JP7384077B2 - multi-projection system - Google Patents

Description

The present invention relates to a multi-projection system.

2. Description of the Related Art Conventionally, a multi-projection system is known in which a plurality of image projection devices are arranged and images projected by each image projection device are connected to display a large screen.

In this multi-projection system, in order to reduce individual differences in color temperature between multiple image projection devices, the color temperature of the image projection devices is corrected based on color temperature characteristics extracted from test patterns that have color temperature information. A technique has been disclosed (for example, see Patent Document 1).

However, with the technique of Patent Document 1, the color temperature may not be fully corrected when the amount of correction is large, and the individual differences in color temperature among a plurality of image projection apparatuses may not be reduced.

An object of the present invention is to reduce individual differences in color temperature among a plurality of image projection devices.

A multi-projection system according to one aspect of the present invention is a multi-projection system that displays a large screen by arranging a plurality of image projection devices and connecting images projected by the respective image projection devices, a determining unit that determines a reference image projection device among the image projection devices that is used as a reference for adjusting the color temperature of the image projection device; and a determination unit that determines a reference image projection device that is used as a reference for adjusting the color temperature of the image projection device; an adjustment unit that adjusts the color temperature of the projection device to match the color temperature of the reference image projection device, and the determination unit adjusts the color temperature adjustment performed in the manufacturing process of each of the plurality of image projection devices. The image projection device with the largest difference value between the color temperature data before adjustment and the color temperature data after adjustment is determined as the reference image projection device.

According to the present invention, individual differences in color temperature among a plurality of image projection devices can be reduced.

1 is a diagram illustrating an example of the overall configuration of a multi-projection system according to an embodiment. 1 is a block diagram of an example hardware configuration of a projector according to an embodiment. FIG. FIG. 2 is a block diagram of an example of the functional configuration of the projector according to the first embodiment. FIG. 3 is a chromaticity diagram showing an example of color temperature information of a projector. FIG. 2 is a diagram illustrating an example of the operation of the multi-projection system according to the first embodiment. It is a figure showing an example of LUT. FIG. 3 is a block diagram of an example of a functional configuration of a projector according to a second embodiment. It is a figure which shows the example of a display of an adjustment state. FIG. 7 is a diagram illustrating an operation example of a multi-projection system according to a second embodiment.

Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. Note that in each drawing, the same components are designated by the same reference numerals, and duplicate explanations will be omitted as appropriate.

In the embodiment, the difference between the color temperature data before adjustment and the color temperature data after adjustment in the color temperature adjustment performed in the manufacturing process of each of the plurality of image projection devices among the plurality of image projection devices included in the multi-projection system. The image projection device with the largest value is determined as the reference image projection device. By adjusting the color temperature of the image projection devices other than the reference image projection device among the plurality of image projection devices to match the color temperature of the reference image projection device, individual differences in color temperature among the plurality of image projection devices can be eliminated. reduce

Here, the color temperature of an image projection device is a measure that expresses the color of light projected by the image projection device using a quantitative value.

Embodiments will be described below, taking as an example a multi-projection system including a plurality of projectors as an example of an image projection device.

<Example of overall configuration of multi-projection system 1>
First, the overall configuration of a multi-projection system 1 according to an embodiment will be described with reference to FIG. 1. FIG. 1 is a diagram illustrating an example of the overall configuration of a multi-projection system 1.

As shown in FIG. 1, the multi-projection system 1 includes a projector 21, a projector 22, and a projector 23. FIG. 1 shows a view of projectors 21, 22, and 23 arranged horizontally from above.

The projector 21 projects an image P ₂₁ , the projector 22 projects an image P ₂₂ , and the projector 23 projects an image P ₂₂ onto the screen S. In multi-projection using a plurality of projectors, projected images P ₂₁ , P ₂₂ , P ₂₃ are joined together to form one large image. The example in Figure 1 shows three projectors arranged side by side in the horizontal (horizontal) direction, but by increasing the number of projectors arranged vertically and horizontally and increasing the number of projected images to be connected, an even larger screen can be achieved. be able to.

Further, although the projectors 21, 22, and 23 are all the same projector, the present invention is not limited to this, and the multi-projection system 1 can also be configured by including different projectors.

