JP3716786B2 - Video display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for displaying an image using a screen and a projector.
[0002]
[Prior art]
Conventionally, one screen and two image modulation projection means are provided, and the image modulation projection means is installed so that an overlapping projection area exists on the screen, and further, the original image is modulated by the image modulation projection means. In an image display device, for example, an image projecting system described in Japanese Patent Application Laid-Open No. 9-326981, displays an edge blend process for each image. This is performed by a function related to the distance from the outer periphery of the projection area of the modulation projection means.
[0003]
[Problems to be solved by the invention]
When the edge blending process is performed as a function related to the distance from the outer periphery of the projection area of each image modulation projection unit as in the conventional apparatus, the projection area of one of the image modulation projection units is the other on the screen. When each image modulation projection unit is installed so as to include one of the vertices of the projection area of the image modulation projection unit, a false contour in the vicinity of the vertex is generated due to the effect of optical synthesis error. In addition, the bright spots and dark spots at the apexes are easily perceived by the user, resulting in degradation of video quality.
[0004]
[Means for Solving the Problems]
In the present invention, in order to solve the above-described problems, the modulation performed by each of the image modulation projection means is such that the shape of the isoluminance line of the blend portion becomes a rounded curve near the vertex of the overlap projection region boundary. I did it. By doing so, it is possible to make it difficult for the user to perceive false contours, bright spots, and dark spots caused by the effect of errors in optical synthesis.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The first embodiment of the present invention will be described below with reference to FIGS.
FIG. 2 is a conceptual diagram of the apparatus in the first embodiment of the present invention.
The image modulation projection unit 20 modulates the original image data 205 input from the image output unit 22 and then projects the modulated image 206 after the modulation onto the video area 204 on the screen 23. Further, the image modulation projection unit 21 modulates the original image data 215 input from the image output unit 22 and then projects the modulated image 216 after the modulation onto the video area 214 on the screen 23. The image modulation projection means 20 and the image modulation projection means 21 are installed so that the video area 214 is inside the video area 204 on the screen 23. At this time, generally, on the screen 23, the video projected inside the video area 214 is higher in definition than the video projected inside the video area 204.
[0006]
In order to provide the user with the video displayed in the video area 204 and the video area 214 on the screen 23 as one video that is connected as a whole, the image modulation projection means 20 can change the original image data 205 1 and FIGS. 4 to 11 will be used to describe specific examples of whether to perform modulation and what kind of modulation should be applied to the original image data 215 in the image modulation projection means 21. explain.
[0007]
FIG. 3 is an apparatus configuration diagram in the first embodiment of the present invention. 3, the same symbols as those in FIG. 2 represent the same symbols as those in FIG.
[0008]
The image output means 22 uses the arithmetic processing unit 224 and based on the image generation program 222 and the image generation data 223 in the main storage device 221, the original image data 205 to be given as input to the image modulation projection means 20. Is output from the image output board 225 toward the image modulation projection means 20. Similarly, the image output means 22 uses the arithmetic processing unit 224 and based on the image generation program 222 and the image generation data 223 in the main storage device 221, the image output means 22 should be given as input to the image modulation projection means 21. Image data 215 is generated and output from the image output board 226 toward the image modulation projection means 21. Note that when generating the original image data 205, the hardware acceleration function of the image output board 225 may be used. Similarly, when generating the original image data 215, the hardware of the image output board 226 is used. Needless to say, the acceleration function may be used. Note that an external storage device 227 may be provided, and the image generation program 222 and the image generation data 223 may be read from the external storage device 227 as necessary. Further, the communication unit 228 may be provided, and the image generation program 222 and the image generation data 223 may be read from the network via the communication unit 228 as necessary.
[0009]
The image modulation projection unit 20 performs modulation on the original image data 205 input from the image output board 225 using the image modulation unit 201 based on a given image modulation parameter 202 and performs the modulation. The modulated image 206 is projected from the image projection unit 203 toward the screen 23.
[0010]
The image modulation projection unit 21 performs modulation on the original image data 215 input from the image output board 226 using the image modulation unit 211 based on a given image modulation parameter 212 and performs the modulation. The modulated image 216 is projected from the image projection unit 213 onto the screen 23.
[0011]
Note that specific parameters to be used as the image modulation parameter 202 and the image modulation parameter 212 will be described with reference to FIGS. 1 and 4 to 11.
