JP2005286605A - Color luminance correction apparatus, projector provided with color luminance correction apparatus, and color luminance correction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color luminance correction apparatus capable of realizing color luminance correction in accordance with a luminance change in a reflected light of all projected image lights, and to provide a projector. <P>SOLUTION: The color luminance correction apparatus 20 includes: a first memory 2 that stores reflection luminance information of a reflected light of each color respectively detected by photoelectric conversion elements having four color (red, green, blue, yellow) filters and receiving the reflected light 17 from a projection screen 30; a second memory 26 for storing in advance reference luminance information of the predetermined reflected light by each color; a color luminance correction data generating section 27 for comparing the reflection luminance information with the reference luminance information to generate color luminance correction data; and a color luminance correction circuit section 28 for correcting an image signal received by the projection unit 10 on the basis of the color luminance correction data, and the projector 1 sequentially projects image lights in four colors or more formed by an image forming section 14 to the projection screen 30 to display a color image. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to color luminance correction of a projector, and more particularly, to a color luminance correction device, a projector including the color luminance correction device, and a color luminance correction method in the projector.

In the case of a projector that displays a color image by sequentially projecting image light of each color of red (R), green (G), and blue (B) onto a projection surface, the projection surface does not necessarily have a predetermined reflection characteristic. The color reproducibility is not limited depending on the reflection characteristics of the projection surface. In addition, color reproducibility also decreases due to the influence of ambient light (ambient light). Therefore, conventionally, the luminance value (intensity) of the reflected light of the image light projected on the projection surface is detected for each wavelength, and the luminance correction of the color is performed based on the detection result. Specifically, the reflected light is spectrally decomposed into three primary colors of R, G, and B using a diffraction grating and a prism, and the brightness of each color light is detected by a color sensor, and the brightness of each color light is adjusted to be as equal as possible. By doing so, the color reproducibility is improved. Here, a color sensor mounted on a general projector includes a red sensor for detecting the luminance of light in the 660 nm band, a green sensor for detecting the luminance of light in the 540 nm band, and the luminance of light in the 460 nm band. It is comprised from three monochromatic sensors, such as a blue sensor for detecting. The characteristics of each monochrome sensor are shown in FIG. FIG. 7 is a graph showing the characteristics of each single color sensor constituting the conventional color sensor. What is indicated by the one-dot chain line in the figure is the wavelength at the center of yellow, and it can be seen that the yellow luminance value cannot be measured correctly by either the green sensor or the red sensor. The details of the color luminance correction of the projector as described above are disclosed in, for example, Patent Document 1.
JP 2003-323610 A

  Since the image light projected by the conventional projector contains only the three primary colors R, G, and B, the color luminance correction based on the detection results of the three color sensors as described above is necessary and sufficient. However, among recent projectors, there are projectors that project color lights other than R, G, and B as independent image lights in order to improve color reproducibility. In such a projector, the color luminance correction based on the detection result of the color sensor composed of the three single color filters as described above is insufficient, and the color lights other than R, G, and B are projected independently. However, the effect may not be sufficiently obtained. For example, even when yellow (Ye) image light is projected in addition to R, G, and B image light, none of the red, green, and blue sensors reacts to yellow (Ye). Therefore, even if color luminance correction is performed based on the luminance of reflected light detected by the red sensor, green sensor, and blue sensor, an accurate correction result cannot be obtained for yellow (Ye), and sufficient color reproducibility is not obtained. Not achieved.

  An object of the present invention is to provide a color luminance correction apparatus capable of realizing color luminance correction corresponding to the luminance change of all the color lights included in the projected image light, a projector including the color luminance correction apparatus, and a color luminance correction method. It is to provide.

The color luminance correction apparatus of the present invention is
A color for adjusting the brightness of the reflected light of the image light of each color projected on the projection surface provided in a projector that displays a color image by sequentially projecting four or more colors of image light onto the projection surface by the projection device This is a brightness correction device. A color sensor unit that receives a reflected light of image light for each color projected on the projection surface and measures a luminance of the reflected light for each color, and outputs a measured luminance value; and from the color sensor unit A first storage unit that stores information indicating the luminance value of the reflected light of each input color; a second storage unit that stores in advance information indicating the reference luminance value of the reflected light determined for each color; Color luminance correction data generating means for generating color luminance correction data by comparing information stored in the first storage means with information stored in the second storage means, and based on the color luminance correction data Color luminance correction means for correcting an image signal input to the projection apparatus.

