: determining the first color adjustment parameter based on the sum of the first color difference and the second color difference, wherein the first color difference is the difference between the position of the first color measurement value in the specific color space obtained when the first color is applied to the projection by the first projection device and the position of the second color measurement value in the specific color space, and the second color difference is the difference between the position of the third color measurement value in the specific color space and the position of the fourth color measurement value in the specific color space obtained when the second color is applied to the projection by the first projection device. (10) According to the control device described in (9), wherein, The processor determines the color adjustment parameter with the smallest summation result among the color adjustment parameters in the adjustment data as the first color adjustment parameter. (11) According to the control device described in (9) or (10), wherein, The above summation result is the result of a weighted sum of the first color difference and the second color difference. (12) According to any one of (1) to (11), the control device, wherein, The first colorimetric value is obtained by subtracting the colorimetric value of the first projection device in its non-projection state from the colorimetric value of the light projected by the first projection device in the first color. The second colorimetric value is obtained by subtracting the colorimetric value of the second projection device in the non-projection state from the colorimetric value of the light projected by the second projection device in the first color. (13) According to any one of (1) to (12), the control device, wherein, The processor described above performs the following processing: When acquiring the first colorimetric value, an image for guiding the position of the measuring device is projected from the first projection device, and the measuring device measures the color of the light projected from the first projection device. When acquiring the second colorimetric value, an image for guiding the position of the measuring device is projected from the second projection device, and the measuring device measures the color of the light projected from the second projection device. (14) According to any one of (1) to (13), the control device, wherein, The processor described above performs the following processing: When the first color adjustment parameter is applied during projection via the first projection device, the first projection device is instructed to project using the first color, and a fifth colorimetric value of the light projected from the first projection device is acquired. Based on the difference between the position of the fifth color measurement value in the specific color space and the position of the adjustment data based on the first color and the first color adjustment parameter in the specific color space, a second color adjustment parameter applicable to projection performed by the first projection device is determined. (15) According to any one of (1) to (14) the control device, wherein, The processor described above performs the following processing: When the first projection device is instructed to project using the first color, the first projection device projects onto a portion of the projection area. When the second projection device is instructed to project in the first color, the second projection device projects onto a portion of the projection range. (16) According to any one of (1) to (15) the control device, wherein, The first projection device and the second projection device described above have the same or similar projection characteristics. (17) According to the control device described in (16), wherein, The adjustment data for the first color is for the first projection device, the second projection device, or a projection device having the same or similar projection characteristics as the first and second projection devices. In terms of multiple color adjustment parameters, it indicates that the projection is performed with the first color and is created based on the colorimetric value of the projected light. (18) A control method, wherein, The processor in the control device performs the following processing: Obtain the first colorimetric value of the light of the adjusted color, i.e., the first color, projected from the first projection device; Obtain a second colorimetric value of the light of the first color projected from the second projection device; and Based on the adjustment data for the first color, which indicates the relationship between the color adjustment parameter and its position in a specific color space, the first color measurement value, and the second color measurement value, a first color adjustment parameter is determined so that the position of the first color measurement value in the specific color space is close to the position of the second color measurement value in the specific color space. (19) A control program for causing a processor in a control device to perform the following processing: Obtain the first colorimetric value of the light of the adjusted color, i.e., the first color, projected from the first projection device; Obtain a second colorimetric value of the light of the first color projected from the second projection device; and Based on the adjustment data for the first color, which indicates the relationship between the color adjustment parameter and its position in a specific color space, the first color measurement value, and the second color measurement value, a first color adjustment parameter is determined so that the position of the first color measurement value in the specific color space is close to the position of the second color measurement value in the specific color space.

[0229] The various embodiments have been described above, but the present invention is not limited to this example. It is obvious to those skilled in the art that various modifications or alterations can be conceived within the scope described in the technical solution, and these modifications or alterations also fall within the technical scope of the present invention. Furthermore, the constituent elements in the above embodiments can be combined arbitrarily without departing from the spirit of the invention.

[0230] Furthermore, this application is based on Japanese patent application filed on August 28, 2023 (Japanese Patent Application 2023-138035), the contents of which are incorporated herein by reference.

[0231] Symbol Explanation 1-Projection unit, 2-Operation receiving unit, 2A, 3A-Hollow part, 2a, 2b, 3a, 3c, 15a-Opening, 4-Control unit, 4a-Storage medium, 5-Communication unit, 6-Projection object, 8a, 8b-Communication cable, 10-Projection device, 10a-First projection device, 10b-Second projection device, 11a, 11b-Projection range, 12-Light modulation unit, 15-Frame, 21-Light source, 22-Light modulation unit, 23-Projection optical system, 24-Control circuit, 31-Second optical system, 32, 122-Reflective component, 33-Third optical system, 34-Lens, 50-Computer, 51- Processor, 52-Memory, 53-Communication interface, 54-User interface, 59-Bus, 61-Lab color space, 62, 81-Look-up table, 64-Search path, 63, 66, 71, 72-Spatial position, 82-84-Color adjustment parameters, 91-Working illumination, 92, 93-Guide lines, 94-Partial range, 100-Projection system, 101-Main body, 102-First component, 103-Second component, 104-Projection direction changing mechanism, 105-First displacement mechanism, 106-Optical unit, 121-First optical system, 131-Colorimeter, 132-Tripod, G1-Image.

