JP2007322850A - Image signal processing device and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device which corrects difference in color and brightness which a viewer perceives with a ratio of distance from a screen to a viewer to a screen size. <P>SOLUTION: The image display device 1 provided with an image signal pre-processing means for pre-processing a color image signal, and an image display means for displaying an image based on the pre-processed image signal, and comprises: a color space compensation part 100 which calculates and compensates color using spectral visibility characteristics 3, 4 of human body according to viewing angles, and a white balance compensation part 10 which reduces change of white balance in the color space compensation part 100, and can display a video of which the color and brightness can be perceived similarly irrespective of the ratio of the screen size of the image display device to the distance from the screen up to the viewer, by displaying the image signal compensated for a degree of influence by an area effect of color. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image signal processing apparatus and an image display apparatus that correct a difference in color and luminance perceived by an observer based on a ratio of a distance from the screen to the observer with respect to the size of the screen.

  When adjusting an image display device such as a projector or plasma display having a large screen size of 50 inches or 100 inches to a correct color reproduction state, a master monitor having a screen size of about 30 inches is generally used. The brightness and color are adjusted so that the brightness and chromaticity are the same as those of the reference image display apparatus. In general, an image display device that displays a large screen such as a projector or a plasma display in order to obtain a powerful feeling of an image often has a small ratio of the distance from the screen to the observer with respect to the size of the screen.

  However, the human visual sensation looks different depending on the viewing angle even when viewing images with the same chromaticity and the same luminance. This is a phenomenon generally referred to as a color area effect, and the spectral sensitivity of the 2 ° field of view and the 10 ° field of view is determined by the International Commission on Illumination (CIE).

  In other words, if the ratio of the screen size and the distance from the screen to the observer is different, the image display device may appear to be different to the human eye even if the image display device is adjusted to have the same brightness and chromaticity. there were.

  As an improvement measure, an image processing apparatus having brightness correction means has been proposed (see, for example, Patent Document 1). This is an image processing device that scales the input image and outputs the scaled image. The brightness value of the image data before or after scaling is corrected according to the magnification of the scaling. It is what you do.

There is also a method in which a target master monitor is arranged beside a large-screen image display device, and hue, saturation, luminance, etc. are manually adjusted by visual observation while displaying various color charts.
JP 2001-339602 A

  However, the above-described conventional image display device is not subject to variations by humans, such as performing adjustments for visually perceiving the same brightness with the same color in images with different ratios of the screen size and the distance from the screen to the viewer. There was a problem that it was large or could not be done easily.

  An object of the present invention is to provide an image signal processing apparatus and an image display apparatus capable of stably displaying an image signal in which the influence of the color area effect is corrected by a simple method.

  In order to achieve the above object, an image signal processing device according to the present invention is an image signal processing device used as a preprocessing device of an image display device that displays an image based on a color image signal, and an input color Color that calculates the signal value of the image signal using the human spectral visibility characteristics according to the viewing angle, the spectral characteristics of the image display device, the spectral characteristics of the reference image display device, and the viewing angle correction amount Spatial correction means.

  Here, the color image signal mainly means an RGB signal or a YUV signal, but any other type of image signal may be a signal representing a color space.

  The color space correction means uses a human spectral visibility characteristic according to the viewing angle, and calculates and compensates for the color, so that an image connected to the image can be easily and quickly without the need for manual adjustment by visual observation. The color area effect on the screen displayed on the display device can be compensated.

  In addition, the spectral sensitivity characteristics of the 2 ° field of view and the 10 ° field of view determined by the International Commission on Illumination (CIE) are generally used for human spectral sensitivity characteristics according to the viewing angle. Since there is a difference and a change depending on age, any spectral sensitivity characteristics of human beings may be used.

  Furthermore, the chromaticity may change with an achromatic color such as white or gray with only the color space correction means. As a rule of thumb, since the chromaticity change in the achromatic color makes the human looking at the screen feel uncomfortable, a white balance correction means for reducing the change in white balance caused by the color space correction means is provided.