  The image light projected on the projection surface may be red, green, blue and yellow, and the information stored in the first storage means is the luminance value of the reflected light of each color detected by the color sensor unit. The brightness value of the reflected light of each color detected by the color sensor unit is obtained by subtracting the brightness value of the ambient light reflected by the projection surface when no image light is projected on the projection surface. The information stored in the second storage means is the brightness value of the reflected light of each color detected by the color sensor unit when the image light of each color is projected onto the white projection surface. May be indicated.

  The projector according to the present invention includes the above-described color luminance correction device, and an image signal whose color luminance is corrected by the color luminance correction unit of the color luminance correction device is input to an image forming unit provided in the projection device.

The color luminance correction method in the projector of the present invention,
This is a color luminance correction method in a projector that displays a color image by sequentially projecting four or more colors of image light onto a projection surface by a projection device. A step of sequentially projecting image light of four or more colors on the projection surface, a step of detecting the luminance value of the reflected light of the image light projected on the projection surface for each color, and the luminance value of the detected reflected light of each color Comparing the reference brightness predetermined for each color to generate color brightness correction data, and correcting the image signal input to the image forming unit based on the generated color brightness correction data. Have.

  Therefore, not only when the image light of the three primary colors is projected, but also when the image light of a color other than the three primary colors is projected, the luminance change of the reflected light of all the image lights is detected, and appropriate color luminance correction is performed. Is executed. As a specific method of color luminance correction, the detected luminance value of reflected light is compared with a preset reference luminance value, and an actual luminance balance is set in advance. A method for correcting the luminance information in the image signal so as to be the same is considered as an example.

  According to the present invention, the color luminance correction device of the projector measures the luminance values of all the colors constituting the projection light, and compares the luminance value as a reference with the image signal of each color of the original image input to the projection device. Since the luminance value is corrected so as to correspond to the reference luminance value, there is an effect that color luminance correction corresponding to the luminance change of the reflected light of all the image light projected from the projector device can be executed.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram for explaining a color luminance correction apparatus and a projector including the color luminance correction apparatus according to the first embodiment of the present invention.

  The color luminance correction device 20 according to the first embodiment of the present invention is configured so that the color luminance of the reflected light 17 of the projection image projected from the projection device 10 of the projector 1 onto the projection surface 30 becomes the color luminance of the original image. The corrected input signal is output to the projection apparatus 10.

  The color luminance correction apparatus 20 receives the reflected light 17 from the projection surface 30 and outputs a color luminance value signal from the color sensor 22 that includes a color sensor 22 that outputs a color luminance value for each color. A first memory 24 that is input and stored as a reflected luminance value table 23, a second memory 26 that stores a reference luminance value table 25 for each color, a reflected luminance value stored in the first memory 24, and a second memory A color luminance correction data generation unit 27 that generates a color luminance correction data by comparing the reference luminance value for each color stored in 26, and an image signal input to the projection apparatus 10 based on the color luminance correction data. A color luminance correction circuit unit 28 for correction and a changeover switch 29 for switching an image signal input to the projection apparatus 10 to the color luminance correction circuit unit 28 are provided.

  The color luminance detection unit constituting the color sensor 22 is a photoelectric conversion element that outputs a voltage corresponding to the luminance of incident light, and a photoelectric conversion element provided with a filter that transmits only that color for each color to be corrected Is provided. FIG. 2 is a schematic perspective view of the color sensor. In the figure, each photoelectric conversion element is provided as a red light receiving part 221, a green light receiving part 222, a blue light receiving part 223, and a yellow light receiving part 224 with a color filter at each incident part, each provided on a common substrate, and applied from a cathode 225. The obtained voltage is a voltage corresponding to the color luminance and is output from the red anode 226, the green anode 227, the blue anode 228, and the yellow anode 229 to the first memory 24 as a color luminance value signal. As the photoelectric conversion element, a photodiode, a phototransistor, a CCD (Charge Coupled Devices), a CMOS (Complementary Metal Oxide Semiconductor), or the like is used. A structure in which four individual photoelectric conversion elements are provided may be employed.

