JP3982241B2 - Automatic positioning method and apparatus for color tone composition - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color tone adjustment and apparatus for adjusting the color tone of a liquid crystal panel of an optical system of a projection display device, and in particular, to adjust the position of the liquid crystal panel by analyzing an image captured by moving the optical axis position of the liquid crystal panel. The present invention relates to an automatic positioning method and apparatus for color tone synthesis.
[0002]
[Prior art]
In general, a liquid crystal projector creates a monochromatic image using three liquid crystal panels of red, green, and blue, and creates a projected image by combining colors of red, green, and blue monochromatic images on a dichroic prism.
In the positioning adjustment process for color tone composition of the liquid crystal projector, the projected image in green with the clearest color contrast is used as the reference position, the edge of the contour in the imaging range of the green projection image is at a right angle, and the projection in the adjacent imaging area Adjustment is made so that the area of the image area and the line that separates the projection pixels match as much as possible. Similarly, the same adjustment is made for the red and blue projection images, and the red and blue images are superimposed on the position that most closely matches the green projection image position that was initially adjusted, and each projection pixel position of the red and blue images with respect to green is superimposed. However, it is necessary to adjust the position of the liquid crystal panel for each color at a position where the color misregistration is minimized.
[0003]
In the conventional automatic positioning adjustment of tone synthesis, first, a green image serving as a reference is projected onto a screen serving as a projection surface, and the four corners of the projected image on the screen are captured by a color camera. Next, an image obtained by integrating the four captured images is displayed on a CRT monitor, and focus adjustment is performed. Thereafter, the liquid crystal panel mounted on the liquid crystal projector is projected so that the corner positions of the projection corners and the edge areas of the projection areas are projected to predetermined positions while the operator visually confirms the corner positions of the projection pixels on the CRT. The optical axis was adjusted.
[0004]
To adjust the optical axis of the liquid crystal panel, first, focus adjustment is performed so that the contrast of the projected image is the clearest. Subsequently, the three axes of the position X of the liquid crystal panel, the position Y in the Y-axis direction, and the rotation angle θ in the normal direction passing through the center of the panel plane are adjusted. These adjustments are performed by driving a six-axis manipulator including three optical axes, that is, the positions X, Y, and Z of the liquid crystal panel and the rotation angle θ on the Z axis. By these adjustments, the color composition projection position of the liquid crystal panel, which is optically determined uniquely, can be determined by the positional relationship of the three axes in the preset imaging region.
[0005]
Color tone composition positioning adjustment is performed for each of the three liquid crystal panels of red, green, and blue, and after determining the color composition projection position of the liquid crystal panel for each color, the three colors are selected based on the green (G) color position. In the case of simultaneous projection, the liquid crystal panel is joined to the optical unit so that the projection pixel positions of the respective colors overlap most, and the adjustment is completed. As a related technique, for example, there is one described in Japanese Patent Laid-Open No. 2000-147694. Here, the projected pixels on the screen are imaged with a camera, the brightness is totaled, Coarse After the dynamic adjustment and fine adjustment, the luminance integration peak is obtained, and the convergence adjustment is made to the position of the liquid crystal light valve in the X, Y, and θ axis directions when the image with the smallest positional deviation of the projected pixel of each color projection image is captured. An automatic technique is disclosed.
[0006]
[Problems to be solved by the invention]
However, since the brightness of the blue and red luminance values and the visual appearance differ with the naked eye due to the difference in the visual sensitivity between the camera sensitivity and the naked eye, the camera brightness setting must be set when imaging and adjusting with the camera as described above. It is difficult to set appropriately, and in actual color composition positioning (hereinafter referred to as convergence adjustment), it is necessary to check the image projected on the screen not only with the camera but also with the naked eye, which requires a lot of man-hours. There was a problem.
[0007]
Furthermore, with the above-described conventional technology, the original property of luminance dispersion of the projected pixels is difficult to appear in the projected image on the screen due to the influence of the external light of the surrounding environment being adjusted or the reflected light from the projection surface. There was also. In particular, in the case of blue with very poor visibility, even if automatic adjustment of the reference projection position is performed, the synthesized image of the corner end points of the projected image is the least distorted, and the operator has virtually decided within the projection pixel. It has been difficult to accurately align the optical axis position with a reference position (hereinafter referred to as an observation adjustment position).
[0008]
The present invention has been made to solve the above-described problems, and can appropriately set the luminance setting of an image captured by the camera regardless of the difference in visibility between the camera sensitivity and the naked eye. Another object of the present invention is to provide a color tone composition positioning adjustment method and apparatus capable of accurately adjusting the optical axis position to a position where the color deviation of the projection optical system is the smallest by performing the color tone positioning automatic adjustment.
[0009]
[Means for Solving the Problems]
According to an aspect of the present invention, there is provided an automatic positioning apparatus for color composition combining optical axis positions of a plurality of liquid crystal panels in order to synthesize a plurality of images formed by passing through the plurality of liquid crystal panels into one projection image. A color tone automatic positioning and adjustment device for adjusting a color tone, an image pickup means for picking up a projected image as an image by moving the optical axis position of the liquid crystal panel in the X, Y, and θ directions, and an image picked up by the image pickup means A pseudo monochrome image generation unit that generates pseudo monochrome image data indicating the light intensity distribution on the projection plane of the projected video, and a corner search that extracts the position of the corner portion in the pseudo monochrome image data generated by the pseudo monochrome image generation unit And four corners of the projected image are guided to a predetermined position range of the imaging range from the corner position information obtained by the corner search section Coarse The center pixel position of the 3 × 3 projection pixel region including the adjustment unit and the apex portions in the four corner portions that have entered the predetermined region is obtained based on the peak position of the luminance integration, and the optical position within the captured projection image range is determined. A fine adjustment unit that guides the corner position within a predetermined adjustment reference position of the projector optical unit, Coarse An adjustment unit and an optical axis adjustment mechanism unit that moves the liquid crystal panel to the optical axis position determined by the fine adjustment unit are provided.
According to this automatic color composition positioning apparatus, pseudo-monochrome image data that is a grayscale image close to the light intensity on the projection surface is generated, and the luminance that is independent of the color of the projected image of the image captured in this single color Regardless of the sensitivity difference between the camera sensitivity and the naked eye, the brightness of the image captured by the camera is set.
