JP2008113335A - Video display system, screen, program, and video display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display system capable of displaying a video image with high presence by simple configuration. <P>SOLUTION: In the video display system comprised of a screen 10 and a projector 20 which projects the video image on the screen 10, the screen 10 includes different areas with a plurality of reflection characteristics or transparent characteristics. The projector 20 modulates light of a modulation pixel which is a unit of modulation by a modulation method according to the characteristics of an area on which the modulation pixel is projected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a video display system, a screen, a program, and a video display method.

A conventional projector uses six primary colors, not only RGB (red, green, blue) but also CMY (cyan, magenta, yellow) added to the color wheel (see, for example, Patent Document 1). As a result, the reproducible color gamut is expanded.
In addition, CMY three-color dots are provided on the surface of the gray screen to reduce the influence of stray light (that is, to reduce the reflection of external light) while maintaining a high reflectance or transmittance of the projected image. (For example, refer to Patent Document 2).
JP 2006-178460 A JP 2001-033878 A

  However, the conventional projector has a problem that although the color gamut is widened and the reproducibility of the video is improved and the realistic feeling is increased, the configuration of the apparatus is complicated and the cost is increased. In addition, in conventional screens, the decrease in saturation is suppressed by suppressing the reflection of external light, but since the saturation is not increased, compared to an environment without external light such as a dark room. The reproducibility is not high.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a video display system capable of displaying a video with high presence with a simple configuration.

  The present invention has been made to solve the above-described problems. An image display system according to the present invention is an image display system including a screen and a projector that projects an image on the screen. The screen has a plurality of reflection characteristics. Alternatively, the projector includes regions having different transmission characteristics, and the projector modulates light of the modulation pixel by a modulation method corresponding to the property of the region where the modulation pixel which is a unit of modulation is projected.

  As a result, the video display system of the present invention performs modulation in accordance with a plurality of different reflection characteristics or transmission characteristics of the screen, so that the range of expression is widened, and a highly realistic video can be displayed with a simple configuration. it can.

  The video display system according to the present invention is the video display system described above, wherein the plurality of regions include a broadband region in which the ratio of the emitted light to the incident light is high over the entire wavelength range of visible light, and three RGB colors. It is a narrow-band area | region where the ratio of the emitted light with respect to incident light is high in this wavelength range.

  As a result, the video display system of the present invention can display a highly saturated color in the modulation pixel projected in the narrow band region, so that a highly realistic video can be displayed with a simple configuration. it can.

  The video display system according to the present invention is the video display system described above, wherein the projector includes a video pixel whose saturation is higher than a predetermined threshold in a video pixel which is a unit for designating a color in the input video. When it is determined whether or not there is a video pixel higher than the threshold, each video pixel is displayed as a modulation pixel projected onto the narrowband region, and there is no video pixel higher than the threshold. When the determination is made, each video pixel is displayed by the modulation pixel projected onto the wideband region.

  Also, the video display system of the present invention is the video display system described above, wherein the plurality of regions emits incident light in a wavelength region on a short wavelength side among the wavelength regions of each of the RGB three colors. A short wavelength region where the light ratio is high, and a long wavelength region where the ratio of the emitted light to the incident light is high in the wavelength region on the long wavelength side in which the wavelength regions of each of the RGB three colors are divided into two. Features.

  As a result, the image display system of the present invention displays a highly realistic image with a simple configuration because the combined color of the modulation pixels projected onto the short wavelength region and the long wavelength region is a wide color region. be able to.

  Further, the video display system of the present invention is the video display system described above, wherein the projector has a composite color of the color of the emitted light by the short wavelength region and the color of the emitted light by the front long and short wavelength region, The modulation pixel for the short wavelength region and the modulation pixel for the long wavelength region modulated so as to reproduce the color of the video pixel are projected onto the screen.

  Also, the video display system of the present invention is the video display system described above, wherein the plurality of regions are a pearl region having a large amount of specular reflection and a mat region having a smaller amount of specular reflection and more irregular reflection than the pearl region. It is characterized by that.

  As a result, the video display system of the present invention can express the texture that is different from the modulation pixels projected onto the pearl area and the mat area, and thus can display a highly realistic video with a simple configuration. .