  The first memory 24 creates and stores a reflected luminance value table 23 based on the color luminance value signal input from the color sensor 22. The second memory 26 also has a photoelectric conversion element of the color sensor 22 corresponding to each color when image light of each color of red, green, blue, and yellow is individually projected on a white body (white screen). Is stored in advance as a reference luminance value table 25 in which the value of the voltage output from is used as a reference luminance value without attenuation. The first memory 24 and the second memory 26 do not need to be two physically independent memories, but a certain area in the same memory is used as the first memory 24 and another area is used as the second memory 26. You can also. Hereinafter, red, green, blue, and yellow are abbreviated as R, G, B, and Ye.

  The color luminance correction data generation unit 27 balances the reflection luminance value table 23 held in the first memory 24 based on the reference luminance value table 25 held in the second memory 26 for each color of the current reflection luminance value. A normalization table for performing normalization for correcting the value to a normal value balance is created, and the created normalization table is output to the color luminance correction circuit unit 28 as color luminance correction data. Specifically, the actual R, G, B, Ye reflected light values shown in the current reflected luminance value table 23 and the ideal R, G, B, The ratio of Ye to the brightness value of each reflected light is calculated, and a normalization table for making the current reflected brightness value the same balance as the reference brightness value is created based on the result. FIG. 3 is a graph showing the characteristics of each monochromatic sensor constituting the color sensor of the present invention.

  For example, when image light is projected onto the projection surface 30 (for example, a gray screen) having a uniform reflection efficiency for the entire visible light region, R, G, B, and Ye are absorbed at substantially the same rate. FIG. 4 is a schematic diagram showing a process of creating a normalization table for making the luminance value of the reflected light of the projection surface with uniform bad reflection efficiency the same balance as the reference luminance value. As shown in FIG. 4, the current R, G, B, Ye luminance values shown in the reflected luminance value table 23 are the same as the R, G, B, Ye luminance values shown in the reference luminance value table 25. On the other hand, the result is almost uniform. Therefore, the actual R, G, B, Ye reflected light values shown in the current reflected luminance value table 23 and the ideal R, G, B, Ye values shown in the reference luminance value table 25 are shown. The ratio with the luminance value of the reflected light is constant, and a normalization table 27a indicating that the ratio is constant as shown in the figure is obtained.

  On the other hand, when the projection light 16 is projected on the projection surface 30 having poor reflection efficiency only for light in a certain wavelength region, for example, a screen having poor reflection efficiency for light in the vicinity of a wavelength of 580 nm (so-called yellow), R, G, B, Ye Among them, Ye is absorbed relatively much. FIG. 5 is a schematic diagram showing a process of creating a normalization table for setting the brightness value of the reflected light of the screen to the same balance as the reference brightness value when image light is projected onto a screen having poor reflection efficiency for yellow light. is there. As shown in FIG. 5, the current ratio of R, G, and B brightness values shown in the current reflection brightness value table 23 is the same as the ratio of the R, G, and B brightness values shown in the reference brightness value table 25. Although the same, the current Ye luminance value shown in the reflection luminance value table 23 is lower than the ratio of the Ye luminance values shown in the reference luminance value table 25. Therefore, when the ratio between the R, G, B, and Ye luminance values shown in the reflected luminance value table 23 and the R, G, B, and Ye luminance values shown in the reference luminance value table 25 is calculated, FIG. A normalization table 27b as shown is obtained. Here, when a relatively large amount of Ye is absorbed and the luminance value of Ye decreases, it is felt by the human eye that B, which is a complementary color of Ye, has increased, rather than Ye has decreased. However, since the luminance values of R, G, and B are not actually changed, the luminance value is obtained when a monochrome sensor that individually detects only the luminance values of R, G, and B is provided as in the conventional example. No change is detected and no color luminance correction is performed.

  The color luminance correction circuit unit 28 corrects the image signal input to the projection device 10 according to the color luminance correction data input from the color luminance correction data generation unit 27, and outputs the processed image signal to the projection device 10. . More specifically, when the normalization table 27a as shown in FIG. 4 is created, the current luminance values of R, G, B, Ye are ideal R values shown in the reference luminance value table 25. , G, B, Ye have the same balance as the luminance values, and there is no need for color luminance correction. Therefore, the color luminance correction circuit unit 28 outputs the input image signal to the projection device 10 as it is.

