JP2009147431A - Projection type image display device, image display system and color irregularity correcting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type image display device highly accurately correcting color irregularity at a high speed. <P>SOLUTION: The projection type image display device projects images based on plural kinds of chromatic light by a predetermined gradation and uses results of image pickup of a plurality of image pickup elements corresponding to the plural kinds chromatic light to correct color irregularity for a plurality of regions of projected images, respectively. The image display device has: a control section for acquiring detection values for chromatic light to which the image pickup elements correspond and detection values of chromatic light to which the elements do not correspond at the time of sequentially projecting monochromatic images of the plural kinds chromatic light as the projection images, obtaining corrected values output from the image pickup elements corresponding to the chromatic light of predetermined gradation by using the acquired values, and creating adjustment values for adjusting the image signals of a plurality of gradations on the basis of the corrected values; and a memory for storing the adjustment values. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projection-type image display apparatus, an image display system, and a method for correcting color unevenness that correct color unevenness by using a captured image of a projected image.

  An optical device for forming an image is provided in a projector that is one of projection type image display apparatuses. If the optical characteristics of the optical device vary, even if a monochromatic image is displayed on the front surface, the so-called color unevenness in which the luminance varies depending on the position (projection position) of the image forming unit may occur. . On the other hand, several apparatuses for correcting the color unevenness have been proposed, and for example, disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 10-84551).

  The apparatus disclosed in Patent Document 1 is an apparatus for correcting color unevenness caused by variations in the intensity of light transmitted through three liquid crystal panels that respectively form red, green, and blue images. In addition, the image capturing unit corresponding to green and blue is provided, and luminance data of each block when the projection image is divided into a plurality of blocks is acquired according to the imaging result of each image capturing unit, and color unevenness is corrected using this. Is.

  In the apparatus disclosed in Patent Document 1, a black image is first displayed from a projector, and red, green, and blue luminance data for the displayed black image is acquired from an imaging unit. Subsequently, the apparatus displays a white image from the projector, and acquires red, green, and blue luminance data for the white image from the imaging unit in the same manner as when the black image is displayed.

  When a camera is used as an imaging unit that acquires luminance data of each block, luminance data corresponding to each block in the captured image is obtained. In addition, when a luminance meter is used as the imaging unit, a detection value when images are sequentially projected on each block is used.

  Thereafter, the apparatus calculates the luminance difference of each block from the luminance data for the white image and the black image. Then, color unevenness correction data in which the adjustment value of the intensity of transmitted light of each liquid crystal panel is indicated for each block so that the luminance in the projected image is uniform is created based on the calculated luminance difference.

  The color unevenness correction data is superimposed on the input video signal of each color as a red, green, and blue color unevenness correction signal and is input to each liquid crystal panel. Each liquid crystal panel modulates red light, green light, and blue light based on the input signal.

In the apparatus described in Patent Document 1, luminance data of each block when a projected image is divided into a plurality of blocks is acquired from an imaging unit, and color unevenness correction data created based on the luminance data is transmitted through each liquid crystal panel. Used to adjust strength. Thereby, the intensity of the transmitted light of each liquid crystal panel is made uniform, and the color unevenness can be corrected.
JP-A-10-84551

  When a projector having three liquid crystal panels projects an image, generally, white light is separated into red, green, and blue color light by a plurality of optical filters (dichroic mirrors) each having a different wavelength transmission region, Each color light is incident on each liquid crystal panel. Thereby, the wavelength region of the projection light of each color (transmitted light of each liquid crystal panel) is determined according to the wavelength transmission region of each optical filter provided in the projector.

  The camera used to acquire the brightness data of the projected image has a plurality of optical filters that separate the image light obtained by capturing the projected image into red, green, and blue image lights in different wavelength regions, and transmits each optical filter. In general, a plurality of image sensors that individually detect the intensity of the image light is provided. Thereby, the wavelength region of the image light of each color is determined according to the wavelength transmission region of each optical filter provided in the camera.

  When correcting uneven color using a camera, a projector usually displays a color composite image (white image or gray image) by simultaneous irradiation of light transmitted through each liquid crystal panel, and each image sensor for that color composite image is displayed. The intensity of the projection light is adjusted based on the detection value. At this time, the intensity of the red projection light is adjusted based on the detection value of the image sensor that receives the red image light. Similarly to the case of red, the intensity of green and blue projection light is also adjusted based on the detection value of the image sensor that receives the image light of each color.