Here, the multi-projection system 1 is configured to be able to adjust the color temperature of each of the projectors 21, 22, and 23. Furthermore, the projectors 21, 22, and 23 are electrically connected to each other.

When adjusting the color temperature, an adjuster operates one of the projectors 21, 22, and 23, and the color temperature is adjusted from the operated projector to the other projectors. Here, the adjuster in the embodiment refers to a person who adjusts the color temperature of each of the projectors 21, 22, and 23 that constitute the multi-projection system.

In response to the output from the operated projector, the color temperatures of the other projectors 21, 22, and 23 are adjusted. The operated projector can also adjust its own color temperature.

Each of the projectors 21, 22, and 23 has a function of adjusting another color temperature according to the operation of the adjuster, and the adjuster may select and operate any projector for color temperature adjustment. In the embodiment, for convenience of explanation, it is assumed that the projector 21 is a projector that is operated.

<Example of hardware configuration of projector 21>
Next, the hardware configuration of the projector 21 will be explained with reference to FIG. 2. Although the projector 21 will be described as an example, the projectors 22 and 23 can also have a similar hardware configuration.

FIG. 2 is a block diagram illustrating an example of the hardware configuration of the projector 21. As shown in FIG. As shown in FIG. 2, the projector 21 includes a CPU (Central Processing Unit) 801, a ROM (Read Only Memory) 802, a RAM (Random Access Memory) 803, a media I/F (Interface) 807, and an operation unit. 808 and a power switch 809. Further, a bus line 810, a network I/F 811, an LED (Light Emitting Diode) drive circuit 814, an LED light source 815, a projection device 816, a projection lens 817, an external device connection I/F (Interface) 818, It includes a fan drive circuit 819 and a cooling fan 820.

Among these, the CPU 801 controls the entire operation of the projector 21 . The ROM 802 stores programs used to drive the CPU 801. RAM803 is used as a work area for CPU801.

A media I/F 807 controls reading or writing (storage) of data to a recording medium 806 such as a flash memory.

The operation unit 808 is provided with various keys, buttons, LEDs, etc., and is used by the user to perform various operations other than turning on/off the power of the projector 21. For example, the operation unit 808 receives instruction operations such as a projection image size adjustment operation, a color tone adjustment operation, a focus adjustment operation, and a keystone adjustment operation, and outputs the received operation contents to the CPU 801.

Note that the above users include an adjuster who adjusts the color temperature of each projector included in the multi-projection system 1.

The power switch 809 is a switch for switching the power of the projector 21 on and off. The bus line 810 is an address bus, a data bus, etc. for electrically connecting each component such as the CPU 801 shown in FIG. 2.

The network I/F 811 is an interface for data communication using the communication network 100 such as the Internet. The LED drive circuit 814 controls turning on and off of the LED light source 815 under the control of the CPU 801.

When the LED light source 815 is turned on under the control of the LED drive circuit 814, it irradiates the projection device 816 with projection light. The projection device 816 modulates the projection light from the LED light source 815 using a spatial light modulation method based on the image data provided via the external device connection I/F 818, and outputs the modulated light through the projection lens 817. , is projected onto the projection surface of the screen S as an image. As the projection device 816, for example, a liquid crystal panel or a DMD (Digital Micro-mirror Device) is used. The LED drive circuit 814, the LED light source 815, the projection device 816, and the projection lens 817 collectively function as a projection unit (projection means) that projects a projection image onto a projection surface based on image data.

The external device connection I/F 818 is directly connected to a PC (Personal Computer) and acquires control signals and image data with the PC. The fan drive circuit 819 is connected to the CPU 801 and the cooling fan 820, and drives/stops driving the cooling fan 820 based on a control signal from the CPU 801. The cooling fan 820 cools the inside of the projector 21 by exhausting the air inside the projector 21 by rotating.

Further, when power is supplied, the CPU 801 starts up according to a control program stored in advance in the ROM 802, gives a control signal to the LED drive circuit 814 to light the LED light source 815, and controls the fan drive circuit 819. A signal is given to rotate the cooling fan 820 at a predetermined rated rotation speed. Further, in the projector 21, when the supply of power from the power supply circuit is started, the projection device 816 enters a state capable of displaying an image, and further, power is supplied from the power supply circuit to various other components.