[0012]
Hereinafter, a specific method for generating the image modulation parameter 202 and the image modulation parameter 212 will be described with reference to FIGS. 1 and 4 to 11.
FIG. 4 is a flowchart of image modulation parameter generation processing in the first embodiment of the present invention.
[0013]
In FIG. 4, when the image modulation parameter generation process is started, first, in step 60, the coordinate correspondence data generation process is executed. This is a process for obtaining a correspondence between the coordinate system on the original image data 205 and the coordinate system on the original image data 215 on the screen 23 and generating a parameter for performing geometric modulation among the image modulation parameters. It is. In this embodiment, FIG. 5 is used to show an example in which the original image data 205 is not subjected to geometric modulation, but only the original image data 215 is subjected to geometric modulation and two images are superimposed.
[0014]
FIG. 5 is a diagram showing the relationship between the projected coordinate spaces in the first embodiment of the present invention. The projected coordinate space 40 is a projected coordinate space for the original image data 205, and the projected coordinate space 41 is a projected coordinate space for the original image data 215. The projection coordinate space 40 and the projection coordinate space 41 are generally twisted as shown in FIG. 5 due to the influence of the arrangement of the image modulation projection unit 20 and the image modulation projection unit 21.
[0015]
However, when the image generation program 222 and the image generation program 223 actually generate the original image data 205 and the original image data 215, the relationship between the projection coordinate spaces is such as the projection coordinate space 40 and the ideal projection coordinate space 42. Process under the condition that the relationship is Here, the relationship between the projection coordinate space 40 and the ideal projection coordinate space 42 is given in advance based on, for example, a standard of which part is displayed with high definition. Therefore, what corrects the difference between the projected coordinate space 41 and the ideal projected coordinate space 42 is a parameter for performing geometric modulation.
[0016]
This parameter can be generated as follows, for example, since the projection coordinate space of the modulated image 216 is the projected coordinate space 41 as is the projected coordinate space of the modulated image 215.
[0017]
First, the pixel at the pixel position 420 of the modulated image 216 is associated with the pixel at the pixel position 410 of the original image 206, the pixel at the pixel position 421 of the modulated image 216 is associated with the pixel at the pixel position 411 of the original image 206, The pixel at the pixel position 422 of the original image 206 is associated with the pixel at the pixel position 422 of the modulated image 216, and the pixel at the pixel position 413 of the original image 206 is associated with the pixel at the pixel position 423 of the modulated image 216. For a pixel whose correspondence is not determined at this stage, the correspondence may be determined by bilinear interpolation or the like.
[0018]
In general, the lattice points in the projected coordinate space 41 are not the lattice points in the ideal projected coordinate space 42. In such a case, the lattice points may be associated with the nearest pixel. Alternatively, the coordinate values of the pixels may be obtained as a set of real values and may be implemented by a mixed average process of pixel values of four neighboring pixels.
[0019]
The relationship between the projected coordinate space 40 and the projected coordinate space 41 is obtained by projecting an image for adjusting vertical stripes and horizontal stripes projected by the image modulation projection means 20 and the image modulation projection means 21 in the same manner as in the conventional apparatus. What is necessary is just to obtain | require based on the data image | photographed with the camera. When the screen 23 is a plane, a mesh image whose coordinate value is known is projected from the image modulation projection unit 20 and the coordinates of the four vertices of the projection area 214 of the image modulation projection unit 21 are read visually. In addition, the internal correspondence can be obtained by an interpolation method such as bilinear interpolation.
[0020]
In the projected coordinate space 41, the area that is not a common part with the ideal projected coordinate space 42 is an area where a meaningful image is not originally projected. Therefore, in the parameter for performing color modulation, the pixel of the corresponding part Make sure the value is always "black".
[0021]
If the relationship between the projection coordinate space 40 and the ideal projection coordinate space 42 is determined before the installation of the apparatus, the image modulation projection means 21 is installed so that the projection coordinate space 41 includes the ideal projection coordinate space 42. This is based on the relationship between the projection coordinate space 40 and the ideal projection coordinate space 42 and generates an adjustment image indicating the area occupied by the ideal projection coordinate space 42 by a frame line, and the adjustment image is converted into image modulation projection means. The image modulation projection means 21 may be installed so that the projection area 214 of the image modulation projection means 21 covers the frame line. Further, when the relationship between the projection coordinate space 40 and the ideal projection coordinate space 42 is determined after the installation of the apparatus, after the relationship between the projection coordinate space 40 and the projection coordinate space 41 is obtained, the projection coordinate space 41 is converted into the ideal projection coordinate space 41. The relationship between the projected coordinate space 40 and the ideal projected coordinate space 42 is determined so as to include 42.