  In addition, when correcting color unevenness, each liquid crystal panel has non-uniform transmittance variation with respect to the applied voltage, so the state of color unevenness is a gradation (the intensity of the projected light corresponds to the applied voltage to the liquid crystal panel). In general, images having different gradations are respectively projected and detection values of the image sensor for the respective images are acquired.

  FIG. 4 is a diagram illustrating an example of optical characteristics regarding the projection light of the projector and the optical filter of the camera.

  In FIG. 4, a solid line 401 indicates the transmittance of the optical filter corresponding to each of red, green, and blue in association with the wavelength region of each color. On the other hand, a dotted line 402 indicates the intensity of the projection light corresponding to red, green, and blue in association with the wavelength region of each color.

  As shown in FIG. 4, regarding the projection light and the optical filter of the camera, when there is a difference in the correspondence relationship between the color and the wavelength region, the image light received by each image sensor includes a plurality of color components. For this reason, a plurality of color components are included in the detection value of each image sensor, and correction of color unevenness using the detection value as it is does not correct the correction.

  When the luminance meter is used, the above problem does not occur, but it takes time because it is necessary to measure each color.

  As one means for solving the above problems when using a camera, a single color image of red, green, and blue is individually projected from a projector in the same manner as in the case of a luminance meter, and each image sensor for each single color image is projected. A method of correcting color unevenness based on the detection value is conceivable. According to this method, since the projector displays an image using one of red, green, and blue projection light, the image light received by each image sensor should not include a plurality of color components. it can.

  However, when the above method is used, it takes time as in the case of the luminance meter. The length of the measurement time is accumulated by the number of gradations to be measured, which causes a problem that a lot of time is required.

  An object of the present invention is to provide a projection type image display apparatus, an image display system, and a color unevenness correction method capable of solving the above-described problems and correcting color unevenness with high accuracy and speed. is there.

In order to achieve the above object, a projection-type image display device according to the present invention provides:
A projection-type image that projects an image of a plurality of color lights with a predetermined gradation and corrects color unevenness for each of a plurality of regions of the projected image using the imaging results of a plurality of image sensors corresponding to each of the plurality of color lights. A display device,
When a single color image of a plurality of color lights is sequentially projected as the projection image, a detection value for a corresponding color light and a detection value for a color light not corresponding to each imaging element are acquired, and the predetermined value is used by using the acquired value. A control unit that obtains a correction value output from the image sensor corresponding to the color light of gradation, and creates an adjustment value for adjusting an image signal of a plurality of gradations based on the correction value;
A memory for storing the adjustment value;
Have

Further, a projection type image display device according to the present invention for achieving the above object is
A projection-type image display device that projects an image of a plurality of color lights with a predetermined gradation, captures a projection image, and corrects color unevenness for each of a plurality of regions of the projection image,
A plurality of image sensors corresponding to each of the plurality of color lights;
When a single color image of a plurality of color lights is sequentially projected as the projection image, a detection value for a corresponding color light and a detection value for a color light not corresponding to each imaging element are acquired, and the predetermined value is used by using the acquired value. A control unit that obtains a correction value output from the image sensor corresponding to the color light of gradation, and creates an adjustment value for adjusting an image signal of a plurality of gradations based on the correction value;
A memory for storing the adjustment value;
Have

An image display system according to the present invention for achieving the above object is
A projection-type image display device that projects an image of a plurality of color lights with a predetermined gradation and corrects color unevenness for each of a plurality of regions of the projection image using an imaging result of the projection image;
An imaging device for capturing the projected image;
Comprising
The imaging apparatus has a plurality of imaging elements corresponding to the plurality of color lights,
The projection-type image display device acquires detection values for corresponding color lights and detection values for non-corresponding color lights of each image sensor when sequentially projecting a single color image of a plurality of color lights as the projection image. A control unit that uses the value to obtain a correction value that is output by the image sensor corresponding to the color light of the predetermined gradation and creates an adjustment value that adjusts an image signal of a plurality of gradations based on the correction value And a memory for storing the adjustment value.