Further, in the projector 21, when the power switch 809 is operated to turn off, a power OFF signal is sent from the power switch 809 to the CPU 801, and when the CPU 801 detects the power OFF signal, it provides a control signal to the LED drive circuit 814 to turn off the LED. The light source 815 is turned off. Thereafter, when a predetermined period of time has elapsed, the CPU 801 gives a control signal to the fan drive circuit 819 to stop the cooling fan 820, ends its own control processing, and finally gives an instruction to the power supply circuit to reduce the power supply power. supply will be stopped.

<Example of functional configuration of projector 21>
Next, the functional configuration of the projector 21 will be explained with reference to FIG. 3. Although the projector 21 will be described as an example here, the projectors 22 and 23 can also have the same functional configuration.

FIG. 3 is a block diagram illustrating an example of the functional configuration of the projector 21. As shown in FIG. As shown in FIG. 3, the projector 21 includes an operation reception section 201, a transmission section 202, a reception section 203, a color temperature acquisition section 204, a storage section 205, and a determination section 206. It also includes an adjustment section 207, an LUT (Look Up Table) storage section 208, an output section 209, and an input section 210.

Among these, the function of the operation reception unit 201 can be realized by the operation unit 808 (see FIG. 2), and the functions of the transmission unit 202, reception unit 203, output unit 209, and input unit 210 can be realized by the external device connection interface. /F818 etc. can be used. Further, the functions of the color temperature acquisition unit 204, the determination unit 206, and the adjustment unit 207 can be realized by the CPU 801 executing a predetermined program, and the functions of the storage unit 205 and the LUT storage unit 208 can be realized by the ROM 802. It can be realized by etc.

The projector 21 acquires the color temperature information of the projector 21 stored in the storage unit 205, the color temperature information of the projector 22 stored in the projector 22, and the color temperature information of the projector 23 stored in the projector 23, and uses these information. Based on this, one of the projectors 21, 22, and 23 is determined as a reference projector for color temperature adjustment. Thereafter, the color temperature of projectors other than the reference projector can be adjusted to match the color temperature of the reference projector.

Below, the details of the functions of each part included in the projector 21 will be explained.

First, the operation reception unit 201 receives an operation by an adjuster to instruct color temperature adjustment. In response to this operation, the color temperature acquisition unit 204 acquires the color temperature information of the projector 21 stored in the storage unit 205.

Specifically, the color temperature acquisition unit 204 requests the projector 22 via the transmission unit 202 to transmit the color temperature information of the projector 22 that the projector 22 stores in the storage unit, and also requests the projector 23 to transmit the color temperature information of the projector 22 stored in the storage unit. The projector 23 requests transmission of color temperature information of the projector 23 stored in the storage unit. Then, the color temperature information transmitted by each of the projectors 22 and 23 in response to the request can be acquired via the receiving unit 203.

Here, the color temperature information of the projector refers to information indicating the color temperature characteristics of the projector. Further, the color temperature information according to the embodiment includes color temperature data before adjustment (hereinafter referred to as pre-adjustment data) in color temperature adjustment performed in the manufacturing process (manufacturing site such as a factory) of each projector, and color temperature data after adjustment. It refers to both color temperature data (hereinafter referred to as adjusted data).

The color temperature adjustment is performed based on the result of measuring the color temperature of the projector, but there are no particular restrictions on the method of measuring and adjusting the color temperature as long as it is performed during the manufacturing process of the projector. Both the pre-adjustment data and the post-adjustment data are stored in a storage unit such as a ROM in the projector where the adjustment has been performed. For example, in the projector 21, the information is stored in the storage unit 205, and in the projectors 22 and 23, it is similarly stored in the storage units provided in each.

The determining unit 206 determines a reference projector to be used as a reference for adjusting the color temperature of the projectors 21 , 22 , 23 based on the color temperature information of the projectors 21 , 22 , 23 . Specifically, the determining unit 206 determines the difference value between the pre-adjustment data and the post-adjustment data of the projectors 21, 22, 23 based on the color temperature information of the projectors 21, 22, 23 acquired by the color temperature acquisition unit 204. The projector with the maximum value is determined as the reference projector.