  An image display device according to the present invention is an image display device comprising image signal preprocessing means for preprocessing a color image signal and image display means for displaying an image based on the preprocessed color image signal. The image signal preprocessing means is the image signal processing device.

  According to the image signal processing device and the image display device of the present invention, the signal value of the input color image signal is calculated using a plurality of spectral characteristics, spectral visibility characteristics, and viewing angle correction amounts, Since the area effect can be compensated for, an image that can perceive luminance and color in the same manner can be displayed easily and quickly regardless of the screen size of the image display device and the ratio of the distance from the screen to the observer.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of an image display apparatus according to Embodiment 1 of the present invention. In the figure, an image display device 1 includes an RGB signal input portion, a spectral characteristic storage unit 2 displayed by a reference image display device serving as a reference, a 2 ° visual field spectral sensitivity characteristic storage unit 3, and a 10 ° visual field spectrum. It comprises a visibility characteristic storage unit 4, a spectral characteristic storage unit 5 of the image display device 1, a remote control signal reception unit 6, a control unit 7, a color space correction unit 100, a white balance correction unit 10, and the like.

  The color space correction unit 100 includes an RGB signal, a spectral characteristic storage unit 2 displayed by a reference image display device serving as a reference, a 2 ° visual field spectral sensitivity characteristic storage unit 3, and a 10 ° visual field spectral sensitivity characteristic storage unit 4. And the information from the spectral characteristic memory | storage part 5 of the image display apparatus 1, and the control part 7 is input.

  In addition, the image display device 1 includes a remote control signal receiving unit 6 that inputs the ratio of the screen size of the image display device 1 and the distance from the screen to the observer by remote control, and the color space correction unit 100 via the control unit 7. That information.

  The color space correction unit 100 compensates for the color area effect by means described later, and sends the image signal to the white balance correction unit 10.

  The white balance correction unit 10 corrects luminance and chromaticity in a 2 ° visual field of red, green, blue, and black of the reference image display device in order to correct the achromatic color shift generated by the color space correction unit 100. From the chromaticity of the white combined light and the luminance and chromaticity of the image display device 1 in the wide field of view of red, green, blue and black, the chromaticity of the white combined light is obtained, and the white chromaticity becomes equal. As described above, the gains of red, green, and blue are corrected, and the image signal is sent to the luminance correction unit 11. Here, the gains of red, green, and blue are Gr, Gg, and Gb, respectively, and how to find them will be described. The chromaticity coordinate x of red in the 2 ° field of view of the reference image display device is expressed as Xra, and the chromaticity coordinate y is expressed as Yra (hereinafter, “chromaticity coordinates (Xra, Yra)”. The same applies to other colors. ), The luminance is Kra, the green chromaticity coordinates are (Xga, Yga), the luminance is Kga, the blue chromaticity coordinates are (Xba, Yba), the luminance is Kba, and the black chromaticity coordinates are (Xka). , Yka), luminance is Kka, and white chromaticity coordinates are (Xwa, Ywa). The chromaticity coordinates of red, green, blue, and black in the wide field of view of the image display device 1 are (Xrb, Yrb), (Xgb, Ygb), (Xbb, Ybb), (Xkb, Ykb), respectively, and the luminance Are Krb, Kgb, Kbb, and Kkb, respectively, and the chromaticity coordinates of white combined light obtained by multiplying red, green, and blue by gain are (Xwb, Ywb). The white combined light of each image display device has the following relationships (Expression 1) to (Expression 6) based on the principle of additive color mixing.

  In these equations, if the green gain is set to 1, for example, this simultaneous equation can be solved, and the red gain and the blue gain can be obtained.