In addition, the color unevenness correction method according to the present invention for achieving the above object is as follows:
A method for correcting color unevenness for each of a plurality of regions of a projected image using a plurality of imaging elements corresponding to each of the plurality of colored lights, with respect to a projected image of a plurality of colored lights having a predetermined gradation. Because
A single color image of a plurality of color lights is sequentially projected as the projection image, and a detection value for the corresponding color light and a detection value for the non-corresponding color light of each imaging element are acquired for the single color image, and the acquired value is used. Then, a correction value output from the image sensor corresponding to the color light of the predetermined gradation is obtained, and an adjustment value for adjusting the image signals of a plurality of gradations is created based on the correction value.

  According to the present invention, the control unit does not use the detection value of each image sensor as it is, but calculates a correction value in which each color light is individually associated using the detection value of each image sensor with respect to a monochromatic image, and the correction value. An adjustment value for adjusting the image signal is created based on the above. Since the correction value does not include an incompatible color light component, an adjustment value can be created after accurately understanding the state of color unevenness. This makes it possible to correct color unevenness with high accuracy.

  Further, in the present invention, when the control unit creates the adjustment value, the display time of the monochrome image is limited to one gradation, so that the measurement time is shortened. This makes it possible to correct color unevenness quickly.

  Embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration example of a projection type image display apparatus 1 according to the present embodiment.

  As shown in FIG. 1, the projection-type image display device 1 includes an image projection unit 10 that projects an image onto a screen 100 according to an image signal indicating image data, a control unit 11 that is connected to the imaging device 2, and a projection. And an operation unit 13 provided with a key for operating the pattern image display device 1. In the present embodiment, the imaging device 2 is installed at a position where the projection image displayed on the screen 100 by the projection type image display device 1 can be captured when the projection type image display device 1 is manufactured.

  First, the configuration of the image projection unit 10 will be described.

  The image projection unit 10 includes image signal processing units 101, 102, and 103, image display elements 104, 105, and 106, a color synthesis element 107, a projection lens 108, a light source unit 109, and a color separation optical system 110. And having.

  The light source unit 109 irradiates the color separation optical system 110 with white light.

  The color separation optical system 110 includes a plurality of dichroic mirrors that separate white light incident from the light source unit 109 into red light, green light, and blue light having different wavelength regions. The red light is incident on the image display element 104. The green light is incident on the image display element 105. Blue light is incident on the image display element 106.

  The image signal processing unit 101 includes a memory 111. In the memory 111, an adjustment value (increase / decrease value of the voltage applied to the image display element 104) of the intensity of the transmitted light (red projection light) of the image display element 104 is stored in each grid when the projection image is divided into grids, And red light correction data corresponding to the respective gradations are stored.

  When a red image signal indicating red image data is input, the image signal processing unit 101 corrects the red image signal using the red light correction data, and the red image correction signal, which is the corrected signal, is displayed on the image display element 104. Output to.

  The image signal processing unit 102 includes a memory 112. The memory 112 stores green light correction data indicating the adjustment value of the intensity of the transmitted light (green projection light) of the image display element 105 in association with the lattice and the gradation.

  When a green image signal indicating green image data is input, the image signal processing unit 102 corrects the green image signal using the green light correction data, and the corrected green image correction signal is output to the image display element 105. Output to.

  The image signal processing unit 103 includes a memory 113. The memory 113 stores blue light correction data indicating the adjustment value of the intensity of the transmitted light (blue projection light) of the image display element 106 in association with the lattice and the gradation.

  When a blue image signal indicating blue image data is input, the image signal processing unit 103 corrects the blue image signal using the blue light correction data, and the blue image correction signal, which is the corrected signal, is displayed on the image display element 106. Output to.

  The image display elements 104, 105, and 106 are optical devices typified by a liquid crystal panel (liquid crystal light valve), and the image display element 104 modulates red light based on a red image correction signal. The image display element 105 modulates the green light source light based on the green image correction signal. The image display element 106 modulates blue light based on the blue image correction signal.

  The transmitted light of each image display element enters the color composition element 107 and is synthesized by the color composition element 107. The light synthesized by the color synthesis element 107 enters the projection lens 108. And the light which permeate | transmitted the projection lens 108 is projected on the screen 100, and an image will be displayed.

  The control unit 11 has a memory 14 and controls the operation of the image projection unit 10, acquires values detected by the imaging device 2, and obtains red light correction data, green light correction data, and blue light correction data. create. A value acquired from the imaging device 2 is stored in the memory 14.

  Next, the configuration of the imaging device 2 will be described.

  The imaging device 2 includes a lens 21, an optical filter 22, and imaging elements 23, 24, and 25.