The adjustment unit 207 performs adjustment to match the color temperature of the projectors other than the reference projector among the projectors 21, 22, and 23 to the color temperature of the reference projector. Specifically, the adjustment unit 207 adjusts the color temperature of the projectors other than the reference projector so as to match the adjusted data of the reference projector determined by the determination unit 206.

The individual difference acquisition unit 271 included in the adjustment unit 207 acquires the difference value between the adjusted data of the reference projector and the adjusted data of projectors other than the reference projector as individual difference data. Further details of the individual difference data and the color temperature information such as the difference value between the pre-adjustment data and the post-adjustment data described above will be described below using FIG. 4.

The RGB acquisition unit 272 included in the adjustment unit 207 refers to the LUT storage unit 208 and acquires RGB data based on the individual difference data acquired by the individual difference acquisition unit 271. This RGB data is data used to adjust color temperature adjustment, and is data indicating the gain and offset of each color of Red (R), Green (G), and Blue (B).

The relationship between individual difference data as a difference in color temperature and RGB data is determined in advance based on experiments or simulations, and is stored in the LUT storage unit 208 as an LUT. The RGB acquisition unit 272 can acquire RGB data by referring to this LUT.

The adjustment unit 207 can output the RGB data acquired for each projector to the projector corresponding to the RGB data via the output unit 209, and can adjust the gain and offset for each color in each projector. Further, the adjustment unit 207 can adjust the gain and offset for each color of the projector 21 itself based on the RGB data of the projector 21 itself.

The input unit 210 has a function of inputting RGB data output from a projector other than the projector 21 when the projector is operated for color temperature adjustment. The adjustment unit 207 can adjust the gain and offset for each color in the projector 21 based on RGB data input via the input unit 210.

Note that the adjustment unit 207 can also output a signal of RGB data via the output unit 209 and input a signal indicating RGB data via the input unit 210.

<Example of color temperature information>
Here, the color temperature information of the projector will be explained with reference to FIG. 4. FIG. 4 is a chromaticity diagram for explaining color temperature information of a projector. Color temperature is expressed in XY coordinates.

A plot indicated by 44 in FIG. 4 indicates a color temperature setting value, and a broken line surrounding the setting value 44 indicates a setting range 45 indicating an allowable range of color temperature error with respect to the setting value.

Further, in FIG. 4, 411 indicated by a white circle mark indicates pre-adjustment data of the projector 21, and 412 indicates post-adjustment data of the projector 21. Further, 421 indicated by a white square mark indicates data before adjustment of the projector 22, and 422 indicates data after adjustment of the projector 22. Further, 431 indicated by a white triangular mark indicates data before adjustment of the projector 23, and 432 indicates data after adjustment of the projector 23.

Such pre-adjustment data and post-adjustment data are each measured as XY coordinate data of a chromaticity diagram in the manufacturing process and stored in the storage unit.

The distance between the pre-adjustment data and the post-adjustment data in the chromaticity diagram corresponds to the difference value between the pre-adjustment data and the post-adjustment data. In the example shown in FIG. 4, among the projectors 21, 22, and 23, the distance between the pre-adjustment data 421 and the post-adjustment data 422 for the projector 22 is the largest, so the projector 22 is determined by the determining unit 206 as the reference projector. Ru. Therefore, the color temperature of the projectors 21 and 23 is adjusted to match the adjusted data 422 of the projector 22 corresponding to the reference projector.

The distance between the adjusted data 422 of the projector 22 and the adjusted data 412 of the projector 21 corresponds to the individual difference data 46 of the projector 21. The distance between the adjusted data 422 and the adjusted data 412 can also be expressed separately into an X coordinate component and a Y coordinate component.

The adjustment unit 207 of the projector 21 refers to the LUT storage unit 208, acquires RGB data corresponding to the individual difference data 46, and adjusts the gain and offset for each color in the projector 21 according to the acquired RGB data. do.

Further, the distance between the adjusted data 422 of the projector 22 and the adjusted data 432 of the projector 23 corresponds to the individual difference data 47 of the projector 23. The distance between the adjusted data 422 and the adjusted data 432 can also be expressed separately into an X coordinate component and a Y coordinate component.

The adjustment unit 207 of the projector 21 refers to the LUT storage unit 208 to acquire RGB data corresponding to the individual difference data 47, and outputs the data for each color in the projector 23 via the output unit 209 according to the acquired RGB data. Adjust the gain and offset.