  The video display system of the present invention is the above-described video display system, wherein the projector determines whether or not gloss is required for each pixel of the input video based on information about the input video, and the input video based on the determination. A pixel for displaying each pixel is selected from a pixel projected onto the pearl area and a pixel projected onto the mat area.

  The video display system of the present invention is any one of the video display systems described above, wherein the plurality of regions are arranged in a checkered pattern or a striped pattern.

  The screen of the present invention is characterized in that the screen on which the projector projects an image has a plurality of regions having different reflection characteristics or transmission characteristics.

  Further, the screen of the present invention is the above-described screen, and the plurality of regions include a broadband region in which a ratio of emitted light to incident light is high over the entire wavelength region of visible light, and a wavelength region of each of RGB three colors. The narrow band region is characterized in that the ratio of the emitted light to the incident light is high.

  Further, the screen of the present invention is the above-described screen, wherein the plurality of regions have a ratio of emission light to incident light in a wavelength region on a short wavelength side of the wavelength regions of each of the RGB three colors divided into two. It is characterized by a high short wavelength region and a long wavelength region in which the ratio of the emitted light to the incident light is high in the wavelength region on the long wavelength side among the wavelength regions of each of the three RGB colors.

  Further, the screen of the present invention is the above-described screen, wherein the plurality of regions are a pearl region having a lot of specular reflection and a mat region having a little specular reflection and a lot of irregular reflection than the pearl region. To do.

  Further, the program of the present invention provides a computer provided in a projector that projects an image on a screen having a plurality of areas having different reflection characteristics or transmission characteristics according to the characteristics of the area for projecting the modulation pixel, which is a unit of modulation. The modulation method functions as means for modulating the light of the modulation pixel.

  The video display method of the present invention is a video display method in a projector that projects a video on a screen having a plurality of regions having different reflection characteristics or transmission characteristics, and the projector includes a modulation pixel that is a unit of modulation. A step of modulating the light of the modulation pixel by a modulation method corresponding to the characteristic of the region to be projected is provided.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external view showing a schematic configuration of a video display system according to a first embodiment of the present invention. Reference numeral 10 denotes a screen on which an image is projected, which will be described in detail later, and includes a plurality of regions having different reflection characteristics. Reference numeral 20 denotes light synthesized by modulating each modulation pixel, which is a unit of modulation, for each R (red), G (green), and B (blue) based on color information of each video pixel included in the input video signal. Is a projector that projects the image on the screen 10.

  FIG. 2 is a graph showing the reflection characteristics of light in each region A1 (broadband region) and A2 (narrowband region) of the screen 10 with the horizontal axis representing wavelength and the vertical axis representing reflectance. As shown in FIG. 2, in the area A1 of the screen 10, the reflectance is high over the entire wavelength range of visible light (the reflectance is substantially constant over the entire wavelength range of visible light). Has a high reflectance in each of the RGB three-color wavelength ranges (substantially equivalent to A1), and the reflectance in the other wavelength ranges is lower than that of the RGB three-color wavelength range. The visible wavelength range is, for example, 380 nm to 780 nm, the red wavelength range is, for example, 600 nm to 760 nm, the green wavelength range is, for example, 500 nm to 570 nm, and the blue wavelength range is, for example, 450 nm to 500 nm. It is.

  FIG. 3A is a diagram illustrating an arrangement example of the areas A1 and A2 on the screen 10 having the reflection characteristics illustrated in FIG. As shown in FIG. 2, the area A1 and the area A2 are alternately arranged in a horizontal stripe pattern on the screen 10, but may be a vertical stripe pattern, or a vertical stripe pattern as shown in FIG. Alternatively, a checkered pattern in which the regions A1 and A2 are alternately arranged on both sides may be used. In the present embodiment, among the modulation pixels of the image projected by the projector 20, the modulation pixel of the first horizontal line from the top coincides with the line of the area A1 of the screen 10, and the second horizontal line. , The modulation pixel of the third horizontal line coincides with the line of the area A1, and so on. The projector 20 is arranged at a position where the arrangement of the ten areas A1 and A2 matches.