[0022]
When the coordinate-corresponding data generation process at step 60 in FIG. 4 is completed, the luminance characteristic function generation process at step 61 is executed, and then the target luminance characteristic function calculation process at step 62 is executed. An outline of the luminance characteristic function generation process and the target luminance characteristic function calculation process will be described with reference to FIG.
[0023]
FIG. 6 is a diagram for explaining the luminance characteristic function and the target luminance characteristic function in the first embodiment of the present invention. In FIG. 6, a characteristic curve 310 is a characteristic curve showing a relationship between a pixel value input to the image projection unit 203 and a luminance value on the screen in an area projected by the image projection unit 203 alone. That is, when the pixel value 300 corresponding to “black” is input from the image modulation unit 201, the luminance on the screen is 311, and the pixel value 301 corresponding to “white” is input from the image modulation unit 201. In this case, the luminance on the screen is 313.
[0024]
Similarly, the characteristic curve 320 is obtained when the image projecting unit 203 and the image projecting unit 213 project “black” from the image projecting unit 203 in an area where the image projecting unit 203 and the image projecting unit 213 project. 6 is a characteristic curve showing the relationship between the pixel value input to the screen and the luminance value on the screen. When the pixel value 300 corresponding to “black” is input from the image modulation unit 211, the luminance on the screen is 321, and the pixel value 301 corresponding to “white” is input from the image modulation unit 211. Indicates that the luminance on the screen is 323.
[0025]
The luminance characteristic function generation process in step 61 is a process for obtaining this characteristic curve for each pixel and each image projection means. For example, in the case where “black” is projected from the image projecting unit 213 in an area where the image projecting unit 203 and the image projecting unit 213 project in addition to the above characteristic curve, the image projecting unit 203 A characteristic curve indicating the relationship between the pixel value input to the screen and the luminance value on the screen is also obtained in this step. At this time, the image projecting means other than the image projecting means for measuring the characteristic curve are not extinguished but are measured by projecting “black”. The luminance characteristic function generation processing can be performed by a method by measurement using a measuring instrument such as a luminance meter, as in the case of the device according to the prior art. You may implement by the method of image | photographing the correction pattern using a digital camera, and calculating | requiring by calculation.
[0026]
The target luminance characteristic function calculation process in step 62 is a process for obtaining a target luminance characteristic function, for example, the characteristic curve 330 in FIG. 6, from the characteristic curve obtained in the luminance characteristic function generation process in step 62. The target luminance characteristic function is a function that represents an output characteristic with respect to a pixel value input to the image modulation projection unit after adjusting the apparatus so that the video is smoothly connected. Therefore, as the characteristic curve 330, the luminance value corresponding to an arbitrary pixel value is higher than any of the luminance values corresponding to the pixel value 300 of the characteristic curve obtained in the luminance characteristic function generation processing in step 62. In addition, the curve needs to be a value that is lower than any of the luminance values corresponding to the pixel value 301 of the characteristic curve obtained in the luminance characteristic function generation processing in step 62.
[0027]
In order to maintain the contrast of the image, the maximum luminance value is set as high as possible taking into account the margin of error, and the minimum luminance value is set as low as possible in consideration of the margin of error. For example, a γ curve based on a given γ value.
[0028]
When the luminance characteristic function generation processing in step 61 and the target luminance characteristic function calculation processing in step 62 in FIG. 4 are finished, next, the correction parameter generation processing for each definition in step 63 is executed. When a certain definition is performed using a plurality of image projecting means, an edge blending process between images projected by the image projecting means is performed in the definition parameter generation process for each definition. In the case of the present embodiment, since one definition is used for each definition, it is not necessary to perform anything in the correction parameter generation processing for each definition.
[0029]
When the fineness-specific correction parameter generation processing in step 63 in FIG. 4 ends, the blend parameter generation processing in step 64 is then executed. An outline of the blend parameter generation processing in step 64 will be described using FIGS. 7 to 9 and then details will be described using FIGS. 1, 10, and 11.