  The luminance correction unit 11 is used to correct non-linearity between the gradation in the input signal and the gradation in the display image. The luminance correction unit 11 corrects such non-linearity inside the luminance correction unit 11. A table showing gradation conversion characteristics is provided for each RGB, and gamma correction is executed for each color while referring to the table, and is output to the display device drive unit 12.

  The display device drive unit 12 drives the display device unit 13 such as a liquid crystal display panel or a plasma display panel to form a display image based on the RGB signals subjected to color space correction and white balance correction.

  FIG. 2 is a configuration diagram of the color space correction unit 100 of the present invention. The color space correction unit 100 includes a part for inputting RGB signals, a part for inputting spectral characteristics of red, green, blue, and black of a reference image display device, and a spectral sensitivity characteristic of 2 ° field of view and 10 ° field of view. A portion for inputting spectral characteristics of red, green, blue, and black of the image display device 1 of the present invention, chromaticity / luminance calculation units 101 to 104 for calculating chromaticity and luminance from the spectral characteristics, and 111 to 114, a combined light calculation unit 109 that calculates light combining the chromaticity / luminance of red, green, blue, and black, and red, green, and blue necessary for reproducing the combined light in a wide field of view. An RGB luminance calculation unit 115 for calculating luminance is included.

  FIG. 6 is a graph showing the spectral sensitivity characteristics of the 2 ° field of view. FIG. 7 is a graph showing the spectral sensitivity characteristics of the 10 ° field of view.

  Spectral characteristics when displaying red, green, blue, and black of the reference image display device are input to red, green, blue, and black chromaticity / luminance calculation units 101 to 104 with a 2 ° field of view, respectively. By multiplying and integrating the data input from the spectral visibility characteristic input unit of the 2 ° field of view for each wavelength of 1 nm, the chromaticity and luminance of the 2 ° field of view of red, green, blue, and black are calculated.

  Next, a general calculation method of the chromaticity and luminance will be specifically described. When the spectral characteristic when an arbitrary color is displayed on the image display device is E (λ) and the spectral visibility characteristic is a color matching function x (λ), y (λ), z (λ), The tristimulus values X, Y, and Z can be obtained by (Expression 7) to (Expression 9). Y of the tristimulus value is luminance, and chromaticity coordinates (x, y) can be obtained using (Expression 10) to (Expression 11). In these equations, λ is a wavelength, Km is a constant Km = 683 (lm / W), and integration is performed in a visible wavelength region such as 380 nm to 780 nm.

  Although calculation is performed for each wavelength of 1 nm by the calculation method, other calculation methods such as for each wavelength of 2 nm may be used as long as chromaticity and luminance can be calculated from the spectral characteristics.

  In addition, calculation is performed using luminance and chromaticity as a color space. For example, other colors such as CIELab color space and CIEUV color space defined by the CIE (Commission Internationale de l'Eclairage). You may calculate using space.

  The red, green, and blue image signals input to the color space correction unit 100 are input to the gamma correction unit 105, and are transmitted to the multiplication units 106 to 108 as coefficients of luminance information of red, green, and blue.

  The multipliers 106 to 108 are the luminance obtained by the red / green / blue luminance / chromaticity calculators 101 to 103 in the 2 ° field of view, and the coefficients of the luminance information of red, green, and blue output from the gamma correction unit 105. And the luminances of red, green, and blue that are output when the reference image display device inputs an arbitrary RGB signal are calculated. The multipliers 106 to 108 output these luminances and the chromaticities obtained by the red / green / blue luminance / chromaticity arithmetic units 101 to 103 in the 2 ° field of view to the combined light arithmetic unit 109.