[0010]
In the automatic color tone composition positioning apparatus, for example, the pseudo monochrome image generation unit sets the luminance distribution I of the pseudo monochrome image data, and the luminance distribution of the color components of the image as R, G, and B, respectively, I = (28 × Pseudo monochrome image data is generated as R + 77 × G + 151 × B) / 256.
Further, in the automatic color tone composition positioning apparatus, a contrast image generation unit for newly enhancing the contrast of the pseudo monochrome image data is provided. Coarse The adjustment unit determines a corner observation reference position that becomes a global corner position in the pseudo monochrome image data in which the contrast is enhanced by the contrast image generation unit, and the global corner position in the projection image is determined in advance. You may make it search for the optical axis position used as the position nearest to a position.
[0011]
In the color composition automatic positioning apparatus, the contrast image generation unit may average the number of pixels in each luminance value of the pseudo monochrome image data. Further, the automatic color tone composition positioning apparatus includes, for example, a projection processing unit that performs luminance integration in a predetermined region of the projected image, and the fine adjustment unit integrates the luminance for each of the X, Y, and θ directions. The true observation reference position based on the optical characteristics existing in the vicinity of the corner position information in the pseudo monochrome image data may be determined.
[0012]
In the color composition automatic positioning device, the maximum luminance value PXmax in the X direction and the minimum luminance value PXmin in the X direction of the pseudo monochrome image data obtained by integrating the luminance in the X and Y directions by the projection processing unit, An in-area light quantity analysis unit that searches for the maximum value PYmax of the luminance integral value in the Y direction and the minimum value PYmin of the luminance integral value in the Y direction for each optical axis position in the movement direction of the moved liquid crystal panel, and a fine adjustment unit The optical axis position may be searched based on PXmax, PXmin, PYmax, and PYmin searched by the in-area light quantity analysis unit.
[0013]
According to another aspect of the present invention, there is provided an automatic positioning device for color composition combining optical axes of a plurality of liquid crystal panels in order to synthesize a plurality of images formed by passing through the plurality of liquid crystal panels into one projection image. An automatic color tone positioning device for adjusting a position, an image pickup means for picking up an image while moving an optical axis position in the X, Y, and θ directions of a liquid crystal panel, and an X direction of an image picked up by the image pickup means The difference in absolute value between the maximum value PXmax of the luminance integral value PXmin, the minimum value PXmin of the luminance integral value in the X direction, the maximum value PYmax of the luminance integral value in the Y direction and the minimum value PYmin of the luminance integral value in the Y direction has been moved. An in-area light amount analysis unit that searches for each optical axis position in the X, Y, and θ directions of the liquid crystal panel, and PXmax, PXmin, PYmax, and PYmin searched by the in-area light amount analysis unit. Accordingly, a fine adjustment unit that searches for the optical axis position from the maximum absolute value difference between the peak values for each direction, and an optical axis adjustment mechanism unit that moves the liquid crystal panel to the optical axis position searched by the fine adjustment unit It is equipped with.
[0014]
In the color composition automatic positioning apparatus, the fine adjustment unit calculates an integral value of luminance for each of the X and Y directions from the searched PXmax, PXmin, PYmax, and PYmin, and calculates the maximum and minimum values of the waveform amplitude of the calculated integrated value. A maximum value at each optical axis position in the X and Y directions may be calculated from the value, and an observation reference pixel position necessary for alignment in the projection image may be searched.
Further, in the automatic color tone positioning apparatus, the imaging means images four corners of the video, Coarse The adjustment unit may search for the optical axis position by using the observation reference pixel position optically uniquely determined at the four corners imaged by the imaging unit as the adjustment reference pixel position.
[0015]
Moreover, in the automatic positioning device for color composition, Coarse The movement amount ΔX in the X-axis direction and the movement amount Δ in the Y-axis direction of the liquid crystal panel based on the optical axis positions at the four corners searched by the adjustment unit. Y, An optical axis control unit that calculates a correction value for correcting the rotational movement amount Δθ in the normal direction of the liquid crystal panel may be provided.
Further, in the automatic color synthesizing apparatus, the image pickup means may pick up an image projected on a screen on which a white material panel having a small surface roughness is stretched.
[0016]
An automatic positioning adjustment method according to an aspect of the present invention adjusts the optical axis positions of a plurality of liquid crystal panels in order to combine a plurality of images formed by passing through the plurality of liquid crystal panels into one projection image. A method for automatically positioning and adjusting a color tone, wherein an image is captured as an image while moving an optical axis position in the X, Y, and θ directions of a liquid crystal panel, pseudo monochrome image data is generated from the captured image, and the pseudo The optical axis position is searched based on the position information of the four corners in the monochrome image data and the luminance distribution in each corner imaging region, and the liquid crystal panel is moved to the searched optical axis position.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration example of a focus adjustment device (automatic positioning device for color tone synthesis) according to an embodiment of the present invention. 2 is a plan view showing the positional relationship between the liquid crystal projector 1, the video signal generator 4, the color CCD cameras (imaging means) 3a, 3b, 3c, 3d shown in FIG. FIG. 3 is a side view showing an example of the positional relationship among the liquid crystal projector 1, the video signal generator 4, the color CCD cameras 3a, 3b, 3c, 3d and the screen 2. The color CCD cameras 3a, 3b, 3c, 3d are installed at the four corners of the image projected on the screen 2, respectively.
[0018]
FIG. 4 is an explanatory diagram showing an example of an imaging position on the screen by the color CCD cameras 3a, 3b, 3c, and 3d shown in FIG. FIG. 5 is a block diagram illustrating a configuration example of the image recognition processing unit 14 illustrated in FIG. 1. FIG. 6 is a perspective view showing an example of the positional relationship between the adjustment optical axis of the optical component of the liquid crystal projector moved by the optical axis adjustment mechanism unit 8 shown in FIG. 1 and the liquid crystal panel for each color.
[0019]
As shown in FIG. 1, the focus adjustment apparatus includes color CCD cameras 3a, 3b, 3c, and 3d, an A / D conversion circuit 11, a digital image integrator 12, an image memory 13, and an image recognition processing unit 14. And an optical axis control unit 15 and an optical axis adjustment mechanism unit 8. Although not shown in FIG. 1, an A / D conversion circuit 11 is also provided between the color CCD cameras 3b, 3c, 3d and the digital image integrator 12, as with the color CCD camera 3a.