[0030]
FIG. 7 is a view for explaining a blend region in the first embodiment of the present invention. The projected coordinate space 40 and the ideal projected coordinate space 42 are the same as those in FIG. Here, an area 43 is set inside the ideal projection coordinate space 42. A portion included in the region 43 in the ideal projection coordinate space 42 is a region where “black” is projected from the image modulation projection unit 20. In other words, this is an area where a meaningful video is displayed only from the image modulation projection means 21.
[0031]
A portion of the ideal projection coordinate space 42 that is not included in the region 43 is a region used as a “margin” portion between the image projected from the image modulation projection unit 20 and the image projected from the image modulation projection unit 21. . Image modulation projection means in the vicinity of the boundary line 70, the boundary line 71, and the vertex 80 after the image projected from the image modulation projection means 20 and the image projected from the image modulation projection means 21 are adjusted so as to be smoothly connected. The state of the isoluminance lines of the image projected from 21 is shown in FIGS. In the boundary line 70 and the boundary line 71, the boundary line 71 (that is, the region 43) is set so that the upper sides are parallel, the lower sides are parallel, the left sides are parallel, and the right sides are parallel. Shall be set.
[0032]
FIG. 8 is a diagram illustrating isoluminance lines in the blend region of the prior art. In the apparatus according to the prior art, the edge blending process is performed by a function related to the distance from the outer periphery of the projection area of each image modulation projection unit. In the case of this embodiment, as shown in FIG. It is an isoluminance line corresponding to the distance from 70 (however, it is an example considering the aspect ratio of the left and right and the top and bottom). In this case, a false contour resulting from a measurement error, a modeling error, or the like is perceived by the user in the area 72, or a bright spot or darkness caused by a measurement error, a modeling error, or the like at the vertex of the boundary line 70. The point was perceived by the user, leading to degradation of video quality.
[0033]
FIG. 9 is a diagram showing isoluminance lines in the blend region of the first embodiment of the present invention. In the present invention, the edge blending process is performed according to the distance from the boundary line 71 of the single fine display area. Therefore, with respect to the portion excluding the vertex 80 of the boundary line 71, the isoluminance line is a smooth curve as shown in FIG. It is possible to make it difficult for a user to perceive a dot, a dark spot, or the like. In the area 81 near the vertex of the boundary line 70, the image modulation projection means 21 displays “black”.
[0034]
Hereinafter, a blend parameter generation method in which the isoluminance line has such a shape will be described with reference to FIGS. 1, 10, and 11.
[0035]
FIG. 1 is a flowchart of blend parameter generation processing in the first embodiment of the present invention. In FIG. 1, the flow in the case of generating the image modulation parameter 212 will be described in detail.
[0036]
When the blend parameter generation process is started, first, one of the unprocessed pixels is selected in the pixel selection process in step 101. Next, in the coordinate conversion process in step 102, the coordinate value of the selected pixel is converted from the coordinate value in the projected coordinate space 41 to the coordinate value in the projected coordinate space 40. This can be done by referring to the coordinate correspondence data generated in the coordinate correspondence data generation processing in step 60 of FIG. The coordinate value of the pixel after conversion is set as a coordinate value 120. Next, in step 103, it is determined whether or not the coordinate value 120 is within the assigned area. True if the coordinate value 120 is on or inside the boundary 70, or false if the coordinate value 120 is not inside the boundary 70. is there. If it is determined to be false, the luminance maintenance rate is set to 0 in step 109 and the process proceeds to step 106. If it is determined to be true, a normalized distance calculation process is performed in step 104. In the present embodiment, the normalized distance takes a value between 0 and 1, and a specific calculation method will be described with reference to FIG. Next, in step 105, a luminance maintenance rate calculation process is performed. The luminance maintenance rate is calculated using a normalized distance function 130 that is 1 when the normalized distance is 0 and 0 when the normalized distance is 1.