  The combined light calculation unit 109 calculates the principle of additive color mixture of light from the luminance and chromaticity of red, green, blue, and black input from the multiplication units 106 to 108 and the black chromaticity / brightness calculation unit 104 in the 2 ° field of view. The luminance and chromaticity of the combined light used are calculated, and the luminance and chromaticity of the combined light are output to the RGB luminance calculation unit 115. The brightness and chromaticity of the synthesized light are Kw as the brightness of the synthesized light, (Xw, Yw) as the chromaticity coordinates, and Kr, Kg, Kb, Kk, red, and green as the brightness of red, green, blue, and black, respectively. If the chromaticities of blue, blue, and black are (Xr, Yr), (Xg, Yg), (Xb, Yb), and (Xk, Yk), respectively, they can be obtained using (Expression 12) to (Expression 14). .

  On the other hand, from the data input from the spectral visibility characteristics input section of 2 ° field of view, the data input from the spectral sensitivity characteristics input section of 10 ° field of view, the screen size of the image display device, from the screen to the observer The distance ratio information is input to the spectral characteristic synthesis unit 110 through the remote control signal receiving unit 6 as a viewing angle correction amount.

  The spectral characteristic synthesis unit 110 synthesizes by changing the ratio of the spectral visibility characteristic of the 2 ° field of view and the spectral sensitivity characteristic of the 10 ° field of view according to the viewing angle correction amount. Output to the chromaticity / luminance calculation units 111 to 114.

  The wide-field red, green, blue, and black chromaticity / luminance calculation units 111 to 114 calculate the combined spectral visibility characteristics output from the spectral combining unit 110 and the red, green, blue, and black colors of the image display device 1. By multiplying and integrating the spectral characteristics when displayed for each wavelength of 1 nm, the chromaticity and brightness of red, green, blue, and black in a wide field of view are calculated. The calculation uses the same calculation method as the red, green, blue, and black chromaticity / brightness calculation units 101 to 104 having the 2 ° field of view described above.

  The RGB luminance calculation unit combines the chromaticities of red, green, blue, and black in the wide field of view output from the chromaticity / luminance calculation units 111 to 114 of the wide field of view, The luminances of red, green, and blue necessary for achieving chromaticity are calculated using the principle of additive color mixing of light, and the luminances of red, green, and blue are output to the inverse gamma correction unit 116. Next, a specific calculation method will be described. The chromaticity coordinates of red, green, blue, and black in the wide field of view are (Xrw, Yrw), (Xgw, Ygw), (Xbw, Ybw), and (Xkw, Ykw), respectively. The luminances of blue, black, and black are Krw, Kgw, Kbw, and Kkw, respectively. Also, the chromaticity coordinates output from the combined light calculation unit 109 are set to (Xw, Yw), the luminance is set to Kw, and red, green, When the blue gain is Gr, Gg, and Gb, the following relationships (Equation 15) to (Equation 17) hold.

  Therefore, by solving this simultaneous equation, the red, green, and blue gains Gr, Gg, and Gb necessary for achieving the luminance and chromaticity from the combined light calculation unit 109 can be obtained.

  The inverse gamma correction unit 116 performs reverse conversion between the input red, green, and blue luminances and gamma correction that is luminance corrected by the video display device, and outputs red, green, and blue image signals.

(Embodiment 2)
FIG. 3 is a configuration diagram of the image signal processing apparatus according to the second embodiment of the present invention. In the figure, an image signal processing device 200 includes an RGB signal input portion, a spectral characteristic storage unit 2 displayed by a reference image display device serving as a reference, a 2 ° visual field spectral sensitivity characteristic storage unit 3, and a 10 ° visual field. The spectral visibility characteristic storage unit 4, the spectral characteristic storage unit 5 of the image display device 1, the viewing angle setting value input unit 201, the control unit 7, the color space correction unit 100, the white balance correction unit 10, and the like. .

  The color space correction unit 100 includes an RGB signal, a spectral characteristic storage unit 2 displayed by a reference image display device serving as a reference, a 2 ° visual field spectral sensitivity characteristic storage unit 3, and a 10 ° visual field spectral sensitivity characteristic storage unit 4. Then, the spectral characteristic storage unit 5 of the image display device that displays the image signal output from the image signal processing device 200 and information from the control unit 7 are input.