  FIG. 4 is a diagram showing the color gamut C1 when the projector 20 projects an image on the area A1 of the screen 10 and the color gamut C2 when the image is projected on the area A2 on the xy chromaticity diagram. . As shown in FIG. 4, in the region A2, since the reflectance is high in each of the three colors of RGB, the wavelength is higher than that in the region A1 where the reflectance is high over the entire wavelength range of visible light. The color of the degree can be displayed. For this reason, the color gamut C2 is a triangle in which the vertices of red, green, and blue of the color gamut C1 are spread outward. Thus, the video display system of the present embodiment can reproduce a wider color gamut in the area A2 on the xy chromaticity diagram than in the area A1.

  FIG. 5 is a schematic block diagram showing the configuration of the projection optical system unit in the projector 20. Reference numeral 100 denotes a light source comprising a lamp such as a high-pressure mercury lamp and a uniformizing means for uniformizing light emitted from the lamp. 101 receives light emitted from the light source 100, transmits R (red) component light, and reflects cyan light composed of the remaining G (green) component and B (blue) components. (Red) C (Cyan) separation element. Reference numeral 102 denotes a mirror that reflects the R component light transmitted through the RC separation element 101. Reference numeral 103 denotes an R light valve that performs R-component color modulation by transmitting R-component light reflected by the mirror 102 at a transmittance set for each modulation pixel by a control system described later.

  Reference numeral 104 denotes a G (Green) B (Blue) separation element that receives cyan light reflected by the RC separation element 101, reflects only the G component light, and transmits the remaining B component light. Reference numeral 105 denotes a G light valve that performs color modulation of the G component by transmitting the G component light reflected by the GB separation element 104 at a transmittance set for each modulation pixel by a control system described later. 106 transmits the R component light and reflects the G component light, thereby combining the R component light color-modulated by the R light valve 103 and the G component light color-modulated by the G light valve 105. It is an RG synthesis element.

  Reference numeral 107 denotes a B light valve that performs color modulation of the B component by transmitting the B component light transmitted by the GB separation element 104 at the transmittance set for each modulation pixel by a control system described later. Reference numeral 108 denotes a mirror that reflects the B component light color-modulated by the B light valve 107. Reference numeral 109 reflects the B component light reflected by the mirror 108 and transmits yellow light composed of the R component and G component synthesized by the RG synthesis element 106, thereby synthesizing these lights B (Blue). ) Y (Yellow) composite element. Reference numeral 110 denotes a projection lens that projects the light combined by the BY combining element 109 onto the screen 10.

  FIG. 6 is a schematic block diagram illustrating a configuration of a control system unit in the projector 20. In the figure, the same reference numerals are given to the portions corresponding to the respective portions in FIG. Reference numeral 200 denotes a video input unit that receives a video signal input to the projector 20. 201 receives a video signal received by the video input unit 200 and determines the transmittance of each light valve in each modulation pixel (a value obtained by dividing the amount of emitted light by the amount of incident light) based on the color of the video pixel of the video signal. This is a color analyzing unit. Details will be described with reference to the flowchart of FIG. 202, the drive voltage at which the transmittance of the R light valve 103, the G light valve 105, and the B light valve 107 becomes the transmittance of each light valve determined by the color analysis unit 201 is determined for each light valve. It is an RGB light valve drive unit that drives each light valve with a drive voltage. Reference numeral 203 denotes an RGB light valve in which the R light valve 103, the G light valve 105, and the B light valve 107 are collectively shown for convenience.

  FIG. 7 is a flowchart for explaining the operation of the projector 20. The video input unit 200 receives the video signal input to the projector 20 (Sa1). The color analysis unit 201 calculates the saturation of each video pixel of the video signal received by the video input unit 200, and compares the saturation with a predetermined threshold (Sa2). If the result of the comparison in step Sa2 is that there is a video pixel with a saturation exceeding the threshold value (Sa3), the color analysis unit 201 proceeds to step Sa4 and sets all the transmittances of the modulation pixels in the odd-numbered lines. “0” is set (Sa4). That is, the modulation pixels on the odd-numbered lines are black. In addition, the color analysis unit 201 sets a value corresponding to the color information of the video pixel of the video signal as the transmittance of the modulation pixel of the even-numbered line. Next, the RGB light valve driving unit 202 drives the R light valve 103, the G light valve 105, and the B light valve 107 based on the video signal processed by the color analysis unit 201 (Sa6).