  When the normalization table 27b as shown in FIG. 5 is created from the reflection luminance value and the reference reflection luminance value when image light is projected onto a screen having only poor reflection efficiency for yellow, R, G, B, Ye Any one or two or more of the luminance values is lower than the ideal luminance value, and color luminance correction is necessary to ensure good color reproducibility. Therefore, the color luminance correction circuit unit 28 decreases the luminance value of the color other than the color whose luminance value is reduced in the normalization table 27b, or reduces the luminance value of the complementary color of the color whose luminance value is reduced. The brightness value information in the image signal is corrected. For example, when the normalization table 27b as shown in FIG. 5 is created, the luminance value of Ye is lowered, so that all the luminance values of R, G, and B are lowered to match the luminance value of Ye. Alternatively, the luminance value of B, which is a complementary color of Ye, is lowered according to the luminance value of Ye.

  When the above-described reference luminance value table 25 and reflection luminance value table 23 are created, if an operation of subtracting the luminance value detected by the sensor in a state where no image light is projected, more accurate color luminance correction is performed. Can be realized. This is because the luminance value detected by the sensor in a state in which no image light is projected is the luminance value of the reflected light of the ambient light, and if this luminance value is subtracted, the change caused by the projection of the image light can be obtained. This is because correction can be performed based only on the above.

  Each component of the color luminance correction device 20 may be individually disposed inside the projector 1 or may be configured as an integral unit. By configuring integrally, the projector 1 can be easily provided with the color luminance correction device 20 and without the color luminance correction device 20.

  Next, a projector provided with a color luminance correction apparatus according to a second embodiment of the present invention will be described in detail with reference to FIG. The projector 1 according to the second embodiment includes a projection device 10 and the color luminance correction device 20 according to the first embodiment.

  The projection device 10 includes a light source device 11, a color wheel 12 as time-division color separation means for color-separating light (white light) emitted from the light source device 11 in a time division manner, and each color light separated by the color wheel 12. Are reflected toward a reflection type image forming unit 14 to be described later, and the TIR prism (total reflection prism) 13 that transmits the image light formed by the reflection type image forming unit 14 as it is, and each color reflected by the TIR prism 13 A reflective image forming unit 14 that spatially modulates light based on an image signal to form image light, and a projection lens 15 that enlarges and projects image light transmitted through the TIR prism 13 toward the projection surface 30. I have.

  The light source device 11 includes a light source composed of a high-pressure discharge lamp such as a metal halide lamp, a xenon lamp, or a mercury lamp, and a reflector provided around the light source. The reflector has, for example, a spheroidal reflecting surface, and condenses light emitted in all directions from a light source disposed in the vicinity of the first focal point in the vicinity of the second focal point. But the shape of the reflective surface of a reflector is not specifically limited, What is necessary is just the shape which can inject the light radiated | emitted from the light source into the color wheel 12 efficiently.

  The color wheel 12 has a substantially fan-shaped red filter that transmits only red light, a substantially fan-shaped green filter that transmits only green light, a substantially fan-shaped blue filter that transmits only blue light, and only yellow light. A substantially fan-shaped yellow filter is disposed. Further, the color wheel 12 is disposed in the vicinity of a condensing point by the reflector of the light source device 11, and is rotated in the circumferential direction by a driving mechanism (not shown). Therefore, the white light emitted from the light source device 11 enters each color filter of the color wheel 12, is separated into red light, green light, blue light, and yellow light in a time-sharing manner, and enters the TIR prism 3 at a predetermined incident angle. Incident.

  In the TIR prism 13, the incident angle of the light transmitted through the color wheel 12 with respect to the total reflection surface exceeds the critical angle, and the incident angle with respect to the total reflection surface of the light reflected by the reflective image forming unit 14 does not exceed the critical angle. Is arranged. Accordingly, each color light color-separated in a time division manner by the color wheel 12 is reflected by the total reflection surface of the TIR prism 13 and irradiated to the reflective image forming unit 14, and the light reflected by the reflective image forming unit 14 is It passes through the total reflection surface as it is.