  In addition, the image signal processing device 200 includes a viewing angle setting value input unit 201 that inputs a ratio of the screen size of the image display device that displays the image signal output from the image signal processing device 200 and the distance from the screen to the observer. The information is transmitted to the color space correction unit 100 via the control unit 7.

  The color space correction unit 100 compensates for the color area effect by the means described above, and sends the image signal to the white balance correction unit 10.

  The white balance correction unit 10 corrects luminance and chromaticity in a 2 ° visual field of red, green, blue, and black of the reference image display device in order to correct the achromatic color shift generated by the color space correction unit 100. The color of the white combined light from the chromaticity of the combined light of white to white and the luminance and chromaticity in the wide field of view of red, green, blue and black of the image display device that displays the image signal output from the image signal processing device 200 Then, the gains of red, green and blue are corrected by the above-described means so that the white chromaticities are equal, and are sent to an image display device for displaying an image signal.

(Embodiment 3)
FIG. 4 is a configuration diagram of an image signal processing apparatus in which the white balance correction unit according to the third embodiment of the present invention is incorporated in the color space correction unit. In the figure, an image signal processing device 300 includes a portion for inputting RGB signals, a spectral characteristic storage unit 2 displayed by a reference image display device serving as a reference, a 2 ° visual field spectral sensitivity characteristic storage unit 3, and a 10 ° visual field. The spectral visibility characteristic storage unit 4, the spectral characteristic storage unit 5 of the image display device 1, a viewing angle setting value input unit 201, a control unit 7, a color space correction unit 301, and the like.

  The color space correction unit 301 includes RGB signals, a spectral characteristic storage unit 2 displayed by a reference image display device serving as a reference, a 2 ° visual field spectral sensitivity characteristic storage unit 3, and a 10 ° visual field spectral sensitivity characteristic storage unit 4. Then, the spectral characteristic storage unit 5 of the image display device that displays the image signal output from the image signal processing device 200 and information from the control unit 7 are input.

  In addition, the image signal processing device 300 includes a viewing angle setting value input unit 201 that inputs a ratio of the screen size of the image display device that displays the image signal output from the image signal processing device 300 and the distance from the screen to the observer. The information is transmitted to the color space correction unit 301 via the control unit 7.

  The color space correction unit 301 compensates for the color area effect by means described later, performs white balance correction, and sends the image signal to an image display device that displays the image signal.

  FIG. 5 is a configuration diagram of the color space correction unit 301. The color space correction unit 301 inputs a RGB signal, a part that inputs red, green, blue, and black spectral characteristics of a reference image display device, and a spectral sensitivity characteristic of a 2 ° field of view and a 10 ° field of view. A portion for inputting spectral characteristics of red, green, blue, and black of the image display device 1 of the present invention, chromaticity / luminance calculation units 101 to 104 for calculating chromaticity and luminance from the spectral characteristics, and 111 to 114, a combined light calculation unit 109 for calculating the combined chromaticity / brightness of the calculated red, green, blue and black, and red, green and blue necessary for reproducing the combined light in a wide field of view An RGB luminance calculation unit 115 that calculates the luminance of the white balance correction unit 313 and the like.

  Spectral characteristics when displaying red, green, blue, and black of the reference image display device are input to red, green, blue, and black chromaticity / luminance calculation units 101 to 104 with a 2 ° field of view, respectively. By multiplying and integrating the data input from the spectral visibility characteristic input unit of the 2 ° field of view for each wavelength of 1 nm, the chromaticity and luminance of the 2 ° field of view of red, green, blue, and black are calculated.

  The red, green, and blue image signals input to the color space correction unit 100 are input to the gamma correction unit 105, and are transmitted to the multiplication units 106 to 108 as coefficients of luminance information of red, green, and blue.