Here, it is preferable that the adjustment unit 207 adjusts the color temperature so that the color temperature of each of the projectors 21 and 23 matches the color temperature of the projector 22, and the individual difference data of the projectors 21 and 23 becomes zero.

However, since there is a limit to the range in which the gain and offset can be adjusted, it may not be possible to adjust the color temperature of each of the projectors 21 and 23 until it matches the color temperature of the projector 22. In this case, the adjustment unit 207 adjusts the color temperature of each of the projectors 21 and 23 so that it approaches the color temperature of the projector 22, and the individual differences between the projectors 21, 22, and 23 are reduced.

Therefore, adjusting the color temperature of a projector other than the reference projector to match the color temperature of the reference projector requires adjusting the color temperature of the projector other than the reference projector to match the color temperature of the reference projector, and adjusting the color temperature of the projector other than the reference projector. Both include adjustments to bring the color temperature closer to the reference projector's color temperature.

<Example of operation of multi-projection system 1>
Next, the operation of the multi-projection system 1 will be explained with reference to FIG. 5. FIG. 5 is a sequence chart illustrating an example of the operation of the multi-projection system 1. Note that in FIG. 5, the description will be made assuming that the projector 22 is a reference projector.

First, in step S51, the operation reception unit 201 receives an operation from an adjuster instructing color temperature adjustment, and in response to this operation, the color temperature acquisition unit 204 detects the color temperature of the projector 21 stored in the storage unit 205. Get information.

Subsequently, in step S52, the color temperature acquisition unit 204 requests the projector 22, via the transmission unit 202, to transmit the color temperature information of the projector 22 that the projector 22 stores in the storage unit.

Subsequently, in step S53, the projector 22 transmits the color temperature information of the projector 22 stored in the storage section to the projector 21 in response to the request from the color temperature acquisition section 204. Thereby, the color temperature acquisition unit 204 can acquire color temperature information of the projector 22.

Subsequently, in step S54, the color temperature acquisition unit 204 requests the projector 23, via the transmission unit 202, to transmit the color temperature information of the projector 23 that the projector 23 stores in the storage unit.

Subsequently, in step S55, the projector 23 transmits the color temperature information of the projector 22 stored in the storage section to the projector 21 in response to the request from the color temperature acquisition section 204. Thereby, the color temperature acquisition unit 204 can acquire color temperature information of the projector 23.

Note that the order of the operations in steps S51 to S55 may be changed as appropriate, and each operation may be performed in parallel as appropriate.

Subsequently, in step S56, the determining unit 206 determines the pre-adjustment data and post-adjustment data of the projectors 21, 22, 23 based on the color temperature information of the projectors 21, 22, 23 acquired by the color temperature acquisition unit 204. The projector with the maximum difference value is determined as the reference projector. Here, projector 22 is determined as the reference projector.

Subsequently, in step S57, the individual difference acquisition unit 271 acquires the difference value between the adjusted data of the projectors 21 and 23 with respect to the adjusted data of the projector 22 as individual difference data.

Subsequently, in step S58, the RGB acquisition unit 272 refers to the LUT storage unit 208 based on the individual difference data acquired by the individual difference acquisition unit 271, and performs a process for adjusting the color temperature of each of the projectors 21 and 23. Obtain RGB data.

Subsequently, in step S59, the adjustment unit 207 adjusts the gain and offset for each color in the projector 21 based on the RGB data for the projector 21.

Subsequently, in step S60, the adjustment unit 207 sets the gain and offset for each color in the projector 23 based on the RGB data for the projector 23.

In this way, the multi-projection system 1 can be adjusted to reduce individual differences in color temperature among the projectors 21, 22, and 23.

<Example of LUT>
Next, the LUT stored in the storage unit 205 and used for color temperature adjustment will be described with reference to FIG. 6. FIG. 6 is a diagram illustrating an example of the LUT.

The LUT shown in FIG. 6 expresses individual difference data by dividing it into an X coordinate component and a Y coordinate component, and associates the gain and offset of each color with each coordinate component. For example, the additive average of the gain corresponding to the X-coordinate component and the gain corresponding to the Y-coordinate component in the individual difference data is defined as the gain, and the additive average of the offset corresponding to the X-coordinate component and the offset corresponding to the Y-coordinate component in the individual difference data is defined as the gain. It can be an offset.

