JP5517594B2 - Image display device and image display method - Google Patents

Description

  The present invention relates to an image display device capable of correcting an input signal so as to improve visibility according to a viewing environment of a viewer and displaying the correction signal on a screen.

  2. Description of the Related Art Conventionally, there is an image display device that corrects an input signal according to the brightness of a peripheral visual field of a display device such as a display or a television device, and displays the correction signal on a screen. For example, Patent Document 1 proposes a method of detecting the illuminance around the display device and correcting the RGB value of the input signal based on the correction coefficient for the illuminance using a table indicating the relationship between the illuminance and the correction coefficient. . Patent Document 2 proposes a method for detecting color information of a projected image and correcting the projected image so that a desired color appears as an image display device that takes into account the influence of the screen color and ambient ambient light. Has been.

JP 2007-248936 A JP 2003-323610 A

  However, since the correction method described in Patent Document 1 cannot take into account the color information of the peripheral visual field of the display device, it may not always be displayed properly depending on the surrounding color such as the wall color. For example, it is known that even if the output signal of the display device is the same, if the surrounding color such as the wall color is different, the color appearance is different due to the contrast effect with the surrounding color. As contrast effects, brightness contrast, saturation contrast, color relative ratio, and the like are known. The color relative ratio is a phenomenon in which the hue of the same color appears to change depending on adjacent colors. When a person sees the center color while adapting to the background color, a complementary color of the background color is added psychologically, and the hue appears to change by mixing with the center color. For this reason, there is a problem that the display is not necessarily performed properly when the surrounding color such as the wall color is different.

  On the other hand, in the correction method described in Patent Document 2, although the screen color and ambient ambient light that directly affect the projected image are taken into consideration, as in Patent Document 1, the contrast effect by the color of the peripheral visual field of the projected image is also achieved. Was not considered. For this reason, there is a problem that the display is not necessarily performed properly when the colors around the projection image are different.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a suitable image display by suppressing the contrast effect due to the color of the peripheral visual field of the display device.

In order to solve the above problems, an image display device according to the present invention is an image display device including a display unit, and includes an acquisition unit that acquires wall color information around the image display device, and an input unit that inputs a video signal. Color difference acquisition for acquiring, as color difference information, an average value of UV values among YUV values, which are luminance color difference values of pixels whose luminance Y is greater than or equal to a threshold among the pixels of the video frame based on the video signal input by the input means And correction means for correcting the input video signal using wall color information acquired by the acquisition means and color difference information acquired by the color difference acquisition means. Based on the color perceived from the video displayed on the display unit based on the video signal not corrected, the color perceived from the video displayed on the display unit. With wall color side is close to the color the perceived corrected from non image displayed based on the video signal in the case of achromatic, the color difference obtaining means strong red component than the first color difference information When the second color difference information is acquired , the wall color information is more easily perceived from the video displayed on the display unit than when the color difference acquisition unit acquires the first color difference information. And a correction unit that corrects the video signal using the color difference information, and an output unit that outputs the video signal corrected by the correction unit to the display unit.

  The present invention controls the color balance of the display device according to the color of the peripheral visual field of the display device, thereby suppressing the contrast effect due to the color of the peripheral visual field and providing a suitable image display.

1 is a block diagram showing a system configuration example of a moving image processing apparatus according to an embodiment of the present invention. 1 is a block diagram of an image display device in Embodiment 1. FIG. The figure explaining the method of acquiring wall color information with a sensor. The figure explaining the method of acquiring wall color information by a user's instruction | indication. It is a block diagram which shows the structure of a white reference | standard calculation part. The flowchart explaining the calculation method of an adaptation point. The flowchart explaining the calculation method of the adaptation point with respect to an achromatic wall. The figure explaining the calculation method of the adaptation point with respect to an achromatic wall. The flowchart explaining the calculation method of the adaptation point with respect to the color of a peripheral visual field. The figure explaining the calculation method of the adaptation point with respect to the color of a peripheral visual field. FIG. 4 is a block diagram illustrating details of an image display device according to a second embodiment. 9 is a flowchart for explaining a method for calculating an adaptation point for a color of a peripheral visual field in the second embodiment.