[0037]
Specifically, when the normalized distance is D, the function 130 may be implemented using a function such as (1-D). Note that a function using a trigonometric function or the like may be used so that the rate of change changes smoothly. If the luminance maintenance ratio 140 is obtained in step 105 or step 109, next, in step 106, output luminance characteristic function calculation processing is performed. The output luminance characteristic function 150 is a function of the pixel value 160 input to the image modulation projection unit 21 and is a function that returns the luminance value of the video to be projected from the image modulation projection unit 21. The output luminance characteristic function 150 is obtained by subtracting the offset value 321 (that is, the maximum luminance value when “black” is displayed from all the image projecting means) from the target luminance characteristic function 332 and multiplying by the luminance maintenance ratio 140, It can be calculated as the value 321 added.
[0038]
After the output luminance characteristic function is calculated in step 106, next, an output pixel characteristic function calculation process is performed in step 107. The output pixel characteristic function is a function of the pixel value 160 input to the image modulation unit 211 and is a function that returns a pixel value 161 that is an output of the image projection unit 211. For each pixel value 160, the output luminance characteristic function 150 is used to obtain an output luminance value 500, and the characteristic function 320 of the image projecting means 210 is used to perform reverse lookup as shown in FIG. It can be calculated by obtaining the value 502. After the output pixel characteristic function calculation process in step 107 is completed, it is determined in step 108 whether the process has been completed for all the pixels that need to be processed. If there is a pixel for which processing is necessary but processing has not yet been completed, the process returns to the pixel selection processing in step 101, and the blend parameter generation processing is continued. When the process is completed for all the pixels that need to be processed, the blend parameter generation process ends.
[0039]
When generating the image modulation parameter 202, it is not necessary to calculate the normalized distance. Since the sum of the brightness maintenance ratios of the images projected on the same position on the screen is 1, the brightness maintenance ratio is calculated using the coordinate correspondence data by generating the image modulation parameter 212 first. This is because it can.
[0040]
FIG. 10 is a diagram for explaining a normalization distance calculation method in the blend parameter generation processing according to the first embodiment of this invention.
[0041]
In FIG. 10, the side 701 is the left side of the boundary line 70, the side 702 is the upper side of the boundary line 70, the side 711 is the left side of the boundary line 71, and the side 712 is the boundary line 71. It is the upper side. The intersection 82 is an intersection of the side 711 and the side 702, and the intersection 83 is an intersection of the side 712 and the side 701. Further, the area 90 is a quadrangular area defined by the sides 701, 702, the vertex 80, the intersection 81, and the intersection 82, and the area 91 is a quadrangular area defined by the sides 702, 712, the vertex 80, and the intersection 82. The area 92 is a rectangular area defined by the sides 701, 711, the vertex 80 and the intersection 83, and the area 93 is an area inside the boundary line 71 (side 711 and side 712 in FIG. 10). Is a region outside the boundary line 70 (side 701 and side 702 in FIG. 10).
[0042]
At this time, the coordinate value 120 is included in any one of the region 90, the region 91, the region 92, the region 93, or the region 94. In addition, when located on the boundary of these areas, it may be included in any area sharing the boundary. Here, when the coordinate value 120 is included in the region 94, the normalized distance D is 1. When the coordinate value 120 is included in the region 93, the normalized distance D is set to zero. When the coordinate value 120 is included in the region 92, the normalized distance D is a value obtained by dividing the distance from the side 711 by the distance D1. When the coordinate value 120 is included in the area 91, the normalized distance D is a value obtained by dividing the distance from the side 712 by the distance D2.
[0043]
When the coordinate value 120 is included in the area 90, the normalized distance D is obtained as follows. A vector whose starting point is the vertex 80 and whose end point is the coordinate value 120 is a vector V. A vector V1 in which the start point is the vertex 80 and the end point is the intersection 83 is normalized as a vector N1, and a vector V2 in which the start point is the vertex 80 and the end point is the intersection 82 is normalized as a vector N2. And By taking the inner product of the vector V and the vector N1, the component P1 of the vector V in the vector N1 direction is obtained. By taking the inner product of the vector V and the vector N2, the component P2 of the vector V in the vector N2 direction is obtained. When the value obtained by dividing P1 by D1 is Q1, and the value obtained by dividing P2 by D2 is Q2, the value of the square root 180 of the sum of the square of Q1 and the square of Q2 is defined as a normalized distance D. .
[0044]
However, when the value of the square root 180 is larger than 1, it is assumed that the normalized distance D is 1. In the region 90, the set of points having a square root 180 value of 1 is a part of an ellipse centered on the vertex 80 and passing through the intersection 82 and the intersection 83, and the tangent at the intersection 82 is a straight line including the side 702. Yes, the tangent at the intersection 83 is a straight line including the side 701.