  On the other hand, as a result of the comparison in step Sa2, if there is no pixel with saturation exceeding the threshold value (Sa3), the color analysis unit 201 transitions to step Sa5 to change the transmittance of the even-numbered line modulation pixels. All are set to “0” (Sa5). That is, the even-numbered line of modulation pixels is black. In addition, the color analysis unit 201 sets a value corresponding to the color information of the video pixel of the video signal as the transmittance of the modulation pixel of the odd-numbered line. The RGB light valve driving unit 202 drives the R light valve 103, the G light valve 105, and the B light valve 107 based on the video signal processed by the color analysis unit 201 (Sa6).

  When there is a highly saturated pixel in the video signal by the processing of step Sa3 and step Sa4, the area A1 on the odd-numbered line of the screen 10 is black, that is, the area on the even-numbered line where light is not projected. A2 projects color light based on the video signal. When there is no pixel with high saturation in the video signal by the processing of step Sa3 and step Sa5, the area A2 on the even-numbered line of the screen 10 is black, that is, the area on the odd-numbered line where light is not projected. A1 projects color light based on the video signal. In other words, when there is a highly saturated pixel in the video signal, the image is projected onto the area A1 in which the reflected light has a wide color gamut, so that a high color image with a wide color gamut can be reproduced. Can do.

In other words, the projector 20 of the present embodiment changes the modulation method in accordance with the characteristics of the region where the light of the modulation pixel is projected. In addition, since the total reflectance of the entire visible light region is lower in the region A2 than in the region A1, the light of the modulation pixel projected in the region A1 when there is no highly saturated pixel. By modulating to display the video, a bright video can be displayed.
In the present embodiment, the screen 10 is described as a reflective screen, but may be a transmissive screen. In this case, the region A1 has a high transmittance over the entire wavelength range of visible light (the transmittance is substantially constant over the entire wavelength range of visible light), and the region A2 includes the respective wavelength regions of the three RGB colors. The transmittance is high (substantially the same as A1), and the transmittance is lower in the other wavelength regions than in the RGB three-color wavelength region.

[Second Embodiment]
The second embodiment of the present invention will be described below with reference to the drawings. FIG. 8 is an external view showing a schematic configuration of a video display system according to the second embodiment of the present invention. Reference numeral 11 denotes a screen on which an image is projected. Although the details will be described later, the areas have mutually different reflection characteristics, and are areas A3 and A2 arranged at positions corresponding to the area A1 of the screen 10 in FIG. And an area A4 arranged at a position corresponding to However, the reflection characteristics in the regions A3 and A4 are different from those in the regions A1 and A2. 21 is a light which is modulated and synthesized for each R (red), G (green) and B (blue) for each modulation pixel which is a unit of modulation based on the color information of each video pixel included in the input video signal. Is a projector that projects the image on the screen 10.

  FIG. 9 is a graph showing the light reflection characteristics in the regions A3 and A4 of the screen 11 with the wavelength on the horizontal axis and the reflectance on the vertical axis. As shown in FIG. 9, in the region A3 (short wavelength region) of the screen 11, the RGB three colors, each wavelength region divided into halves, the wavelength region on the short wavelength side is more reflective than the other wavelength regions. In the region A4 (long-wavelength region), the reflectance is higher in the wavelength region on the long-wavelength side among the RGB three colors and the respective wavelength regions in half, compared to the other wavelength regions. In the screen 11, as in the screen 10, the areas A <b> 3 and the areas A <b> 4 are alternately arranged in a horizontal stripe shape.

  FIG. 10 is a diagram showing the color gamut C3 when the projector 21 projects an image on the area A3 of the screen 11 and the color gamut C4 when the image is projected on the area A4 on the xy chromaticity diagram. . For example, when green light is projected onto the screen 11, the reflected light in the region A 3 is shifted to the short wavelength side, so that it is green closer to cyan, and the reflected light in the region A 4 is shifted to the longer wavelength side, so that it is closer to orange. Become. The triangle of the color gamut C3 due to the reflected light of the area A3 is in a position rotated counterclockwise from the triangle of the color gamut C1 due to the reflected light of the area A1 in the first embodiment, and each vertex is outside the color gamut C1. It is in. Further, the triangle of the color gamut C4 by the reflected light of the area A4 is at a position obtained by rotating the triangle of the color gamut C1 clockwise, and each vertex is outside the color gamut C1.