  In the imaging device 2, image light obtained by photographing the projection image is transmitted through the lens 21 and is incident on the optical filter 22.

  The optical filter 22 includes a plurality of optical filters each having a different wavelength transmission region in association with red, green, and blue. In the optical filter 22, the image light transmitted through the lens 21 is separated into red image light, green image light, and blue image light having different wavelength regions.

  The image sensors 23, 24, and 25 are two-dimensional area sensors typified by a CCD (Charge Coupled Device) area sensor, and receive red image light, green image light, and blue image light transmitted through the optical filter 22, respectively. Each image sensor is associated with projection light of each color in accordance with the received image light.

  In the present embodiment, the image sensor 23 receives red image light, the image sensor 24 receives green image light, and the image sensor 25 receives blue image light. That is, the image sensor 23 is associated with red projection light, the image sensor 24 is associated with green projection light, and the image sensor 25 is associated with blue projection light.

  Further, when receiving image light, the image sensors 23, 24, and 25 divide the projection image into a plurality of grids, detect the intensity of the image light in each grid, and set the detection value in each grid to the position of the projection image. The optical detection signals sequentially shown in association with each other are output to the control unit 11.

  Next, an operation for storing correction data in the memories 111 to 113 in the image signal processing units 101 to 103 in the present embodiment will be described. The correction data is stored when the projection type image display apparatus 1 is manufactured. FIG. 2 is a flowchart showing the operation.

  First, the control unit 11 causes the image projection unit 10 to output a single color image (a red single color image, a green single color image, or a single color image) of each color projection light in any one of a plurality of predetermined gradations (correction gradations). A blue monochromatic image) is sequentially projected onto the screen 100 (step S1). Specifically, an image signal corresponding to each monochromatic image is input from the control unit 11 to the image display elements 104 to 106 through the image signal processing units 101 to 103, and each image display element receives each color light based on the image signal. Modulate.

  The number of correction gradations is not particularly limited as long as it is two or more, but in the present embodiment, the correction gradations are set to four, and gradation A and gradation B are respectively set. , Gradation C and gradation D. In the present embodiment, it is assumed that a single color image of gradation A is set to be projected.

  Each time each monochrome image is projected onto the screen 100, the image sensors 23, 24, and 25 detect the intensity of the image light of each color that has passed through the optical filter 22 for each lattice, and send a light detection signal to the control unit 11. Output each. Then, the control part 11 acquires all the detection values (monochromatic image detection values) of the image sensors for the monochromatic images from the photodetection signals (step S2).

  The control unit 11 calculates a monochrome image correction value for each color based on the acquired monochrome image detection value (step S3).

  Here, the operation of step S3 is extracted from the flowchart shown in FIG. 2 and described in detail.

  FIG. 3 is a diagram for explaining a method of calculating a monochrome image correction value.

  The detection result 311 shows an example of a monochromatic image detection value of the image sensor 23 for a plurality of positions (lattices) in the red monochromatic image.

  In addition, the detection result 321 and the detection result 331 respectively show examples of monochromatic image detection values of the image sensors 24 and 25 at the same position as the detection result 311 in the red monochromatic image.

  The detection results 312, 322, and 332 respectively show examples of monochromatic image detection values of the image sensors 23, 24, and 25 for the same position as the detection result 311 in the green monochromatic image.

  The detection results 313, 323, and 333 show examples of monochromatic image detection values of the image sensors 23, 24, and 25 at the same position as the detection result 311 in the blue monochromatic image, respectively.

  Here, the monochromatic image detection values of the imaging elements 23, 24, and 25 in the lattice α (not shown) corresponding to one of the positions indicated by the detection result 311 are, for example, X1, Y1, Z1, X2, Y2, and Z2 for a green monochrome image, and X3, Y3, and Z3 for a blue monochrome image, respectively.

  The control unit 11 calculates a red monochromatic image correction value, which is a value obtained by correcting the monochromatic image detection value for the red monochromatic image of the imaging element corresponding to the red projection light, using the following equation (1).

  Subsequently, the control unit 11 calculates a green monochromatic image correction value, which is a value obtained by correcting the monochromatic image detection value for the green monochromatic image of the image sensor corresponding to the green projection light, using the following equation (2).

  Subsequently, the control unit 11 calculates a blue monochromatic image correction value, which is a value obtained by correcting the monochromatic image detection value for the blue monochromatic image of the imaging element corresponding to the blue projection light, using the following equation (3).