[0020]
As shown in FIGS. 2 and 3, the color CCD cameras 3a, 3b, 3c, and 3d capture four corners of a projected image projected on the screen projection surface of the screen 2 from the liquid crystal projector 1 that is a projection display device. Placed in position. A video signal generator 4 is connected to the liquid crystal projector 1, and the liquid crystal projector 1 corresponds to the single color raster scan video provided from the video signal generator 4 and passes through a liquid crystal panel corresponding to the corresponding color. A single color projection image is projected onto the screen 2. A dark curtain tent 5 is provided to prevent light other than the projected image from the liquid crystal projector 1 and to block all the projection range of the liquid crystal projector 1 including the screen projection surface from outside light.
[0021]
As shown in FIG. 4, on the screen 2, white material panels 6a, 6b, 6c, 6d made of a material having a small surface roughness such as photo printing paper or a standard white board are stretched. Are arranged at positions where the four corners can be accommodated. The screen 2 and the white material panels 6a, 6b, 6c, 6d are installed so as to be perpendicular to the projection optical axis of the liquid crystal projector 1. For example, when a standard white board is used as the white material panels 6a, 6b, 6c, and 6d, the surface roughness is preferably 0.05 Z or less in terms of 10-point average roughness. Further, as the white material panels 6a, 6b, 6c, and 6d, for example, when using photo printing paper, it is preferable to use one having a 10-point average roughness of 0.05Z or less.
[0022]
The color CCD cameras 3a, 3b, 3c, and 3d are respectively installed at positions where the four corners of the projected images on the white material panels 6a, 6b, 6c, and 6d are sufficiently accommodated, and are placed on the white material panels 6a, 6b, 6c, and 6d. A projected image of the projected area is captured.
The A / D conversion circuit 11 performs A / D conversion on the color images captured by the color CCD cameras 3a, 3b, 3c, and 3d. A / D conversion is performed for each of red (R), green (G), and blue (B) colors that are color components of a color image.
[0023]
The digital image integrator 12 generates integrated digital image data in which color images captured by the color CCD cameras 3a, 3b, 3c, and 3d and A / D converted are integrated. The integrated digital image data generated by the digital image integrator 12 is generated for the purpose of handling four images captured by the color CCD cameras 3a, 3b, 3c, and 3d as one frame image signals, and is generated for each color component. Is done.
[0024]
The image memory 13 stores the integrated digital image data of R, G, and B colors generated by the digital image integrator 12 for each color component.
As shown in FIG. 5, the image recognition processing unit 14 performs projection value calculation processing with a pseudo monochrome image generation unit 16, a contrast image generation unit 17, a corner search unit 18, and a projection processing unit 19 that perform image recognition processing. An in-area light quantity analysis unit 20, a projected video operation planning unit 21, and an optical axis movement calculation unit 22 are provided. In addition, the projected video operation planning unit 21 Coarse An adjustment unit 21a and a fine adjustment unit 21b are provided.
[0025]
The pseudo monochrome image generation unit 16 uses the luminance value of the integrated digital image data of each color component stored for each color component in the image memory 13 and uses pseudo monochrome image data indicating a grayscale image close to the light intensity on the projection surface. Is generated.
The contrast image generation unit 17 performs contrast enhancement processing of the pseudo monochrome image data generated by the pseudo monochrome image generation unit 16 and enhances the luminance distribution feature in a state in which the luminance distribution feature on the projection surface of the screen 2 is inherited. The contrast of the pseudo monochrome image data is increased and sharpened by increasing the luminance difference between the bright portion and the dark portion of the projected video.
[0026]
The corner search unit 18 uses a pattern matching method to detect the presence of a corner region from the 3 × 3 projection pixel region that constitutes the corner in the image region at the camera field of view corresponding to the four imaging positions on the screen 2. And the position information of the global projection image area.
The projection processing unit 19 performs luminance integration for each of the X and Y directions in the set focus inspection area, and calculates the light intensity distribution on the projection surface of the projection pixel area for each of the X and Y directions in a sinusoidal shape. Expressed as feature variation.
[0027]
The in-area light quantity analysis unit 20 searches for the maximum value and the minimum value of the luminance integrated values in the X and Y directions obtained by the projection processing unit 19.
The projected image adjustment operation planning unit 21 includes the observation reference position coordinates of the projection pixels in the four corners searched by the corner searching unit 18 and the in-area light quantity analyzing unit 20, and the X and Y directions by the projection processing unit 19 of this peripheral region. The current position of the projection area is grasped from the maximum value and the minimum value of each of the luminance integral values of each of the images, the amount of deviation from the observation reference position of the four corners of the projected image with respect to the predetermined adjustment reference position is obtained, the rotation direction, and X , Y direction movement amount, adjustment coarse adjustment and fine movement operation plan in angle correction.
[0028]
The optical axis movement calculation unit 22 performs an operation plan obtained from the projection image corner position relationship corresponding to each imaging area obtained by the projection image adjustment operation planning unit 21 in each direction with respect to the target position of each corner position. The movement amount of the optical axis is calculated, the posture of the entire projection image is grasped so that each corner enters the imaging area for each imaging area, and the adjustment optical axis correction amount is calculated every time the projection image is captured.
Based on the corner position information for each imaging area obtained by the optical axis movement calculation unit 22, the optical axis control unit 15 rotates the projected video corner position, the slide positions of the liquid crystal panels 9 a, 9 b, and 9 c in the liquid crystal projector 1 and the rotation. The correction value is uniquely calculated, and the calculated projected image corner position and the correction value are sent as command values to the optical axis adjustment mechanism unit 8.
[0029]
The optical axis adjustment mechanism unit 8 is a mechanism for adjusting the mounting position of the optical components of the liquid crystal projector 1 based on the command value from the optical axis control unit 15, and the liquid crystal panels 9a, 9b, 9c shown in FIG. The optical axis when adjusting the light from the panels 9a, 9b, 9c to the dichroic prism 10 for color synthesis is adjusted.
[0030]
In FIG. 6, X, Y, Z, θ, Xθ, and Yθ indicate the adjustment optical axes of the liquid crystal panel 9a (in charge of G color) that is moved by the optical axis adjustment mechanism 8, and the plane of the liquid crystal panel 9a The incident light direction (normal direction) perpendicular to is defined as the Z axis. The position of the liquid crystal panel 9a is determined by six axes including a panel position X, Y, Z, a rotation angle θ on the Z axis, a panel tilt angle Xθ in the X axis direction, and a panel tilt angle Vθ in the Y axis direction. However, in the color tone composition positioning adjustment, three adjustment optical axes of the X axis, the Y axis, and the θ axis around the Z axis are adjusted. The liquid crystal panel 9b responsible for the R color and the liquid crystal panel 9c responsible for the B color have the same optical axis coordinate arrangement.