  The reflection-type image forming unit 14 is a reflection-type liquid crystal panel or DLP (registered trademark), and a cell or a micromirror corresponding to each pixel of a projection image is individually driven according to an input image signal, thereby irradiating. The respective color lights are spatially modulated to form image light of each color of R, G, B, Ye in time series. The R, G, B, and Ye image lights formed by the reflective image forming unit 14 pass through the total reflection surface of the TRI prism 13, enter the projection lens 16, and are sequentially projected toward the projection surface 30. The As a result, it is recognized as a full-color image by human eyes due to the afterimage phenomenon.

  The steps of color luminance correction in the projector according to the second embodiment of the invention having the above configuration will be described in order with reference to FIG. FIG. 6 is a flowchart showing an example of the color luminance correction method in the projector of the present invention.

  First, the color wheel 12 shown in FIG. 1 rotates to insert a red filter into the optical path, R image light is projected onto the projection surface 30, and reflected light (R reflection) of the R image light projected onto the projection surface 30. The brightness value of light is detected by the color sensor 22 and stored in the first memory 24 (step S1). Next, a green filter is inserted into the optical path, and the luminance value of the reflected light (G reflected light) of the G image light projected on the projection surface 30 is detected by the color sensor 22 and stored in the first memory 24 ( Step S2). Next, a blue filter is inserted into the optical path, and the brightness value of the reflected light (B reflected light) of the B image light is detected by the color sensor 22 and stored in the first memory 24 (step S3). Finally, a yellow filter is inserted into the optical path, and the brightness value of the reflected image light (Ye reflected light) of Ye is detected by the color sensor 22 and stored in the first memory 24 (step S4). Here, the execution order of steps S1 to S4 can be arbitrarily changed. In short, it is only necessary to sequentially project four or more colors of image light projected to display a full color image, and to detect the luminance value of each reflected light by the color sensor 22, and the projection order of the image light is essential. It is not a condition. While steps S1 to S4 are being executed, an image signal that has passed through the color luminance correction circuit unit 28 is input to the reflective image forming unit 14 by switching the changeover switch 29 shown in FIG. Further, the reflective image forming unit 14 is driven at the maximum output.

  Next, a reflection luminance value table 23 is created based on the luminance value information indicating the luminance values of the current R, G, B, Ye reflected light obtained in steps S1 to S4 and stored in the first memory 24. (Step S5).

  Next, normalization tables 27 a and 27 b based on the reflection luminance value table 23 created in step S 5 and the reference luminance value table 25 previously stored in the second memory 12 by the color luminance correction data generation unit 27. Is generated (step S6), and is output as color luminance correction data to the color luminance correction circuit unit 28 (step S7). In addition, since the creation method of the normalization tables 27a and 27b has already been described, the description is omitted here.

  Subsequently, the necessity of color luminance correction is determined by the color luminance correction circuit unit 28 (step S8). Specifically, if the luminance value graphs of the reflected light of R, G, B, Ye shown in the normalization table 27a input as color luminance correction data are the same, there is no need for color luminance correction. Is determined (step S8N), and the input image signal is output as it is to the reflective image forming unit 14 (step S10). On the other hand, when the luminance value of at least one color is relatively low among the luminance value graphs of the reflected light of R, G, B, Ye shown in the normalization table 27b input as the color luminance correction data If it is determined that color luminance correction is necessary (step S8Y), the luminance value information in the image signal is corrected so as to lower the luminance value of a color other than the color having a low luminance value or to lower the luminance value of the complementary color of the color. (Step S9), the corrected image signal is output to the reflective image forming unit 14 (Step S10). If the process is not finished (step S11N), the process returns to step S1 to repeat the process, and if finished (step S11Y), the process is finished.