X11 = X1 + a * Y1 + b * Z1 (1)
Y22 = Y2 + c * X2 + d * Z2 (2)
Z33 = Z3 + e * X3 + f * Y3 (3)
The red monochromatic image correction value X11 is a value indicating the actual intensity of red light in the lattice α in the red monochromatic image of gradation A. If the projected light and the image light received by each image sensor do not match the wavelength regions corresponding to red, green, and blue, the image light of the red single-color image can be obtained only by the image sensor corresponding to the red projection light. However, it is also received by an image sensor that does not support red projection light.

  Therefore, the red monochromatic image correction value X11 is set as a detection value of the image sensor corresponding to the red projection light by adding the monochromatic image detection value for the grid α of the red monochromatic image of the image sensor not corresponding to the red projection light. At this time, since each image sensor receives image light through different optical filters, the amount of light received by the image sensor that does not correspond to red projection light, even if it is red light of the same intensity, is red projection light. This is different from the amount of light received by the image sensor corresponding to. The coefficients a and b are coefficients for making these light quantities uniform.

  The green monochrome image correction value Y22 is a value indicating the actual intensity of green light in the lattice α in the green monochrome image of gradation A. Similarly to the red monochromatic image correction value X11, the green monochromatic image correction value Y22 is a coefficient corresponding to the coefficients a and b for the monochromatic image detection value for the grid α of the green monochromatic image of the image sensor that does not support green projection light. Values obtained by multiplying c and d are added to obtain a detection value of the image sensor corresponding to the green projection light.

  The blue monochromatic image correction value Z33 is a value indicating the actual intensity of blue light in the lattice α in the blue monochromatic image of gradation A. Similarly to the red monochromatic image correction value X11, the blue monochromatic image correction value Z33 is also a coefficient e corresponding to the coefficients a and b as the detection value for the grid α of the blue monochromatic image of the image sensor that does not support blue projection light. A value obtained by multiplying each of f is added to obtain a detection value of the image sensor corresponding to the blue projection light.

  When the control unit 11 calculates the single-color image correction value for each color for the grid corresponding to each of the positions indicated by the detection result 311, the detection result 311 becomes the correction result 301, the detection result 312 becomes the correction result 302, and the detection result 313 is corrected to the correction result 303, respectively.

  When the control unit 11 calculates all the monochrome image correction values for all the grids in the monochrome image for each of red, green, and blue, the control unit 11 sets the adjustment value corresponding to the gradation A based on the calculated monochrome image correction value. Create (step S4). At this time, adjustment values are created for each color for each grid so that the intensity of each color light is uniform in the gradation A image.

  The control unit 11 supplies adjustment values associated with gradations and grids created for each color to the image signal processing units 101, 102, and 103, respectively (step S5). Each image signal processing unit stores the supplied adjustment value in the memory in each image signal processing unit in association with the gradation and the grid (step S6).

  Next, the control unit 11 causes the image projection unit 10 to project a color composite image (gray image) by simultaneous irradiation of projection light of each color in the gradation B onto the screen 100 (step S7). Specifically, an image signal corresponding to the color composite image is input from the control unit 11 to the image display elements 104 to 106 through the image signal processing units 101 to 103, and each image display element receives each color light based on the image signal. Modulate.

  Subsequently, the control unit 11 acquires all the detection values (color composite image detection values) of the imaging elements 23, 24, and 25 for the color composite image in the same manner as the operation of Step S2 (Step S8).

  The control unit 11 calculates a color composite image correction value for each color based on the acquired color composite image detection value (step S9).

  Here, the operation of step S9 will be described in detail.

  If the color composite image detection values of the image sensors 23, 24, and 25 corresponding to the lattice α are U1, V1, and W1 among the color composite image detection values acquired by the control unit 11, the control unit 11 displays red projection light. A red composite image correction value that is a value obtained by correcting the color composite image detection value of the image sensor corresponding to is calculated using the following equation (4).

  Subsequently, the control unit 11 calculates a green composite image correction value, which is a value obtained by correcting the color composite image detection value of the image sensor corresponding to the green projection light, using the following equation (5).

  Subsequently, the control unit 11 calculates a blue composite image correction value, which is a value obtained by correcting the color composite image detection value of the image sensor corresponding to the blue projection light, using the following equation (6).