[0045]
When the blend parameter generation process at step 64 in FIG. 4 is completed, an image modulation parameter storage process at step 65 is then executed. This saves the parameter for performing the geometric modulation generated in the coordinate-corresponding data generation process in step 60 and the parameter for performing the luminance modulation generated in the blend parameter generation process in step 64. It is processing. This may be directly stored in the image modulation unit 201 and the image modulation unit 211, or an external storage device 280 is prepared, temporarily stored in the external storage device 280, and then image modulated as necessary. You may make it load to the means 201 and the image modulation means 211. FIG.
[0046]
As described above, according to the present embodiment, the shape of the isoluminance line of the blend portion is not a rectangle, but a curve with a rounded vertex portion. Occurrence of bright spots and dark spots in the portion can be suppressed.
[0047]
In the above-described embodiment, the description has been given with respect to the luminance modulation. However, it is needless to say that the image modulation parameters in the present invention may be such that each of the primary colors of RGB is modulated independently. .
[0048]
In the above embodiment, the case where the video area of one image modulation projection means is completely included in the video area of the other image modulation projection means has been described. However, the present invention is limited to such a case. In general, the present invention can be carried out when one vertex of the video area of one image modulation projection means is included in the video area of the other image modulation projection means.
[0049]
According to an embodiment of the present invention, a screen and two image modulation projection means are provided, and the image modulation projection means is installed so as to have an overlapping projection area on the screen, and further, with respect to the original image In the video display apparatus, the image modulated and projected by the image modulation projecting means is displayed to display a smoothly connected video on the screen. On the screen, one of the image modulated projecting means Modulation is performed by the image modulation projection unit when each image modulation projection unit is installed so that the projection region of the other includes one of the vertices of the polygonal projection region of the other image modulation projection unit. Since the isoluminance line shape of the blend part is a rounded curve near the apex, false contours due to the effects of optical synthesis errors and bright / dark spots at the apex part can be used. It can be difficult to be perceived in the eyes of The.
[0050]
【The invention's effect】
According to the present invention, it is possible to display with less optical error in video display using a plurality of projection apparatuses.
[Brief description of the drawings]
FIG. 1 is a flowchart of blend parameter generation processing in a first embodiment of the present invention.
FIG. 2 is a conceptual diagram of an apparatus according to the first embodiment of the present invention.
FIG. 3 is an apparatus configuration diagram according to the first embodiment of the present invention.
FIG. 4 is a flowchart of image modulation parameter generation processing in the first embodiment of the present invention.
FIG. 5 is a diagram showing a relationship between projected coordinate spaces in the first embodiment of the present invention.
FIG. 6 is a diagram for explaining a luminance characteristic function and a target luminance characteristic function in the first embodiment of the present invention.
FIG. 7 is a diagram for explaining a blend region in the first embodiment of the present invention.
FIG. 8 is a diagram illustrating isoluminance lines in a blend region according to the prior art.
FIG. 9 is a diagram showing isoluminance lines in a blend region according to the first embodiment of the present invention.
FIG. 10 is a diagram for explaining a method for calculating a normalized distance in the blend parameter generation processing according to the first embodiment of this invention.
FIG. 11 is a diagram for explaining a conversion method from an output luminance value to an output pixel value in the first embodiment of the present invention.
[Explanation of symbols]
20, 21 ... Image modulation projection means
201, 211 ... Image modulation means
203, 213 ... Image projection means
22 …… Image output means
23 …… Screen

Claims (2)

A screen for projecting an image according to the projection light;
A plurality of projection means each projecting projection light onto the screen to be projected, wherein the projection light projected by a first projection means included in the plurality of projection means forms a polygonal projection region on the screen; Projection means,
Means for detecting a vertex portion entering a projection area of a second projection means included in the plurality of projection means among the vertex portions of the polygon projection area of the first projection means;
An image display apparatus comprising: means for modulating projection light from the first projection means in accordance with the detected vertex portion. The video display device according to claim 1,
The modulating means modulates the radius of curvature of the isoluminance curve of the image corresponding to the projection area other than the apex portion entering the projection area of the second projection means to be a positive value. Video display device.

Images