[0031]
Next, the operation of the present embodiment will be described in detail with reference to FIGS. FIG. 7 is a flowchart for explaining an adjustment procedure example of automatic positioning adjustment for color tone composition in the present embodiment.
First, the G color is turned on (step A1), and 4 corners move into each imaging area from the center of a 3 × 3 projection pixel area (hereinafter referred to as an observation reference position) including the corner end points obtained from pattern matching. By obtaining the amount and adjusting the optical axis position, the corner portion is guided to an approximate adjustment reference position at an adjustment target position (hereinafter referred to as an adjustment reference position) preset in each imaging region (step A2). .
[0032]
Subsequently, an accurate observation reference position of the four corners is obtained from the luminance distribution in each imaging region, and a position correction amount to the adjustment reference position is calculated by fine adjustment corner guidance, Adjustment criteria The observation reference position of the corner portion is matched with the position (steps A3 and A3 ′). Next, the observation adjustment position coordinates of the final four corners of G color are stored and set as adjustment reference positions for R color and B color (step A4). In the same procedure as for G color, corner induction adjustment for R color is performed (steps A5, A6, A7, A7 ′), and corner guidance to the B color imaging region is performed (steps A8, A9, A10, A10 ′). Then, the positioning adjustment of the color tone composition is finished.
[0033]
Next, the automatic positioning adjustment in the present embodiment. Adjustment Will be described. FIG. 8 is a flowchart for explaining the operation in the automatic positioning adjustment. In the following description, the monochromatic raster scan image is an image for performing automatic positioning adjustment for color tone synthesis. For example, for the automatic positioning adjustment for color tone synthesis of the liquid crystal panel 9a in charge of G color, A single color raster scan video is used. In addition, R color single-color raster scan video is used for automatic positioning adjustment of color tone composition of the liquid crystal panel 9b in charge of R color. Similarly, a single color raster scan image of B color is used for the automatic positioning adjustment of the color composition of the liquid crystal panel 9c in charge of the B color. Hereinafter, an example in which automatic positioning adjustment for color tone synthesis of the liquid crystal panel 9a in charge of G color will be described.
[0034]
First, the video signal generator 4 provides a monochromatic raster scan video to the liquid crystal projector 1 (step B1), and the liquid crystal projector 1 uses the provided monochromatic raster scan video for the liquid crystal panels 9a, 9b, 9c corresponding to the corresponding color. Is passed through and projected as a single color projection image on the screen 2 (step B2). Next, the color CCD cameras 3a, 3b, 3c, and 3d respectively capture the four corners of the G color projection image projected on the white material panels 6a, 6b, 6c, and 6d as color images (step B3). A / D conversion is performed for each color component of each color image captured by the / D conversion circuit 11 (step B4).
[0035]
Thereafter, the digital image integrator 12 generates integrated digital image data obtained by integrating four A / D converted color images for each color component (step B5), and stores the integrated digital image data in the image memory 13 for each color component. . On the screen 2, a G color projection image that has passed through the liquid crystal panel 9 a in charge of G color is projected. B Since color components are also included, the color CCD cameras 3a, 3b, 3c, and 3d capture the image as a color image.
[0036]
Here, handling of a color image taken by a color CCD camera will be described. FIG. 9 is a plan view showing an example of integrated digital image data generated by the digital image integrator shown in FIG. As shown in FIG. 9, the integrated digital image data generated by the digital image integrator 12 is four color images obtained by A / D conversion after being imaged by the color CCD cameras 3a, 3b, 3c, 3d (FIG. 1). Each area corresponding to the color CCD cameras 3a, 3b, 3c, and 3d is composed of a bright portion of the projection pixels and a dark portion that becomes a break between the projection pixels.
[0037]
The luminance distribution at the pixel position (x, y) in one frame of the integrated digital image data is R (x, y), G (x, y), B (x, y) for each color component in the image memory 13. y) (hereinafter described as R, G, and B, respectively). The digital image data integrator 12 integrates the images of the four color CCD cameras 3a, 3b, 3c, and 3d as integrated digital image data that can be confirmed on a single screen, so that four images taken by the four color CCD cameras are captured. The video can be handled as an image signal of one frame. As a result, when the image recognition processing unit 14 performs image processing and color composition automatic positioning processing, four images can be simultaneously executed, so that each image of each color CCD camera 3a, 3b, 3c, 3d can be executed. In addition, it is not necessary to perform image processing, and the adjustment time can be shortened by reducing the number of imaging operations and the number of image processing operations.
[0038]
When the integrated digital image data is generated as described above, the pseudo monochrome image generation unit 16 generates pseudo monochrome image data (step B6). The pseudo monochrome image generation unit 16 reads the integrated digital image data stored in the image memory 13 from the image memory 13, and weights the luminance distributions R, G, and B of the respective color components of the integrated digital image data to make a monochrome image. Monochrome image data is generated. As the weighting of the luminance distributions R, G, and B when generating the pseudo monochrome image data, for example, the luminance distribution I of the pseudo monochrome image data on the pixel position (x, y) in one frame in the integrated digital image data. (X, y) may be calculated as “I (x, y) = (28 × R + 77 × G + 151 × B) / 256” to generate pseudo monochrome image data. Note that this formula is an application of the luminance signal and color signal conversion formula described in page 105 of “Practical Image Processing Learned in C Language (Ohm)”.
[0039]
Next, the contrast image generation unit 17 performs contrast enhancement processing on the pseudo monochrome image data generated by the pseudo monochrome image generation unit 16 (step B7). FIG. 10 is a histogram of the number of pixels for each luminance value for explaining the contrast enhancement processing by the contrast image generation unit shown in FIG. 5, and FIG. 11 shows the algorithm of the contrast enhancement processing by the contrast image generation unit shown in FIG. It is explanatory drawing for demonstrating. FIG. 12 is a graph for comparing the luminance distributions in the same region before and after the contrast enhancement processing by the contrast image generation unit 17 shown in FIG.