  FIG. 11 is a schematic block diagram illustrating a configuration of a control system unit in the projector 21. In the figure, portions corresponding to the respective portions in FIG. Further, the configuration of the projection optical system unit in the projector 21 is the same as that shown in FIG. 211 receives a video signal received by the video input unit 200 and determines the transmittance of each light valve in each modulation pixel (a value obtained by dividing the amount of emitted light by the amount of incident light) based on the color of the video pixel of the video signal. This is a color analyzing unit.

FIG. 12 is a flowchart for explaining the operation of the projector 21. This flowchart describes the operation for the projector 21 to display one still image that constitutes a video image based on the input video signal. By repeating the process of this flowchart, a still image is continuously displayed to obtain a video. The video input unit 200 receives the video signal input to the projector 21 (Sb1). The color analysis unit 211 calculates the saturation of each video pixel of the video signal received by the video input unit 200, and compares the saturation with a predetermined threshold (Sb2). If the result of the comparison in step Sb2 is that there is a video pixel with saturation exceeding the threshold value (Sb3), the color analysis unit 211 transitions to step Sb4 and repeats steps Sb4 to Sb8 for one screen. First, in step Sb4, the color analysis unit 211 acquires color information (RGB values) of two pixels arranged vertically from the video signal (Sb4). The color analysis unit 211 takes the average of the obtained color information of the two pixels, performs gamma processing on the average RGB value, and then converts the average RGB value into an XYZ value of the CIE (International Lighting Commission) color system (Sb5). In the present embodiment, RGB values are each represented by 8 bits (0 to 255), and the color analysis unit 211 performs gamma processing using the following equations (1), (2), and (3). .
r = (R / 255) ^ 2.2 (1)
g = (G / 255) ^ 2.2 (2)
b = (B / 255) ^ 2.2 (3)
Here, the values R, G, and B are the values of the R component, the G component, and the B component of the video signal, respectively, and the values r, g, and b are the values of the R component, the G component, and the B component after gamma processing, respectively. Value. “^” Is an operator representing a power.

The color analysis unit 211 uses the following formulas (4), (5), and (6) for the values r, g, and b calculated by the formulas (1), (2), and (3) to obtain XYZ. Convert to value.
X = 0.607r + 0.174g + 0.200b (4)
Y = 0.299r + 0.587 g + 0.114b (5)
Z = 0.000r + 0.066g + 1.116b (6)

  The color analysis unit 211 includes a 3D (three-dimensional) -LUT (Look Up Table) (details will be described later) in which XYZ values and RGB values for two vertical pixels are stored in association with each other. With reference to the 3D-LUT, RGB values (R1, G1, B1, R2, G2, B2) for two pixels corresponding to the XYZ values obtained in step Sb5 are acquired (Sb6). Of the RGB values acquired in step Sb6, R1, G1, and B1 are assigned to the upper pixel of the two vertical pixels, and R2, G2, and B2 are assigned to the lower pixel (Sb7). These processes are repeated until all the pixels on one screen are performed (Sb8). The RGB light valve driving unit 202 drives the RGB light valve 203 with the RGB value assigned to each modulation pixel in step Sb7 (Sb9). Steps Sb1 to Sb9 are performed on each image of the video signal, and the video is projected and displayed on the screen 11.

  On the other hand, as a result of the comparison in step Sb2, when there is no pixel with saturation exceeding the threshold value (Sb3), the color analysis unit 211 calculates the color information (RGB value) of the video signal received by the video input unit 200. The RGB light valve driving unit 202 is notified as it is, and the RGB light valve driving unit 202 drives the RGB light valve 203 according to the RGB values (Sb9). At this time, the color gamut is the same as in the prior art.

  It has been described that the saturation of each video pixel is compared with the threshold value in step Sb2 for each still image constituting the video, and branching is performed in step Sb3 according to the result, but only for the first predetermined number of images. When the processes of steps Sb2 and Sb3 are performed, and there is a video pixel with a saturation exceeding the threshold in the predetermined number, the subsequent process of step Sb2 is not performed and step Sb4 is performed. You may make it transition to. Further, the color analysis unit 211 may accept an input by a user operation, and the color analysis unit 211 may determine whether or not to proceed to step Sb4 according to the input.