U11 = U1- (p * X2)-(q * X3) + n * (a * Y1 + b * Z1) (4)
V11 = V1- (n * Y1)-(q * Y3) + p * (c * X2 + d * Z2) (5)
W11 = W1- (n * Z1)-(p * Y3) + q * (e * X3 + f * Y3) (6)
n = U1 / (X1 + X2 + X3) (7)
p = V1 / (Y1 + Y2 + Y3) (8)
q = W1 / (Z1 + Z2 + Z3) (9)
The red composite image correction value U11 is a value indicating the actual intensity of red light in the lattice α in the color composite image of gradation B. If the wavelength region corresponding to each color does not match between the projection light and the image light received by each image sensor, the image light of the color composite image received by each image sensor has components other than the corresponding color. Is also included.

  Therefore, the red composite image detection value U11 subtracts the monochrome image detection value for the lattice α of the monochrome image other than the red projection light of the image sensor corresponding to the red projection light, and the red color of the image sensor that does not correspond to the red projection light. Monochromatic image detection values for the monochromatic image lattice α are added to form a detection value composed of only the red component. At this time, the monochromatic image detection value of the image sensor not corresponding to the red projection light is multiplied by the coefficients a and b for the reason described above.

  In addition, since the single color image detection value and the color composite image detection value are detection values for images having different gradations, if the single color image detection value is used as it is, the color composite image correction value will not be accurate. Each of the coefficients n, p, and q is a value for converting the detection value of each imaging element for the red monochrome image, the green monochrome image, and the blue monochrome image of gradation A into the detection value for each monochrome image of gradation B. It is.

  The green composite image correction value V11 is a value indicating the actual green light intensity in the lattice α in the color composite image of gradation B.

  Similarly to the red composite image correction value U11, the green composite image correction value V11 is also subtracted from the single-color image detection value for the lattice α of the single-color image other than the green projection light of the image sensor corresponding to the green projection light, to the green projection light. Monochromatic image detection values for the grid α of the green monochromatic image of the imaging element that is not supported are added to obtain a detection value composed of only the green component.

  Similarly to the red composite image correction value U11, the green composite image correction value V11 is multiplied by coefficients n, p, and q corresponding to each color for the single color image detection value, and further the green projection light. The monochrome image detection values of the image sensor that do not correspond to are multiplied by coefficients c and d corresponding to the coefficients a and b, respectively.

  The blue composite image correction value W11 is a value indicating the actual intensity of blue light in the lattice α in the color composite image of gradation B.

  Similarly to the red composite image correction value U11, the blue composite image correction value W11 is also subtracted from the single color image detection value for the lattice α of the single color image other than the blue projection light of the image pickup element corresponding to the blue projection light, and the blue projection light is subtracted. Monochromatic image detection values for the lattice α of the blue monochromatic image of the imaging element that is not supported are added to obtain a detection value composed of only the blue component.

  Similarly to the red composite image correction value U11, the blue composite image correction value W11 is multiplied by coefficients n, p, and q corresponding to each color for the single color image detection value, and further the blue projection light The monochromatic image detection value of the image sensor that does not support is multiplied by coefficients e and f corresponding to the coefficients a and b, respectively.

  When the control unit 11 calculates all the color composite image correction values for all of the grids in the color composite image for each of red, green, and blue, the control unit 11 corresponds to the gradation B based on the calculated color composite image correction value. An adjustment value is created (step S10). This adjustment value is also created for each color for each grid in the same manner as when the adjustment value corresponding to the gradation A is created.

  The control unit 11 supplies adjustment values associated with gradations and grids created for each color to the image signal processing units 101, 102, and 103, respectively (step S11). Each image signal processing unit stores the supplied adjustment value in the memory in each image signal processing unit in association with the gradation and the grid (step S12).

  Note that the control unit 11 projects a color composite image for gradation C and gradation D as in the case of gradation B, obtains a color composite image detection value, and sets a color composite image correction value for each color. calculate. Then, the control unit 11 creates adjustment values corresponding to the gradation C and the gradation D, and supplies them to the image signal processing units. Each image signal processing unit stores the supplied adjustment value in a memory in each image signal processing unit in association with a gradation and a grid.

  The projection type image display apparatus 1 is shipped in a state where the red light correction data, green light correction data, and blue light correction data created as described above are stored in the memories 111 to 113, respectively.