[0040]
As shown in FIG. 11A, the contrast image generation unit 17 obtains the total number of pixels of the pseudo monochrome image data generated by the pseudo monochrome image generation unit 16, takes a histogram for each luminance value, ), The number of pixels in each luminance value is averaged. In the pseudo monochrome image data, when the number of pixels is distributed in the state shown in FIG. 11A from luminance values 0 to 7, the total number of pixels is 2 + 6 + 2 + 5 + 4 + 3 + 2 + 0 = 24, and the luminance values are divided into 8 levels. Therefore, when the total number of pixels is divided by 8, 3 is obtained as the number of pixels assigned to one luminance value. Three pixels are extracted from the higher one (brightness value 7) of the pseudo-monochrome image data, and are newly assigned from the luminance value 7 so that the number of pixels of each luminance value becomes 3, as shown in FIG. . In this way, by assigning pixels from where the number of pixels is large to where the number is small, the number of pixels for each luminance value is made equal, and the contrast is enhanced.
[0041]
FIG. 12 is a comparison of the luminance distribution of the same region before and after the contrast enhancement processing of the luminance distribution between the projected pixels of the B-color projection image projected on the white material panel 6 a on the screen 2. It can be seen that the contrast enhancement process increases the brightness difference between the bright portion of the projection pixel and the dark portion, which is the partition of the projection pixel, and the contrast is enhanced. In FIG. 12, the vicinity of X-coordinates 23 to 27 corresponds to a dark part that becomes a break between projection pixels.
[0042]
When the contrast enhancement process is performed as described above, the corner search unit 18 sets a corner search area for each imaging area (step B8). FIG. 13A is a plan view showing an example of a template for searching for a vertical edge region in the imaging region of the color CCD camera 3a shown in FIG. 4 during corner search. FIG. 13B is a plan view showing an example of a template for searching for a lateral edge region in the region.
[0043]
FIGS. 13C, 13D, 13E, and 13F are templates for searching corner areas existing in the respective imaging areas of the color CCD cameras 3a, 3b, 3c, and 3d by pattern matching. It is a top view which shows an example. These templates are registered in advance in the form of image data before color tone composition positioning is performed. For example, these templates are secured in an image memory and are stored as image files (image data) in a hard disk. You may read.
[0044]
Among the templates described above, the corner search unit 18 first sets the imaging area as the edge area in the lower left imaging area, and the corner area as the templates shown in FIGS. 13 (a) to 13 (f). The position difference from the adjustment reference value is obtained by using binary pattern matching based on the correlation value between and the optical axis command value is generated to guide the corner portion to the adjustment reference position (steps B9, B10, B11, B12). These operations are managed by the projected video operation planning unit 21 of the image recognition unit 14, but the observation reference position of each corner obtained by pattern matching exists within the range of the adjustment reference position set in the captured image. If not, the projection processing unit 19 is not activated.
[0045]
When it is determined that the rough adjustment has been completed, the projection video operation planning unit 21 determines that the fine adjustment state has been reached, and activates the projection processing unit 19. The activated projection processing unit 19 performs luminance integration for each X and Y direction in each imaging region (step B13), and determines the observation reference position of each corner determined from the optical characteristics (step B14). Further, the in-area light quantity analysis unit 20 obtains the maximum absolute value of the difference between the luminance integrated values in the X and Y directions in each corner imaging region for each corner (step B15), and uses the optical characteristics of the projection pixel. From the difference between the determined observation reference position of each corner and the adjustment reference position in each imaging region, the amount of movement sent to the control unit of each optical axis is calculated (step B16). After these, our video operation planning unit 21 performs optical axis adjustment (step B17).
[0046]
The projected image operation planning unit 21 performs rough adjustment / fine adjustment determination, creates an operation plan for position correction according to the imaging state, Coarse Adjustment Coarse The adjustment unit 21a is caused to execute, and the fine adjustment is performed to the fine adjustment unit 21b. FIG. 14 describes the operation plan of the projection image operation plan unit 21 for coarse adjustment. Coarse The operation of the adjusting unit 21a is shown. Coarse The adjustment unit 21a first guides the left corner portion into the imaging area of the color CCD camera 3c, first causes the color CCD camera 3c to image the lower left corner portion (step C1), and performs pattern matching using the template of FIG. To search for a corner position (step C2).
[0047]
Coarse If there is a corner, the adjustment unit 21a converts the coordinate difference between the observation reference position and the adjustment reference position in the lower left corner in the X and Y directions into an optical axis control amount and creates a movement command (Step C3). C5). If the lower left corner does not exist in pattern matching, 3C corner guidance processing (step C4) is performed.
[0048]
FIG. 15 shows an operation flow of corner guidance processing to the imaging region of the color CCD camera 3c when the lower left corner does not exist. For example, it is assumed that the video part is projected in the state shown in FIG. In guiding into the imaging area of the color CCD camera 3c in the lower left corner, first, the vertical edge area and the horizontal edge area are detected using the pattern matching method using the templates shown in FIGS. 14 (a) and 14 (b). (Steps D1, D3). Here, when it is determined that there is an edge region, the correlation error between patterns is experimentally determined to be 20% or less.
[0049]
If a pattern is found, a coordinate difference between an observation reference position in the pattern area and a reference pixel position predetermined in the imaging area is obtained, the optical axis is moved in the target direction (steps D2 and D4), and the image is captured. The edge region is guided toward the reference position (FIGS. 16B and 16C). If no edge exists (FIGS. 16D and 16E), the luminance average in the imaging region is calculated (step D5).
[0050]
For example, when the corner portion is recognized as a solid part, for example, when the brightness value of the imaging region indicating brightness is 128 or more (FIG. 16E), the optical axes in the X and Y directions are moved in the upper right direction in the upper right direction. Let The amount of movement described here is 1/3 of the length in the X and Y directions of the imaging region that is the corner search target, and is determined by equations (S1) and (S2) for calculating the amount of movement in the direction described later. Similarly, when there is no corner pattern or edge pattern (FIG. 16D), the average brightness is 128 or less. The X and Y directions are moved by 1/3 of the corner target imaging area width so that it is intentionally left lower. By performing such processing, the lower left corner surely enters the imaging area of the color CCD camera 3c. (FIG. 16 (f))
[0051]
On the other hand, even if the lower left corner is guided, the upper left corner may not enter the imaging area of the color CCD camera 3c (FIG. 16 (g)). This is a case where rotation is applied to the θ direction of the Z axis in the normal direction of the liquid crystal panel. At this time, the upper left corner portion is preferentially guided to the imaging area of the color CCD camera 3c, thereby guiding the two left corners of the projected image to the imaging area.