  The 3D-LUT used in step Sb6 will be described. FIG. 13 shows red, green, and blue vertices R1, G1, and B1 of the triangular color gamut C3 by the region A3 and red, green, and blue vertices R2, G2, and B2 of the triangular color gamut C4 by the region A4. It is an xy chromaticity diagram. In the present embodiment, the combined color obtained by combining the reflected light of the region A3 and the reflected light of the region A4 is within the hexagonal color gamut C5 connecting the vertices R1, R2, B1, B2, G1, and G2. Use to realize a wide color gamut. For example, in the case of the target color T in FIG. 13, since it is within the triangle connecting the vertices G1, G2, and B2, the reflected light of the green color (vertex G1) of the region A3 and the green color (vertex G2) and blue of the region A4 It can be reproduced with a composite color with the reflected light at (vertex B2). By utilizing this, in the present embodiment, of the two vertical pixels, the upper modulation pixel projected onto the area A3 is driven so that only the G light valve 105 transmits light and projected onto the area A4. The lower modulation pixel is driven so that the G light valve 105 and the B light valve 107 transmit light.

In order to drive in this way, the 3D-LUT, as an example of a part of the stored contents shown in FIG. 14, is a combination of XYZ values and the corresponding R light valve 103 of the upper (region A3) modulation pixel. Transmittance Rt1, transmittance Gt1 of the G light valve 105, transmittance Bt1 of the B light valve 107, transmittance Rt2 of the R light valve 103 of the lower (region A4) modulation pixel, transmittance Gt2 of the G light valve 105, The transmittance Bt2 of the B light valve 107 is stored in association with each other. The 3D-LUT associates the combinations and the corresponding transmittances Rt1, Gt1, Bt1, Rt2, Gt2, and Bt2 with respect to the XYZ values of all the combinations as in the example of stored contents shown in FIG. I remember it.
In the present embodiment, as shown in FIG. 13, the color gamut C5 is connected to the triangle connecting the vertices G1, G2, and B2, the triangle connecting the vertices G2, B2, and R2, and the vertex G2, R1, and R2. The triangle is divided into triangles and triangles connecting the vertices R2, B1, and B2, and the colors that fall within the triangles are modulated by the light valve corresponding to the vertices of the triangles to reproduce the colors.

  FIG. 15 illustrates a modulation pixel of light transmitted through the RGB light valve 203 driven by the RGB light valve driving unit 202 so that the color analysis unit 211 determines the transmittance based on the 3D-LUT and the determined transmittance is obtained. FIG. 6 is a diagram illustrating a relationship between the modulation pixel and a position at which the modulation pixel is projected on the screen 11. As described above, the light of the modulation pixel modulated by the transmittances Rt1, Gt1, and Bt1 is projected on the region A3, and the light of the modulation pixel modulated by the transmittances Rt2, Gt2, and Bt2 is projected on the region A4. Is done. As a result, the combined color of the light obtained by reflecting the light of these two modulation pixels on the screen 11 is an XYZ value color referring to the 3D-LUT, and is the average of the two vertical pixels acquired from the video signal. Become a color.

  As described above, in the video display system according to the present embodiment, when the light transmitted through the R light valve 103 is reflected by the region A3 of the screen 11, the color of the light becomes the vertex R1 on the xy chromaticity diagram, and the region A4. The color of the light when reflected at is the vertex R2, and similarly, the G light valve 105 and the B light valve 107 are also the vertex G1, G2, B1, and B2. By reproducing the colors, a wide color gamut having a hexagonal shape connecting the vertices R1, R2, B1, B2, G1, G2 in FIG. 13 as the color gamut can be realized without using a special projection optical system. .

  In the present embodiment, the color analysis unit 211 is described as including a 3D-LUT and obtaining the transmittance with reference to the 3D-LUT, but the transmittance may be calculated from the XYZ values. . At this time, the color analysis unit 211 has an xy chromaticity represented by an XYZ value in any of four triangles obtained by dividing a hexagon connecting the vertices R1, R2, B1, B2, G1, and G2 shown in FIG. The transmittance for modulating the light valve corresponding to the vertex of the triangle of the determination result is calculated. That is, for each light valve, only the light valve has the maximum transmittance, and the XYZ values of the reflected light when the transmittance of the other light valve is “0” are considered as vectors, and the vectors of the three light valves to be modulated are Since the coefficient of each vector that becomes the XYZ value of the displayed color when combined is the transmittance, these are calculated.