  The multipliers 106 to 108 are the luminance and chromaticity obtained by the red, green, and blue luminance / chromaticity arithmetic units 101 to 103 in the 2 ° field of view, and the red, green, and blue luminances output from the gamma correction unit 105. The information coefficient is multiplied, and the luminance and chromaticity of red, green, and blue output when the reference image display apparatus inputs an arbitrary RGB signal are calculated and output to the combined light calculation unit 109.

  The combined light calculation unit 109 uses the principle of additive color mixture of light based on the luminance and chromaticity of red, green, blue, and black input from the multiplication units 106 to 108 and the black chromaticity / luminance calculation unit 104 in the 2 ° field of view. The luminance and chromaticity of the combined light are calculated, and the luminance and chromaticity of the combined light are output to the RGB luminance calculation unit 115.

  On the other hand, the data input from the spectral visibility characteristics input section of 2 ° field of view, the data input from the spectral sensitivity characteristics input section of 10 ° field of view, the screen size of the video display device and the screen to the observer Information on the ratio of the distance is input to the spectral characteristic synthesis unit 110 as a viewing angle correction amount.

  The spectral characteristic synthesis unit 110 synthesizes by changing the ratio of the spectral visibility characteristic of the 2 ° field of view and the spectral visibility characteristic of the 10 ° field of view according to the viewing angle correction amount, and widens the synthesized spectral sensitivity characteristic. Output to the chromaticity / luminance calculation units 111 to 114 of the visual field.

  The wide-field red, green, blue, and black chromaticity / luminance calculation units 111 to 114 calculate the combined spectral visibility characteristics output from the spectral combining unit 110 and the red, green, blue, and black colors of the image display device 1. By multiplying and integrating the spectral characteristics when displayed for each wavelength of 1 nm, the chromaticity and brightness of red, green, blue, and black in a wide field of view are calculated.

  The white chromaticity / luminance calculation unit 311 for the 2 ° field of view is a white color in the 2 ° field of view based on the red, green, blue, and black spectral characteristics of the reference image display device and the spectral visibility characteristic of the 2 ° field of view. The degree and brightness are obtained and output to the white balance correction unit 313.

  The wide-field white chromaticity / luminance calculation unit 312 outputs the red, green, blue, and black spectral characteristics and the spectral characteristic synthesis unit 110 of the image display device that displays the image signal output from the color space correction unit 301. The white chromaticity and luminance in the wide field of view are obtained from the spectral visibility characteristics of the wide field, and are output to the white balance correction unit 313.

  The white balance correction unit 313 uses red, so that the chromaticity obtained by the white chromaticity / brightness computing unit 312 in the wide field of view becomes the chromaticity obtained by the white chromaticity / brightness computing unit 311 in the 2 ° field of view. The brightness balance of green and blue is corrected and output to the RGB brightness calculation unit 115.

  The RGB luminance calculation unit 115 synthesizes the chromaticities of red, green, blue, and black in the wide field of view output from the white balance correction unit 313 to obtain the luminance and chromaticity from the combined light calculation unit 109. The necessary red, green, and blue luminances are calculated using the principle of additive color mixture of light, and the red, green, and blue luminances are output to the inverse gamma correction unit 116.

  The inverse gamma correction unit 116 performs reverse conversion of the input red, green, and blue luminances and gamma correction for luminance correction by the video display device, and outputs red, green, and blue image signals.

  In the above-described embodiments, the spectral characteristics of the reference image device are used for the calculation in the color space correction unit. However, it is not always necessary, and the luminance and chromaticity of the reference image device may be used. Good.

  In these embodiments, the image signal is calculated by the image display device or the image signal processing device as a large amount of information such as the spectral characteristics and spectral visibility characteristics of the image display device. For example, a conversion table may be created in advance to increase the calculation processing speed, and the conversion table may be used.

  Since the image signal processing apparatus and the image display apparatus according to the present invention can compensate for the color area effect, the color and luminance perceived by the observer according to the ratio of the distance from the screen to the observer with respect to the size of the screen. This is useful for an image display apparatus that corrects the difference between the two.