[0052]
Hereinafter, the guidance method for the upper left corner will be described in detail with reference to the operation flow of FIG. First, the lower left corner area is first imaged (step E1), and the observation reference position of the lower left corner is recorded using pattern matching. ( Step E2) Subsequently, the upper left corner area is imaged (step E3), and the observation reference position of the upper left corner is acquired by pattern matching. When the corner enters the imaging area of the color CCD camera 3a, the observation reference position at the center of the 3 × 3 projection pixel in the upper left corner is obtained. When the lower left corner enters the imaging area of the color CCD camera 3c, the rotation angle is obtained from the angle error between the previously stored observation reference position and the observation reference position of the upper left corner (step E5) so that the left edge becomes vertical. The optical axis is moved to (step E6).
[0053]
After moving, the lower left corner and the upper left corner are imaged, and pattern matching is performed again to obtain position information when the two corners on the left side are within the imaging range (step E7 , E8, E9). Even in this case, the lower left corner may be displaced due to the correction of the rotation angle (FIG. 16 (h)). In such a case, as shown in the flow of FIG. 17, in order to put both the upper left corner and the lower left corner into the imaging areas of the color CCD cameras 3a and 3c, the lower left corner is once designated in advance. From the center of the area Upper left Set the save position coordinates (x0, y0) to
X-axis direction position = x0 + (Imod3) × M (S1)
Y-axis direction position = y0 + (I / 3) × (N / 3) (S2)
As a result, the two left corners are moved until they enter the imaging areas of the color CCD camera 3a and the color CCD camera 3c (steps E10 and E11). However, M and N in Formula (S1) and Formula (S2) are distances in the imaging area in the X and Y directions.
[0054]
Whether the two corners have entered the imaging region can be determined by performing a pattern matching process using the upper left corner and the lower left corner as templates, respectively, so that the correlation error is 20% or less. By repeating the imaging and pattern matching according to the movement amounts in the X and Y directions defined by the equations (S1) and (S2), the two left corners can be guided to the imaging region.
[0055]
FIG. 18 is a plan view showing an example of the movement of the projected image when the optical axes in the X and Y directions are moved according to the equations (S1) and (S2). As shown in FIG. 18, two left corner end points of the projected image enter the imaging area sequentially as if to draw an arc, so that the corner area enters the imaging area at the same time. I can see it going. Similarly, if the two corners of the lower left corner and the lower right corner are guided to the imaging areas of the color CCD camera 3c and the color CCD camera 3d as in the operation of FIG. 17, the flowchart of FIG. By doing so, the lower edge position of the projected image can be adjusted to the vicinity of the predetermined adjustment reference position (steps F1 to F11 in FIG. 19).
The operation plan of the above processing Coarse By executing the adjustment unit 21a, the four corners can be surely placed in the imaging region, and the coarse adjustment is finished. As described above, the projected image can be moved to an appropriate position.
[0056]
Next, at the stage where the four corners are within the imaging range by the coarse adjustment, the fine adjustment unit 21b executes the operation plan of the fine corners by the projection video operation plan unit 21 of the image recognition unit 14. The processing flow of fine adjustment corner guidance by the fine adjustment unit 21b will be described with reference to FIG.
First, the corner position with respect to the imaging area corresponding to the imaging of each corner imaging area is obtained by pattern matching, and the observation reference position of each corner is obtained (steps G1 to G8). Subsequently, an inverted image is generated by inverting the luminance value of the pseudo monochrome image data (step G9). Next, luminance integrals in the X and Y directions at each imaging position are obtained using the projection processing unit 19 (step G10). At this time, the peak position is searched using the in-area light quantity analysis unit 20 to obtain the optical projection pixel center among the 3 × 3 projection pixels constituting the corner region.
[0057]
FIG. 21 is an explanatory diagram illustrating an example in which a peak position is detected from a reversed image obtained by inverting pseudo-monochrome image data and pixels are obtained. By detecting the second peak position of the integrated luminance value in the X and Y directions of the projected image, the observation reference pixel position based on the optical characteristics in each corner area can be extracted. Furthermore, in step G10, the maximum absolute value of the difference between the luminance integral values in the X and Y directions in each imaging region,
Rot (x) = MAX {Cx (θ)} (S3)
Rot (x) = MAX {Cy (θ)} (S4)
Is obtained using the in-area optical analysis unit 21.
However,
Cx (θ) = ABS (PXmax−PXmin) (S5)
Cy (θ) = ABS (PYmax−PYmin) (S6)
It is.
[0058]
As shown in FIG. 22, by obtaining the angular position that is the maximum of the absolute value of the difference between the luminance integral values in the X and Y directions, the amount of rotational deviation can be known (step G11).
FIG. 23 is a plot of the maximum absolute value of the peak difference of the luminance integral value when the projected image is shifted clockwise by 5 degrees in the luminance integral shown in FIG. The angle when the maximum value of the peak difference of the luminance integrated value is maximum is clearly perpendicular to the projection direction. Accordingly, it can be seen that the rotational shift can be corrected by adjusting the angle to the position where the maximum value of the peak difference of the luminance integral value at each angle is obtained.
[0059]
When the above rotation correction is performed, the observation reference positions of the four corners in the X, Y, and directions are shifted. Therefore, by determining the amount of movement in these X and Y directions (FIG. 24C), each of the four corners is designated. The observation reference position of each corner can be adjusted to the adjusted reference position.
[0060]
As described above, in the present embodiment, the pseudo monochrome image generation unit 16 uses the luminance value of the integrated digital image data of each color component stored in the image memory 13 for each color component, and uses the luminance value on the projection surface. Since pseudo monochrome image data that is a grayscale image close to light intensity is generated, an image captured in a single color can be handled as luminance information irrelevant to the color of the projected video. As a result, according to the present embodiment, it is possible to appropriately set the luminance setting of the image captured by the color CCD camera regardless of the difference in visibility between the color CCD camera sensitivity and the naked eye, and to adjust the automatic color tone positioning. By performing the above, there is an effect that the optical axis position can be accurately adjusted to the position where the color shift of the projected image is the smallest.