However, the present invention is not limited to this, and the square root of the sum of squares of the X-coordinate component and Y-coordinate component of the gain and offset may be used as the gain and offset. Furthermore, the format of the LUT is not limited to the example shown in FIG. 6.

<Effects of multi-projection system 1>
Next, the effects of the multi-projection system 1 will be explained.

BACKGROUND ART Multi-projection systems are used for signage applications that create video effects, etc., which connect images projected by multiple projectors to display a large screen. The individual projectors that make up such a multi-projection system keep the color temperature of the product within a preset range. The color temperature is adjusted in the manufacturing process of the projector, and the projector is shipped after being adjusted within a color temperature range of, for example, a set value of ±500K (Kelvin).

However, in a multi-projection system, images projected by a plurality of projectors are joined together, so individual differences in color temperature between projectors are likely to be noticeable at joints in images projected on a large screen. Therefore, even if the color temperature of a single projector is suppressed within a predetermined setting range, it may not be sufficient and seams or the like in the projected image may become noticeable.

Therefore, when constructing a multi-projection system at the installation site, the adjuster generally adjusts the color temperature of each projector to make the joints of projected images less noticeable, but this work takes a lot of time and effort. It can be labor intensive.

In addition, in a multi-projection system, in order to reduce individual differences in color temperature between multiple image projection devices, the color temperature of the image projection device is corrected based on color temperature characteristics extracted from a test pattern that has color temperature information. The technology has been disclosed.

However, there are limits to the adjustable range of gain, offset, etc. for adjusting color temperature. With the above technology, if there is a projector that requires a large amount of correction among multiple projectors, the color temperature may not be fully corrected and individual differences in color temperature among the multiple projectors may not be reduced. be. Individual differences in color temperature make the joints between images projected by each projector stand out, reducing the quality of images produced by the multi-projection system.

In this embodiment, among the projectors 21, 22, and 23 included in the multi-projection system 1, the difference value between the pre-adjustment data and the post-adjustment data in the color temperature adjustment performed in the manufacturing process of each of the projectors 21, 22, 23 is The projector that is the largest is determined as the reference projector. Then, the color temperature of the projectors other than the reference projector is adjusted to match the color temperature of the reference projector.

The projector with the largest difference value between the pre-adjustment data and the post-adjustment data is the projector that has undergone the greatest adjustment during the manufacturing process, and is therefore the projector that is most susceptible to restrictions on the adjustable range such as gain and offset.

By setting such a projector as a reference projector and adjusting the color temperature of projectors other than the reference projector to match the reference projector, adjustment of the color temperature of the reference projector itself becomes unnecessary. Projectors other than the reference projector are less likely to be subject to restrictions in the adjustable range of gain and offset than the reference projector, so the adjustable range of gain and offset can be widely utilized. As a result, individual differences in color temperature among the projectors 21, 22, and 23 can be reduced more suitably.

Further, in this embodiment, the projectors 21, 22, and 23 each include a storage section in which pre-adjustment data and post-adjustment data in the manufacturing process are stored. Therefore, by referring to the storage section of each projector, the pre-adjustment data and post-adjustment data of each projector can be easily acquired. However, the present invention is not limited to this, and the pre-adjustment data and post-adjustment data may be stored in an external device such as a control terminal, and the color temperature data may be obtained by referring to the external device. It is also possible to store the pre-adjustment data and the post-adjustment data in an external server, and to obtain color temperature data by referring to the external server via a network.

[Second embodiment]
Next, a multi-projection system according to a second embodiment will be described.

In this embodiment, the color temperature adjustment state of the image projection device is displayed, and the color temperature of multiple projectors in a multi-projection system is adjusted based on the color temperature adjustment operation performed by the adjuster according to the displayed adjustment state. Make adjustments. Since the adjuster can adjust the color temperature while visually checking the adjustment state, the color temperature can be adjusted reliably and easily.

FIG. 7 is a block diagram illustrating an example of the functional configuration of the projector 21a included in the multi-projection system 1a according to the present embodiment. Similar to the first embodiment, the multi-projection system 1a includes projectors 21a, 22, and 23. The projector 21a corresponds to the projector selected by the adjuster to adjust the color temperature of each of the projectors 21a, 22, and 23.