The figure which shows the whole structure of the image display apparatus which concerns on Embodiment 1 of this invention. The figure which shows the structure of the color space correction | amendment part of the image display apparatus which concerns on Embodiment 1 of this invention. The figure which shows the whole structure of the image signal processing apparatus which concerns on Embodiment 2 of this invention. The figure which shows the whole structure of the image signal processing apparatus which took in the white space correction part which concerns on Embodiment 3 of this invention in the color space correction part. The figure which shows the structure of the color space correction | amendment part of the image signal processing apparatus which concerns on Embodiment 3 of this invention. Graph showing spectral visibility characteristics of 2 ° field of view Graph showing spectral visibility characteristics of 10 ° field of view

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image display apparatus 2 Reference | standard image display apparatus spectral characteristic memory | storage part 3 2 degree visual field spectral sensitivity characteristic memory | storage part 4 10 degree visual field spectral visibility characteristic storage part 5 Image display apparatus spectral characteristic memory | storage part 6 Remote control signal receiving part 7 Control part 10 White balance correction unit 11 Luminance correction unit 12 Display device drive unit 13 Display device unit 100, 301 Color space correction unit 101 Red chromaticity / luminance calculation unit of 2 ° field of view 102 Green chromaticity / luminance calculation unit of 2 ° field of view 103 2 ° Field of View Blue Chromaticity / Luminance Calculation Unit 104 2 ° Field of View Black Chromaticity / Luminance Calculation Unit 105 Gamma Correction Unit 106, 107, 108 Multiplying Unit 109 Synthetic Light Calculation Unit 110 Spectral Characteristic Synthesis Unit 111 Wide Field of View Red chromaticity / luminance calculation unit 112 Wide-field green chromaticity / luminance calculation unit 113 Wide-field blue chromaticity / luminance calculation unit 114 Wide-field black chromaticity / luminance calculation unit 115 RG B luminance calculation unit 116 Inverse gamma correction unit 200, 300 Image signal processing device 201 Viewing angle setting value input unit 311 White chromaticity / luminance calculation unit 312 with 2 ° visual field White chromaticity / luminance calculation unit 313 White with wide field of view Balance correction section

Claims (9)

An image signal processing device used as a pre-processing device for an image display device that displays an image based on a color image signal, and the signal value of the input color image signal is converted into a human spectral visibility according to a viewing angle. An image signal processing apparatus comprising: a color space correction unit configured to calculate using characteristics, spectral characteristics of the image display apparatus, and viewing angle correction amount. The image signal processing apparatus according to claim 1, wherein the color space correction unit further calculates using spectral characteristics of the reference image display device or brightness and chromaticity of the reference image display device. The image signal processing apparatus according to claim 1, further comprising a white balance correction unit that corrects a white balance of the color image signal output from the color space correction unit. The image signal processing apparatus according to claim 1, further comprising a white balance correction unit configured to correct a white balance in the color space correction unit. The image signal processing apparatus according to claim 1, wherein the viewing angle correction amount is determined by a ratio of a screen size of the image display apparatus and a distance from the screen to an observer. 3. The image signal processing according to claim 1, wherein the plurality of visual field spectral sensitivity characteristic storage means are 2 ° visual field spectral sensitivity characteristic storage means and 10 ° visual field spectral sensitivity characteristic storage means. apparatus. An image display device comprising: an image signal preprocessing unit that preprocesses a color image signal; and an image display unit that displays an image based on the preprocessed color image signal, wherein the image signal preprocessing unit includes: An image display device, which is the image signal processing device according to any one of 1 to 6. The image display apparatus according to claim 7, further comprising a white balance correction unit that corrects a white balance of the color image signal output from the image signal preprocessing unit. 9. The image display device according to claim 7, wherein the viewing angle correction amount is input by remote control input.

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