[0061]
Furthermore, in the present embodiment, the contrast image generation unit 17 obtains the luminance distribution state of the pseudo monochrome image data, creates a histogram for each luminance value, performs luminance conversion so that the number of pixels of each luminance value becomes equal, The brightness distribution feature is emphasized while inheriting the light intensity distribution feature on the projection surface, and the brightness difference of the pixel between the bright part and the dark part of the projected image is increased. As a result, according to the present embodiment, since the image can be sharpened by increasing the contrast, the original property of the luminance dispersion of the projection pixel is clarified, and even in the case of blue having extremely poor visibility, By automatically adjusting the color tone positioning, there is an effect that the position of the optical axis can be accurately adjusted to the position where the color shift of the projected image is the best.
[0062]
Furthermore, in the present embodiment, the projection processing unit 19 performs luminance integration for each direction in the X direction and the Y direction, which are the distribution characteristics of light in the focus inspection area, and the projection pixel area for each direction on the projection surface. The luminance distribution is expressed as a characteristic variation of a sine wave shape with emphasis. As a result, according to the present embodiment, it is possible to automatically adjust the positioning of the color tone in consideration of the blurring method in the vertical (Y) direction and the horizontal (X) direction of the projection pixel of the projection video, and the optical axis is accompanied. It is difficult to be affected by pixel shape fluctuations of individual projection pixels, flare between projection pixels, and image noise, and can take universal features regardless of the position of the projection image. The color of the projection pixel area of the projection image There is an effect that the position of the optical axis can be accurately adjusted to the position where the deviation is the smallest.
[0063]
Further, in the present embodiment, the projection peak value in each of the X and Y directions is obtained from the maximum value and the minimum value of the luminance integrated value that emphasizes the luminance distribution on the screen 2, and the difference between the maximum value and the minimum value of the peak value is obtained. The optical axis position where the absolute value of the maximum value is obtained as the color tone positioning position without rotational deviation. As a result, according to the present embodiment, there is an effect that the optical axis position can be accurately adjusted to the position where the color shift due to the rotational shift is minimized.
[0064]
Further, in the present embodiment, the projected images projected on the white material panels 6a, 6b, 6c, 6d such as photo printing paper or standard white board with a small surface roughness stretched on the screen 2 are captured. did. As a result, according to the present embodiment, it is possible to capture a projected image reflecting the original optical characteristics of the liquid crystal projector 1 without being affected by irregular reflection of light due to unevenness of the screen or reflected light of external light, There is an effect that the optical axis position can be accurately adjusted to the focus position where the focus of the entire projected video is the clearest.
[0065]
In the present embodiment, the projected images are picked up by the color CCD cameras 3a, 3b, 3c, and 3d arranged at the four corners of the projected image, and the focus position for each image pickup location is obtained. As long as the deviation between the tilt angle Xθ and the tilt angle Vθ in the Y-axis direction does not cause a problem, the number of imaging locations may be reduced to one location in the center of the projected image.
[0066]
Further, the present invention is not limited to the above-described embodiments, and it is obvious that each embodiment can be appropriately changed within the scope of the technical idea of the present invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a suitable number, position, shape, and the like in carrying out the present invention. In each figure, the same numerals are given to the same component.
[0067]
【The invention's effect】
As described above, according to the present invention, it is possible to appropriately set the brightness setting of the image captured by the camera regardless of the difference in the visibility between the camera sensitivity and the naked eye, and to perform the automatic positioning adjustment of the color tone. Thus, it is possible to obtain an excellent effect that the optical axis position can be accurately adjusted to a position where the color deviation of the projection optical system is the smallest.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a configuration example of a color tone composition automatic positioning apparatus according to an embodiment of the present invention.
2 is a plan view showing the positional relationship between the color CCD cameras (imaging means) 3a, 3b, 3c, 3d shown in FIG.
3 is a side view showing an example of a positional relationship between the color CCD cameras 3a, 3b, 3c, and 3d shown in FIG.
4 is an explanatory diagram showing an example of an imaging position on a screen by the color CCD cameras 3a, 3b, 3c, and 3d shown in FIG.
FIG. 5 is a block diagram illustrating a configuration example of an image recognition processing unit 14 illustrated in FIG. 1;
6 is a perspective view showing an example of a positional relationship between an adjustment optical axis of an optical component of a liquid crystal projector moved by an optical axis adjustment mechanism unit 8 shown in FIG. 1 and a liquid crystal panel for each color. FIG.
FIG. 7 is a flowchart for explaining an adjustment procedure example of automatic positioning adjustment for color tone composition in the present embodiment;
FIG. 8 is a flowchart for explaining an operation in automatic positioning adjustment;
FIG. 9 is a plan view showing an example of integrated digital image data generated by the digital image integrator shown in FIG. 5;
10 is a histogram of the number of pixels for each luminance value for explaining the contrast enhancement processing by the contrast image generation unit shown in FIG.
11 is an explanatory diagram for explaining an algorithm of contrast enhancement processing by a contrast image generation unit shown in FIG.
12 is a characteristic diagram for comparing luminance distributions in the same region before and after contrast enhancement processing by the contrast image generation unit 17 shown in FIG. 5. FIG.
13 is a plan view showing an example of a template for searching for an edge region in an imaging region of the color CCD cameras 3a, 3b, 3c, and 3d shown in FIG.
FIG. 14 Coarse It is a flowchart which shows operation | movement of the adjustment part 21a.
FIG. 15 shows an operation flow of corner guidance processing to the imaging region of the color CCD camera 3c when the lower left corner does not exist.
FIG. 16 is a plan view showing a relationship between an imaging area and a projected video area.
FIG. 17 is a flowchart showing the guiding operation of the upper left corner.
FIG. 18 is a plan view showing an example of the movement of the projected image when the optical axes in the X and Y directions are moved according to the equations (S1) and (S2).
FIG. 19 is a flowchart showing an operation of aligning the lower edge position of a projected image to the vicinity of a predetermined adjustment reference position.
FIG. 20 is a flowchart showing the processing operation of fine adjustment corner guidance by the fine adjustment unit 21b.
FIG. 21 is an explanatory diagram illustrating an example in which a peak position is detected from a reversed image obtained by inverting pseudo monochrome image data and pixels are obtained.
FIG. 22 is an explanatory diagram showing an example in which a pixel is obtained by detecting a peak position from an inverted image obtained by inverting pseudo monochrome image data.
23 is a characteristic diagram showing the transition of the maximum value of the absolute value of the peak difference of the luminance integral value when the projected image is shifted clockwise by 5 degrees in the luminance integral shown in FIG.