  After each correction data is stored in the memories 111 to 113, when the projection type image display device 1 projects an image, the image signal processing unit 101 converts the red image signal into an image display element based on the red light correction data. The applied voltage to 104 is converted into a red image correction signal that is increased or decreased in association with each gradation and each grid in the projected image, and the image display element 104 modulates red light based on the red image correction signal. Thereby, the intensity of the red projection light is made uniform.

  Similarly to the image signal processing unit 101, the image signal processing unit 102 converts the green image signal into a green image correction signal based on the green light correction data, and the image signal processing unit 103 converts the blue image signal into the blue light. A blue image correction signal is converted based on the correction data. The image display element 105 modulates green light based on the green image correction signal, and the image display element 106 modulates blue light based on the blue image correction signal. Thereby, the intensity | strength of green projection light and blue projection light is also each equalized.

  Since the intensity of the projection light of each color is made uniform, an image having uniform brightness, that is, an image having no color unevenness is displayed from the projection type image display device 1.

  Note that when a gradation (a gradation other than gradations A to D) for which no correction value has been calculated is indicated in the image signal, the control unit adjusts the gradation using the created adjustment value. A value is calculated, and the voltage applied to each image display element is adjusted based on the adjustment value.

  In the present embodiment, the control unit 11 does not use the detection values of the image sensors 23, 24, and 25 as they are, but acquires all the single-color image detection values and the color composite image detection values, and uses each detection value to obtain a plurality of detection values. A correction value for each gradation is calculated, an adjustment value is created based on each correction value, and stored in the memories 111 to 113. Since the correction value does not include color light components that do not correspond as described above, it is possible to create an adjustment value after accurately grasping the state of color unevenness. This makes it possible to correct color unevenness with high accuracy.

  Further, in the present embodiment, when the control unit 11 creates the adjustment value, the display of the monochromatic image is limited to one gradation, so that the measurement time is shortened. This makes it possible to correct color unevenness quickly.

  Note that the color composite image may be projected before the single color image, and the color composite image detection value may be stored in the memory 14 in the control unit 11. At this time, when the control unit 11 projects a single color image and acquires a single color image detection value, the control unit 11 calculates a single color image correction value and a color composite image correction value, respectively. Even in this case, since the display of the monochromatic image is limited to one gradation, the measurement time is shortened.

  Further, the present invention is not limited to the configuration in which the projection type image display device 1 and the imaging device 2 are separated as in the above-described embodiment, and the projection type image display device 1 and the imaging device 2 are integrated. You may make it the structure which carried out. Even if it does in this way, since the operation | movement of each structure is the same, there exists an effect similar to the case where the projection type image display apparatus 1 and the imaging device 2 are set as a separate structure.

  When the projection type image display apparatus 1 and the imaging apparatus 2 are integrated, a function for measuring the usage time is added to the control unit 11, and the above-described color unevenness correction is performed every time a predetermined time elapses. You may decide to do it. In this case, even when the color unevenness occurs during actual use, the color unevenness can be periodically eliminated.

  Alternatively, it may be performed when a control signal for correcting color unevenness is input to the control unit 11 from an external device such as a personal computer. Alternatively, it may be performed when the control unit 11 confirms a key input for correcting color unevenness in the operation unit 13. In this case, it is possible to eliminate the color unevenness when the user notices the occurrence of the color unevenness.

It is a block diagram which shows the example of 1 structure of the projection type image display apparatus of this embodiment. It is a flowchart which shows the operation | movement which stores the correction data by the projection type image display apparatus of this embodiment. It is a figure for demonstrating the calculation method of a monochrome image correction value. It is a figure which shows an example of the optical characteristic regarding the projection light of a projector, and the optical filter of a camera.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projection-type image display apparatus 2 Imaging apparatus 10 Image projection part 11 Control part 21 Lens 22 Optical filter 23, 24, 25 Image pick-up element 100 Screen 101, 102, 103 Image signal processing part 104, 105, 106 Image display element 107 Color composition Element 108 Projection lens 109 Light source 110 Color separation optical system

Claims (12)