Claims

1. A control device comprising a processor, wherein, The processor performs the following processing: Obtain the first colorimetric value of the light of the adjusted color, i.e., the first color, projected from the first projection device; Acquire a second colorimetric value of the light of the first color projected from the second projection device; and Based on the adjustment data of the first color, which represents the relationship between the color adjustment parameter and its position in a specific color space, the first color measurement value, and the second color measurement value, a first color adjustment parameter is determined such that the position of the first color measurement value in the specific color space is close to the position of the second color measurement value in the specific color space.

2. The control device according to claim 1, wherein, The processor performs the following control: applying the first color adjustment parameter to the projection performed through the first projection device.

3. The control device according to claim 1, wherein, The color adjustment parameters include multiple gain values ​​corresponding to multiple color components.

4. The control device according to claim 1, wherein, The color adjustment parameters include multiple offset values ​​corresponding to multiple color components.

5. The control device according to claim 1, wherein, The brightness based on the first colorimetric value is higher than the brightness based on the second colorimetric value.

6. The control device according to claim 1, wherein, The processor performs the following processing: determining the first color adjustment parameter based on the first color difference, wherein the first color difference is the difference between the position of the first color measurement value in the specific color space and the position of the second color measurement value in the specific color space when the first color is applied to the projection by the first projection device.

7. The control device according to claim 6, wherein, The processor determines the color adjustment parameter with the smallest first color difference from the color adjustment parameters in the adjustment data as the first color adjustment parameter.

8. The control device according to claim 1, wherein, The processor performs the following processing: Acquire a third colorimetric value for light of a second color that is different from the first color projected from the first projection device; Obtain a fourth colorimetric value of the light of the second color projected from the second projection device; and The first color adjustment parameter is determined based on the adjustment data for the first color, the adjustment data for the second color representing the relationship between the color adjustment parameter and its position in the specific color space, the first color measurement value, the second color measurement value, the third color measurement value, and the fourth color measurement value.

9. The control device according to claim 8, wherein, The processor performs the following processing: determining the first color adjustment parameter based on the sum of the first color difference and the second color difference, wherein the first color difference is the difference between the position of the first color measurement value in the specific color space and the position of the second color measurement value in the specific color space when the first color is applied to the projection by the first projection device, and the second color difference is the difference between the position of the third color measurement value in the specific color space and the position of the fourth color measurement value in the specific color space when the second color is applied to the projection by the first projection device.

10. The control device according to claim 9, wherein, The processor determines the color adjustment parameter whose summation result is the smallest among the color adjustment parameters in the adjustment data as the first color adjustment parameter.

11. The control device according to claim 9, wherein, The summation result is the result of a weighted sum of the first color difference and the second color difference.

12. The control device according to claim 1, wherein, The first colorimetric value is obtained by subtracting the colorimetric value of the first projection device in its non-projection state from the colorimetric value of the light projected by the first projection device in the first color. The second colorimetric value is obtained by subtracting the colorimetric value of the second projection device in a non-projection state from the colorimetric value of the light projected by the second projection device in the first color.

13. The control device according to claim 1, wherein, The processor performs the following processing: When acquiring the first colorimetric value, an image used to guide the position of the measuring device is projected from the first projection device, and the measuring device measures the color of the light projected from the first projection device; When acquiring the second colorimetric value, an image for guiding the position of the measuring device is projected from the second projection device, and the measuring device measures the color of the light projected from the second projection device.

14. The control device according to claim 1, wherein, The processor performs the following processing: With the first color adjustment parameter applied during projection via the first projection device, the first projection device is instructed to project using the first color, and a fifth colorimetric value of the light projected from the first projection device is acquired. Based on the difference between the position of the fifth colorimetric value in the specific color space and the position of the adjustment data based on the first color and the first color adjustment parameter in the specific color space, a second color adjustment parameter suitable for projection through the first projection device is determined.

15. The control device according to claim 1, wherein, The processor performs the following processing: When the first projection device is instructed to project with the first color, the first projection device projects onto a portion of the projection range; When the second projection device is instructed to project with the first color, the second projection device projects onto a portion of the projection range.

16. The control device according to any one of claims 1 to 15, wherein, The first projection device and the second projection device have the same or similar projection characteristics.

17. The control device according to claim 16, wherein, The adjustment data for the first color is for the first projection device, the second projection device, or a projection device having the same or similar projection characteristics as the first and second projection devices, and is created based on the colorimetric values ​​of the projected light, with respect to multiple color adjustment parameters indicating projection using the first color.

18. A control method, wherein, The processor in the control device performs the following processing: Obtain the first colorimetric value of the light of the adjusted color, i.e., the first color, projected from the first projection device; Acquire a second colorimetric value of the light of the first color projected from the second projection device; and Based on the adjustment data of the first color, which represents the relationship between the color adjustment parameter and its position in a specific color space, the first color measurement value, and the second color measurement value, a first color adjustment parameter is determined such that the position of the first color measurement value in the specific color space is close to the position of the second color measurement value in the specific color space.

19. A control program for causing a processor in a control device to perform the following processing: Obtain the first colorimetric value of the light of the adjusted color, i.e., the first color, projected from the first projection device; Acquire a second colorimetric value of the light of the first color projected from the second projection device; and Based on the adjustment data of the first color, which represents the relationship between the color adjustment parameter and its position in a specific color space, the first color measurement value, and the second color measurement value, a first color adjustment parameter is determined such that the position of the first color measurement value in the specific color space is close to the position of the second color measurement value in the specific color space.

Images