FIG. 24 is a plan view showing a relationship between an imaging area and a projected video area.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Liquid crystal projector, 2 ... Screen, 3a, 3b, 3c, 3d ... Color CCD camera, 4 ... Image signal generator, 8 ... Optical axis adjustment mechanism part, 9a, 9b, 9c, 9d ... Liquid crystal panel, 10 ... Dichroic Prism, 11 ... A / D conversion circuit, 12 ... digital image integrator, 13 ... image memory, 14 ... image recognition processing unit, 15 ... optical axis control unit, 16 ... pseudo monochrome image generation unit, 17 ... contrast image generation unit , 18 ... Corner search unit, 19 ... Projection processing unit, 20 ... In-area light quantity analysis unit, 21 ... Projection image operation planning unit, 22 ... Optical axis movement calculation unit.

Claims (10)

In order to synthesize a plurality of images formed by passing through a plurality of liquid crystal panels into one projected image, an automatic color tone positioning and adjustment device that adjusts the optical axis positions of the plurality of liquid crystal panels,
Imaging means for imaging the projected image as an image by moving an optical axis position in the X, Y, and θ directions of the liquid crystal panel;
A pseudo monochrome image generation unit that generates pseudo monochrome image data indicating a light intensity distribution on a projection plane of the projection video from the image captured by the imaging unit;
A corner search unit for extracting the position of the corner portion in the pseudo monochrome image data generated by the pseudo monochrome image generation unit;
From the corner position information obtained by the corner search unit, a coarse adjustment unit for guiding all four corners of the projection image to a predetermined position range of the imaging range;
The central pixel position of the 3 × 3 projection pixel area including the apexes in the four corners that have entered the predetermined area is obtained based on the peak position of the luminance integration, and an optical observation standard within the captured projection image range A fine adjustment unit that guides the corner position within a predetermined adjustment reference position of the projector optical unit;
An optical axis adjustment mechanism that moves the liquid crystal panel to the optical axis position determined by the coarse adjustment unit and the fine adjustment unit;
A projection processing unit that performs luminance integration in a predetermined region of the projection image;
The maximum value PXmax of the luminance integral value in the X direction, the minimum value PXmin of the luminance integral value in the X direction, and the maximum value of the luminance integral value in the Y direction of the pseudo monochrome image data integrated by the projection processing unit in the X and Y directions. An in-area light quantity analysis unit that calculates the value PYmax and the minimum value PYmin of the luminance integrated value in the Y direction for each optical axis position in the movement direction of the moved liquid crystal panel;
The fine adjustment unit obtains a position that is an angle at which an absolute value of a difference between a maximum value and a minimum value of the luminance integral values in the X and Y directions is maximum,
The automatic color tone composition positioning apparatus, wherein the optical axis adjustment mechanism unit moves the liquid crystal panel to a position where the absolute value is the maximum . In the automatic positioning apparatus for color composition according to claim 1,
The pseudo monochrome image generation unit has a luminance distribution I of the pseudo monochrome image data, and luminance distributions of the color components of the image are R, G, and B, respectively.
I = (28 × R + 77 × G + 151 × B) / 256
An automatic positioning device for color composition, characterized in that the pseudo-monochromatic image data is generated. In the automatic positioning apparatus for color composition according to claim 1,
A contrast image generation unit for enhancing the contrast of the pseudo monochrome image data;
The coarse adjustment unit determines a corner observation reference position that becomes a global corner position in the pseudo monochrome image data in which the contrast is enhanced by the contrast image generation unit,
An automatic tone synthesizing apparatus for searching for an optical axis position where the global corner position in a projected image is closest to a predetermined adjustment reference position. In the automatic positioning apparatus for color composition according to claim 1,
The contrast image generation unit averages the number of pixels in each luminance value of the pseudo monochrome image data. An automatic positioning apparatus for color composition. The automatic positioning device for color tone composition according to any one of claims 1 to 4,
The fine adjustment unit determines a true observation reference position based on optical characteristics existing in the vicinity of corner position information in the pseudo-monochrome image data in which the projection processing unit integrates luminance in the X, Y, and θ directions. An automatic positioning device for color composition. The automatic positioning device for color tone composition according to claim 5 ,
The fine adjustment unit
From the calculated PXmax, PXmin, PYmax and PYmin, the maximum value at each optical axis position in the X and Y directions is calculated,
An automatic tone synthesizing device that searches for an observation reference pixel position necessary for alignment in a projected image. In the automatic positioning device for color composition according to any one of claims 1 to 6 ,
The imaging means is for imaging four corners of the video,
The rough adjustment unit searches the optical reference position for each of the adjustment reference pixel positions using the observation reference pixel positions optically uniquely determined at the four corners imaged by the imaging unit. Automatic positioning device. 8. The automatic color synthesizing apparatus according to claim 7, wherein the liquid crystal panel is moved in the X-axis direction ΔX, the Y-axis direction is moved ΔY based on the optical axis positions of the four corners searched by the coarse adjustment unit. An automatic tone synthesizing apparatus comprising an optical axis controller for calculating a correction value for correcting a rotational movement amount Δθ in a normal direction of a liquid crystal panel. The automatic positioning device for color composition according to any one of claims 1 to 8 , wherein the imaging means captures the image projected on a screen on which a white material panel having a small surface roughness is stretched. Automatic color synthesizing automatic positioning device. In order to synthesize a plurality of images formed by passing through a plurality of liquid crystal panels into one projection image, a color tone automatic positioning adjustment method for adjusting the optical axis positions of the plurality of liquid crystal panels,
Taking the video as an image while moving the optical axis position in the X, Y, θ direction of the liquid crystal panel,
Generate pseudo monochrome image data from this captured image,
Search the optical axis position based on the position information of the four corners in the pseudo monochrome image data and the luminance distribution in each corner imaging region,
A maximum value PXmax in the X-direction luminance integral value, a minimum value PXmin in the X-direction luminance integration value, a maximum value PYmax in the Y-direction luminance integration value, and a minimum value PYmin in the Y-direction luminance integration value of the pseudo monochrome image data. Calculate
A position that is an angle at which an absolute value of a difference between the maximum value and the minimum value of the luminance integrated values in the X and Y directions is maximum;
An automatic positioning method for color synthesis , wherein the liquid crystal panel is moved to a position where the absolute value is the maximum .

Images