As shown in FIG. 7, the projector 21a includes an operation reception section 201a, an adjustment section 207a, and a display control section 211.

The functions of the operation reception unit 201 can be realized by the operation unit 808 (see FIG. 2), and the functions of the adjustment unit 207a and the display control unit 211 can be realized by the CPU 801 executing a predetermined program.

In the above configuration, the display control unit 211 displays the adjustment state of the color temperature of the projectors 21a, 22, and 23. The display control unit 211 can display the color temperature adjustment state by controlling the projector 21a to project an image such as a chromaticity diagram described below using FIG. 8. However, at least one of the projectors 21a, 22, and 23 may project and display an image such as a chromaticity diagram.

The operation reception unit 201a receives a color temperature adjustment operation performed by an adjuster while visually checking the displayed adjustment state. The adjuster can perform color temperature adjustment operations by pressing various keys and buttons on the operation unit 808.

The adjustment unit 207a adjusts the color temperature of the projectors 21a, 22, and 23 based on the adjustment operation performed by the adjuster. The individual difference acquisition unit 271a included in the adjustment unit 207a acquires the individual difference data of the color temperature data of the projector during the adjustment operation with respect to the adjusted data of the reference projector determined by the determination unit 206. Furthermore, the RGB acquisition unit 272 can refer to the LUT storage unit 208 and acquire RGB data for color temperature adjustment based on the individual difference data acquired by the individual difference acquisition unit 271a.

Here, FIG. 8 is a diagram illustrating an example of display of the adjustment state. FIG. 8 shows an image of the chromaticity diagram included in the image _P21a projected onto the screen S (see FIG. 1) by the projector 21a. The adjuster can perform color temperature adjustment operations while visually checking such a chromaticity diagram image. The status bars 81 and 82 included in the chromaticity diagram image are graphic displays whose length and direction change according to adjustment operations performed by the adjuster.

The status bar 81 starts from the adjusted data 412 of the projector 21a and changes its length toward the adjusted data 422 of the reference projector according to the adjustment operation, thereby indicating the progress of the color temperature adjustment of the projector 21a ( adjustment status).

Similarly, the status bar 82 shows the progress of the color temperature adjustment of the projector 23 by starting from the adjusted data 432 of the projector 23 and changing its length toward the adjusted data 422 of the reference projector according to the adjustment operation. Display the status (adjustment status).

Next, FIG. 9 is a sequence chart for explaining an example of the operation of the multi-projection system 1a. Note that the operations in steps S91 to S96 in FIG. 9 are the same as steps S51 to S56 in FIG. 5, so a redundant explanation will be omitted here.

In step S97, the display control unit 211 controls the projector 21a to display a chromaticity diagram showing the color temperature of the projector 21a.

Subsequently, in step S98, the operation reception unit 201a receives a color temperature adjustment operation performed by the adjuster while visually checking the displayed adjustment state.

Subsequently, in step S99, the individual difference acquisition unit 271a acquires individual difference data of the color temperature data of the projector 21a with respect to the adjusted data of the reference projector (projector 22) determined by the determination unit 206.

Subsequently, in step S100, the RGB acquisition unit 272 refers to the LUT storage unit 208 and acquires RGB data for adjusting the color temperature of the projector 21a based on the individual difference data acquired by the individual difference acquisition unit 271a.

Subsequently, in step S101, the adjustment unit 207a adjusts the color temperature of the projector 21a based on the adjustment operation performed by the adjuster.

The operations of steps S97 to S101 are repeated until the operation reception unit 201a receives an operation by the adjuster indicating the end of adjustment of the projector 21a. When the operation receiving unit 201a receives an operation indicating completion of adjustment of the projector 21a, the operation moves to step S102.

Subsequently, in step S102, the display control unit 211 controls the projector 21a to display a chromaticity diagram indicating the color temperature of the projector 23.

Subsequently, in step S103, the operation reception unit 201a receives a color temperature adjustment operation performed by the adjuster while visually checking the displayed adjustment state.

Subsequently, in step S104, the individual difference acquisition unit 271a acquires individual difference data of the color temperature data of the projector 23 with respect to the adjusted data of the projector 22 determined by the determination unit 206.