  Also in the second embodiment, a transmissive screen may be used as in the first embodiment. In the present embodiment, since the number of image pixels of the image signal is the same as the number of modulation pixels to be projected, the two vertically aligned images are averaged with respect to the average of the XYZ values of the two vertically aligned image pixels. Although it has been described that the transmittance of each light valve of a modulation pixel is obtained, if the number of modulation pixels is twice the number of video pixels in the vertical direction, it is aligned vertically with respect to the XYZ values of each video pixel. Alternatively, the transmittance of each light valve of two modulation pixels may be obtained.

[Third Embodiment]
The third embodiment is a modification of the first embodiment, and differs from the first embodiment in the characteristics of each area of the screen 10 and the method of determining the projection destination area in the color analysis unit 201. The screen 10 according to the present embodiment includes two types of regions having different characteristics. One is a mat-type region A5 (not glossy) because the proportion of specular reflection of incident light is smaller and the proportion of irregular reflection is larger. Matte region), and the other is a glossy pearl-based region A6 (pearl region) because the ratio of specular reflection of incident light is large and the proportion of irregular reflection is small. These regions A5 and A6 are arranged in a horizontal stripe pattern as in the first and second embodiments.
The projector 20 according to the present embodiment receives, together with the video signal, metadata (information related to the input video) indicating whether or not what is displayed by each pixel of the video signal has gloss. Based on the metadata, the color analysis unit 201 of the present embodiment determines that the pixel is glossy and is on the odd-numbered line projected on the area A5, black (transmittance of all light valves). "0"). Similarly, when the pixel does not have gloss and is on an even-numbered line projected on the area A6, the pixel is black. As a result, in the image displayed as shown in FIG. 16, the portion displaying the glossy water surface or the like is displayed by the modulation pixel projected on the pearl-type area A6, and the glossless sky, etc. Since the portion displaying is displayed by the modulation pixels projected onto the mat-type region A5, it is possible to obtain an image with increased realism.

  Note that the color analysis units 201 and 211 may be realized by dedicated hardware, and each of these units includes a memory and a CPU (central processing unit), and realizes the functions of these units. The function may be realized by loading the program for loading into the memory and executing the program.

  Further, a program for realizing the functions of the color analysis unit 201 or the color analysis unit 211 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. Thus, the processing of each of these units may be performed, and the result may be input to the projector. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within a scope not departing from the gist of the present invention.

  The present invention is suitable for use in a video display system that realizes high-realistic image quality, but is not limited thereto.

1 is an external view showing a schematic configuration of a video display system according to a first embodiment of the present invention. It is the graph showing the reflective characteristic of the light in each area | region A1, A2 of the screen 10 in the embodiment. It is the figure which showed the example of arrangement | positioning of area | region A1, A2 to the screen 10 in the embodiment. FIG. 4 is a diagram showing, on the xy chromaticity diagram, a color gamut C1 when an image is projected onto an area A1 and a color gamut C2 when an image is projected onto an area A2. It is a schematic block diagram which shows the structure of the projection optical system part of the projector 20 in the embodiment. FIG. 2 is a schematic block diagram illustrating a configuration of a control system unit in the projector 20 in the same embodiment. 6 is a flowchart illustrating an operation of the projector 20 in the embodiment. It is an external view which shows schematic structure of the video display system by 2nd Embodiment of this invention. It is the graph showing the reflective characteristic of the light in each area | region A1, A2 of the screen 10 in the embodiment. 4 is an xy chromaticity diagram showing a color gamut C3 by a region A3 and a color gamut C4 by a region A4 in the same embodiment. FIG. It is a schematic block diagram which shows the structure of the control system part of the projectors 21 in the embodiment. 6 is a flowchart illustrating an operation of a projector 21 in the same embodiment. 4 is an xy chromaticity diagram showing vertices R1, G1, and B1 of a color gamut C3 by a region A3 and vertices R2, G2, and B2 of a color gamut C4 by a region A4 in the same embodiment. FIG. It is an example of a part of storage content of 3D-LUT in simultaneous embodiment. It is the figure which showed the relationship between the modulation | alteration pixel and projection position in simultaneous embodiment. It is an example of the display image in 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 11 ... Screen 20, 21 ... Projector 100 ... Light source 101 ... RC separation element 102, 108 ... Mirror 103 ... R light valve 104 ... GB separation element 105 ... G light valve 106 ... RG composition element 107 ... B light valve 109 ... BY synthesis element 110 ... projection lens 200 ... video input unit 201, 211 ... color analysis unit 202 ... RGB light valve driving unit 203 ... RGB light valve