A projection-type image that projects an image of a plurality of color lights with a predetermined gradation and corrects color unevenness for each of a plurality of regions of the projected image using the imaging results of a plurality of image sensors corresponding to each of the plurality of color lights. A display device,
When a single color image of a plurality of color lights is sequentially projected as the projection image, a detection value for a corresponding color light and a detection value for a color light not corresponding to each imaging element are acquired, and the predetermined value is used by using the acquired value. A control unit that obtains a correction value output by the image sensor corresponding to the color light of gradation, and creates an adjustment value for adjusting an image signal of a plurality of gradations based on the correction value;
A memory for storing the adjustment value;
A projection-type image display device. A projection-type image display device that projects an image of a plurality of color lights with a predetermined gradation, captures a projection image, and corrects color unevenness for each of a plurality of regions of the projection image,
A plurality of image sensors corresponding to each of the plurality of color lights;
When a single color image of a plurality of color lights is sequentially projected as the projection image, a detection value for a corresponding color light and a detection value for a color light not corresponding to each imaging element are acquired, and the predetermined value is used by using the acquired value. A control unit that obtains a correction value output by the image sensor corresponding to the color light of gradation, and creates an adjustment value for adjusting an image signal of a plurality of gradations based on the correction value;
A memory for storing the adjustment value;
A projection-type image display device. In the projection type image display device according to claim 1 or 2,
The control unit sets an adjustment value for each of a plurality of predetermined gradations different from the gradation of the single-color image, the acquired value for the single-color image, and the plurality of predetermined gradations. A projection-type image display device that is created using detection values of the plurality of image sensors when color light is simultaneously irradiated. In the projection type image display device according to claim 3,
The said control part is a projection type image display apparatus which calculates the adjustment value corresponding to the gradation for which the said adjustment value is not calculated | required using the adjustment value stored in the said memory. In the projection type image display device according to claim 3,
The control unit subtracts the detection value of the image sensor for a single color image of color light that does not correspond to the image sensor that detected the detection value from the detection value for the color composite image of the plurality of image sensors. A projection-type image display device that obtains a correction value corresponding to the color composite image by adding detection values of image sensors other than the image sensor to a single color image of the color light to be obtained. In the projection type image display device according to any one of claims 1 to 5,
The said control part is a projection type image display apparatus which calculates | requires the correction value with respect to the said monochrome image by each adding the same acquired value with the corresponding monochrome image. A projection-type image display device that projects an image of a plurality of color lights with a predetermined gradation and corrects color unevenness for each of a plurality of regions of the projection image using an imaging result of the projection image;
An imaging device for capturing the projected image;
Comprising
The imaging apparatus has a plurality of imaging elements corresponding to the plurality of color lights,
The projection-type image display device acquires detection values for corresponding color lights and detection values for non-corresponding color lights of each image sensor when sequentially projecting a single color image of a plurality of color lights as the projection image. A control unit that uses the value to obtain a correction value that is output by the image sensor corresponding to the color light of the predetermined gradation and creates an adjustment value that adjusts an image signal of a plurality of gradations based on the correction value And a memory for storing the adjustment value. A method for correcting color unevenness for each of a plurality of regions of a projected image using a plurality of imaging elements corresponding to each of the plurality of colored lights, with respect to a projected image of a plurality of colored lights having a predetermined gradation. Because
A single color image of a plurality of color lights is sequentially projected as the projection image, and a detection value for the corresponding color light and a detection value for the non-corresponding color light of each imaging element are acquired for the single color image, and the acquired value is used. A correction value output from the imaging device corresponding to the color light of the predetermined gradation is obtained, an adjustment value for adjusting an image signal of a plurality of gradations is created based on the correction value, and the adjustment value is stored Color unevenness correction method. The color unevenness correction method according to claim 8,
An adjustment value for each of a plurality of predetermined gradations different from the gradation of the monochrome image is simultaneously irradiated with the acquired values for the monochrome image and the plurality of color lights at the plurality of predetermined gradations. A method for correcting color unevenness, which is created by using detection values of the plurality of imaging elements at the time. The color unevenness correction method according to claim 9,
An uneven color correction method for calculating an adjustment value corresponding to a gradation for which no adjustment value has been created using a stored adjustment value. The color unevenness correction method according to claim 9,
The detection values of the image sensor for the single color image of the color light that does not correspond to the image sensor that detected the detection value are subtracted from the detection values for the color composite image of the plurality of image sensors, respectively, and the single color image of the corresponding color light An uneven color correction method for obtaining correction values corresponding to the color composite image by adding detection values of image sensors other than the image sensor to The color unevenness correction method according to any one of claims 8 to 11,
An uneven color correction method for obtaining a correction value for a single color image by adding the same acquired values for corresponding single color images.

Images