Subsequently, in step S105, the RGB acquisition unit 272 refers to the LUT storage unit 208 and acquires RGB data for adjusting the color temperature of the projector 23 based on the individual difference data acquired by the individual difference acquisition unit 271a.

Subsequently, in step S106, the adjustment unit 207a adjusts the color temperature of the projector 23 based on the adjustment operation performed by the adjuster.

The operations of steps S102 to S106 are repeated until the operation reception unit 201a receives an operation by the adjuster indicating the end of adjustment of the projector 23. The operation ends when the operation reception unit 201a receives an operation indicating the end of adjustment of the projector 23.

In this way, the multi-projection system 1a can be adjusted to reduce individual differences in color temperature among the projectors 21a, 22, and 23.

As described above, in this embodiment, the color temperature adjustment status of the projectors 21a, 22, and 23 is displayed, and the projector 21a is adjusted based on the color temperature adjustment operation performed by the adjuster according to the displayed adjustment status. , 22, and 23 are adjusted. By allowing the adjuster to adjust the color temperature while visually checking the adjustment state, the color temperature can be adjusted reliably and easily.

Although the best mode for carrying out the present invention has been described above using examples, the present invention is not limited to these examples, and various modifications and changes can be made without departing from the gist of the present invention. Substitutions can be added.

Note that the multi-projection system 1 can also be configured such that each of the projectors 21, 22, and 23 has some or all of the functions provided in the projector 21 in a distributed manner.

Further, in the above-described embodiment, a case where the LED light source 815 is used as a light source is shown as a representative example, but the light source of the projector 21 is not limited to the LED light source 815. Instead of the LED light source 815, a laser, a high-pressure mercury lamp, or the like can also be used.

Moreover, each function of the embodiment described above can be realized by one or more processing circuits. Here, the term "processing circuit" as used herein refers to a processor programmed to execute each function by software, such as a processor implemented by an electronic circuit, or a processor designed to execute each function explained above. This includes devices such as ASICs (Application Specific Integrated Circuits), DSPs (digital signal processors), FPGAs (field programmable gate arrays), and conventional circuit modules.

1 Multi-projection system 21, 23 Projector (an example of an image projection device)
22 Projector (an example of an image projection device, an example of a reference image projection device)
201 Operation reception section 202 Transmission section 203 Receiving section 204 Color temperature acquisition section 205 Storage section 206 Determination section 207 Adjustment section 271 Individual difference acquisition section 272 RGB acquisition section 208 LUT storage section 209 Output section 210 Input section 211 Display control section 411, 421 , 431 Pre-adjustment data (an example of color temperature data before adjustment)
412, 422, 432 Adjusted data (an example of adjusted color temperature data)
46, 47 Individual difference data 81, 82 Status bar (an example of adjustment status)

Patent No. 6471438

Claims (4)

A multi-projection system that displays a large screen by arranging a plurality of image projection devices and connecting images projected by each image projection device,
a determining unit that determines a reference image projection device among the plurality of image projection devices as a reference for adjusting the color temperature of the image projection device;
an adjustment unit that adjusts the color temperature of the image projection devices other than the reference image projection device among the plurality of image projection devices to match the color temperature of the reference image projection device;
The determining unit sets, as the reference image projection device, the image projection device having the largest difference value between the color temperature data before adjustment and the color temperature data after adjustment in the color temperature adjustment performed in the manufacturing process of each of the plurality of image projection devices. A multi-projection system is determined as an image projection device. The multi-projection system according to claim 1, wherein each of the plurality of image projection devices includes a storage section in which the unadjusted color temperature data and the adjusted color temperature data are stored. The adjustment unit is configured to adjust the adjustment unit based on individual difference data between the adjusted color temperature data in the image projection device other than the reference image projection device and the adjusted color temperature data in the reference image projection device. The multi-projection system according to claim 1 or 2, wherein the multi-projection system performs adjustment. a display control unit that displays an adjustment state of color temperature of the image projection device;
an operation reception unit that receives an adjustment operation by an adjuster of the multi-projection system according to the adjustment state,
The multi-projection system according to any one of claims 1 to 3, wherein the adjustment section performs the adjustment based on the adjustment operation performed by the adjuster according to the adjustment state.

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