  In the present embodiment, the projector according to the embodiment of the present invention has been described by taking as an example the case where Ye image light is projected in addition to R, G, and B image light. However, the color of the projected image light in addition to the R, G, and B image light is not limited to Ye, and can be arbitrarily selected as necessary. For example, light blue or purple image light can be projected. In order to change the color of the projected image light, the color wheel 12 shown in FIG. 1 may be replaced with a color wheel capable of separating desired color light, and the color filter of the photoelectric conversion element of the color sensor 22 may be replaced. Further, even when there are five or more colors, it is possible to cope with the problem by adding a photoelectric conversion element and a color filter.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram for explaining a color luminance correction apparatus according to a first embodiment of the present invention and a projector including the color luminance correction apparatus. It is a typical perspective view of a color sensor. It is a graph which shows the characteristic of each single color sensor which comprises the color sensor of this invention. It is a schematic diagram which shows the creation process of the normalization table for making the brightness | luminance value of the reflected light of the projection surface with uniform bad reflection efficiency the same balance with a reference | standard brightness value. It is a schematic diagram which shows the creation process of the normalization table for making the luminance value of the reflected light of a screen into the same balance as a reference luminance value when an image light is projected on a screen with bad reflection efficiency with respect to yellow light. It is a flowchart which shows an example of the color luminance correction method in the projector of this invention. It is a graph which shows the characteristic of each single color sensor which comprises the conventional color sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 10 Projection apparatus 11 Light source apparatus 12 Color wheel 13 TIR prism 14 Reflection type image formation part 15 Projection lens 16 Projection light 17 Reflection light 20 Color brightness correction apparatus 21 Color sensor part 22 Color sensor 23 Reflection brightness value table 24 1st memory 25 Reference luminance value table 26 Second memory 27 Color luminance correction data generation unit 27a, 27b Normalization table 28 Color luminance correction circuit unit 29 Changeover switch 30 Projection surface 221 Red light receiving unit 222 Green light receiving unit 223 Blue light receiving unit 224 Yellow light receiving unit 225 Cathode 226 Red anode 227 Green anode 228 Blue anode 229 Yellow anode S1-S11 Step

Claims (9)

Provided in a projector that sequentially projects four or more colors of image light onto a projection surface by a projection device to display a color image, and for adjusting the brightness of the reflected light of the image light of each color projected on the projection surface A color luminance correction device,
A color sensor that receives the reflected light of the image light for each color projected on the projection surface and measures the brightness of the reflected light for each color, and outputs a measured brightness value;
First storage means for storing information indicating the luminance value of the reflected light of each color input from the color sensor unit;
Second storage means in which information indicating the reference luminance value of the reflected light determined for each color is stored in advance;
Color luminance correction data generating means for generating color luminance correction data by comparing the information stored in the first storage means with the information stored in the second storage means;
A color luminance correction device comprising color luminance correction means for correcting an image signal input to the projection device based on the color luminance correction data.   The color luminance correction apparatus according to claim 1, wherein the image light projected on the projection surface is red, green, blue, and yellow.   The color luminance correction apparatus according to claim 1, wherein the information stored in the first storage unit indicates a luminance value of reflected light of each color detected by the color sensor unit.   The information stored in the first storage means is reflected by the projection surface from the luminance value of the reflected light of each color detected by the color sensor unit in a state where no image light is projected on the projection surface. The color luminance correction apparatus according to claim 1 or 2, wherein the luminance value obtained by subtracting the luminance value of ambient light is indicated.   The information stored in the second storage means indicates a luminance value of reflected light of each color detected by the color sensor unit when the image light of each color is projected onto a white projection surface. The color luminance correction apparatus according to claim 1.   The color luminance correction apparatus according to any one of claims 1 to 5, wherein the components of the color luminance correction apparatus are configured as an integral unit.   An image signal having the color luminance correction device according to claim 1, wherein the color luminance is corrected by the color luminance correction means of the color luminance correction device is input to an image forming unit provided in the projection device. Projector. A color luminance correction method in a projector for displaying a color image by sequentially projecting four or more colors of image light onto a projection surface by a projection device,
Sequentially projecting the image light of four or more colors on the projection surface;
Detecting a luminance value of reflected light of image light projected on the projection surface for each color;
Comparing the detected luminance value of the reflected light of each color with a reference luminance predetermined for each color, and generating color luminance correction data;
And correcting the image signal input to the image forming unit based on the generated color luminance correction data. Detecting a luminance value of reflected light of ambient light reflected by the projection surface in a state where image light is not projected on the projection surface;
Subtracting the brightness of the reflected light of the ambient light from the brightness value of the reflected light of the image light projected on the projection surface;
The color luminance correction method for a projector according to claim 8, wherein the color luminance correction data is generated by comparing the luminance value obtained by the subtraction with the reference luminance value.

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