Claims (14)

In an image display system comprising a screen and a projector that projects an image on the screen,
The screen includes a plurality of regions having different reflection characteristics or transmission characteristics,
The video display system, wherein the projector modulates light of the modulation pixel by a modulation method corresponding to the characteristic of a region where the modulation pixel which is a unit of modulation is projected.   The plurality of regions are a wide band region in which the ratio of the emitted light to the incident light is high over the entire wavelength range of visible light, and a narrow band region in which the ratio of the emitted light to the incident light is high in each wavelength region of RGB three colors. The video display system according to claim 1.   The projector determines whether or not there is a video pixel whose saturation is higher than a predetermined threshold in a video pixel which is a unit for specifying a color in the input video, and determines that there is a video pixel higher than the threshold. When each image pixel is displayed by the modulation pixel projected to the narrow band region, and when it is determined that there is no image pixel higher than the threshold value, each image pixel is displayed by the modulation pixel projected to the wide band region. The video display system according to claim 2, wherein:   The plurality of regions include a region near the short wavelength where the ratio of the emitted light to the incident light is high in the wavelength region on the short wavelength side of the wavelength region of each of the RGB three colors divided into two, and the wavelength region of each of the RGB three colors is 2 2. The video display system according to claim 1, wherein the ratio of the emitted light to the incident light is a region near the long wavelength in the wavelength region on the long wavelength side among the two divided.   The projector is configured to convert the color of the image pixel to reproduce the color of the video pixel by a composite color of the color of the emitted light by the region near the short wavelength and the color of the emitted light by the previous long and short wavelength region. The video display system according to claim 4, wherein the modulation pixel and the modulation pixel toward the long wavelength region are projected onto the screen.   2. The video display system according to claim 1, wherein the plurality of regions are a pearl region having a large amount of specular reflection and a mat region having a smaller amount of specular reflection and more irregular reflection than the pearl region.   The projector determines whether or not gloss is required for each pixel of the input video based on the information about the input video, and based on the determination, the pixel that displays each pixel of the input video is the pixel projected on the pearl region and the pixel The video display system according to claim 6, wherein the video display system is selected from pixels projected onto the mat area.   The video display system according to any one of claims 1 to 7, wherein the plurality of regions are arranged in a checkered pattern or a striped pattern.   A screen on which a projector projects an image, comprising a plurality of regions having different reflection characteristics or transmission characteristics.   The plurality of regions are a wide band region in which the ratio of the emitted light to the incident light is high over the entire wavelength range of visible light, and a narrow band region in which the ratio of the emitted light to the incident light is high in each wavelength region of RGB three colors. The screen according to claim 9.   The plurality of regions include a region near the short wavelength where the ratio of the emitted light to the incident light is high in the wavelength region on the short wavelength side of the wavelength region of each of the RGB three colors divided into two, and the wavelength region of each of the RGB three colors is 2 10. The screen according to claim 9, wherein the screen is a region near the long wavelength where the ratio of the emitted light to the incident light is high in the wavelength region on the long wavelength side among the two divided.   10. The screen according to claim 9, wherein the plurality of regions are a pearl region having a large amount of specular reflection and a mat region having a smaller amount of specular reflection and more irregular reflection than the pearl region. A computer provided in a projector that projects an image on a screen having a plurality of areas having different reflection characteristics or transmission characteristics,
A program for functioning as means for modulating light of a modulation pixel by a modulation method corresponding to the characteristic of a region where a modulation pixel which is a unit of modulation is projected. An image display method in a projector that projects an image on a screen having a plurality of areas having different reflection characteristics or transmission characteristics,
An image display method comprising: a step in which the projector modulates light of a modulation pixel by a modulation method corresponding to the characteristic of a region where a modulation pixel that is a unit of modulation is projected.

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