  Hereinafter, the present invention will be described in detail based on the preferred embodiments with reference to the accompanying drawings. The configurations shown in the following embodiments are merely examples, and the present invention is not limited to the illustrated configurations.

<Embodiment 1>
FIG. 1 is a block diagram showing the configuration of the image processing apparatus of this embodiment. The analog broadcast input terminal 101 is a terminal for inputting analog broadcast signals such as terrestrial analog broadcast and satellite analog broadcast. The analog external input terminal 102 is a terminal for inputting an analog video signal such as a D terminal. The digital broadcast input terminal 103 is a terminal for inputting digital broadcast signals such as terrestrial digital broadcast and satellite digital broadcast. The digital external input terminal 104 is a terminal for inputting a digital video signal such as HDMI. The analog tuner 105 is a device for converting an analog broadcast signal into a video signal. The digital tuner 106 is a device for converting a digital broadcast signal into a video signal. The A / D converter 107 is a device for converting an analog video signal into a digital video signal. The decoder 108 is a device for decoding an encoded video signal such as MPEG. The selector 109 is a device that selects and outputs an A / D converted video signal or a decoded video signal. The high image quality conversion correction processing unit 110 is a device that performs high image quality correction on a video signal based on given parameters, and performs, for example, noise reduction, I / P conversion, color correction, and the like. The CPU 111 is involved in all the processes described above. The ROM 112 and the RAM 113 provide the CPU 111 with programs, data, work areas, and the like necessary for the processing. The operation unit 114 is a device for inputting an instruction from a user on the display body, and corresponds to a button, a touch panel, or the like. The ambient light input terminal 117 is a terminal for inputting ambient light such as sunlight or a fluorescent lamp. The ambient light sensor 115 is a device for converting the input ambient light into some value. The remote control 118 is a remote control device for the user to operate the display. The remote control light receiving sensor 116 is a device for receiving a signal from the remote control. The display unit 119 is a device for displaying a video signal that has been subjected to image quality enhancement, correction, and the like.

  The moving image processing operation in the above configuration will be described with reference to FIG.

  The ambient color information acquisition unit 201 is realized by the ambient light sensor 115, the correction processing unit 202, the white reference calculation unit 203, and the parameter register 204 are realized by the high image quality conversion correction processing unit 110, and the adaptation calculation unit 205 is realized by the CPU 111. The

  Next, the overall processing flow of the image display apparatus of this embodiment will be described.

  First, the peripheral color information acquisition unit 201 acquires illumination information and wall color information and stores them in the RAM 113. Here, the illumination information is information acquired by the ambient light sensor 115 and includes illumination illuminance and chromaticity information u ′ and v ′. The chromaticity information u 'and v' are values on the u'v 'plane calculated from XYZ stimulus values defined by the International Commission on Illumination (CIE). In this embodiment, the chromaticity information is a value on the u′v ′ plane, but may be a value on the xy plane, a value on the uv plane, or an XYZ stimulus value itself. The wall color information is color information around the image display device, and is composed of luminance and chromaticity information u ′ and v ′. A method for acquiring wall color information will be described later.

Next, the white reference calculation unit 203 calculates a white reference from the input video signal and stores it in the RAM 113. As the white reference, a color having the highest brightness that can be displayed by the image display device is usually adopted. For example, in the case of an image display device compliant with the sRGB standard, the white reference is a chromaticity point of D65.
In addition, the color with the highest brightness in the display image may be adopted as the white reference. Here, the white reference of the present invention is composed of luminance and chromaticity information u ′ and v ′ calculated from the video signal. In the present embodiment, the chromaticity information is a value on the u′v ′ plane, but may be a value on the xy plane, a value on the uv plane, or an XYZ stimulus value itself. A method for calculating the white reference will be described later.

  The adaptation calculation unit 205 calculates an adaptation point for the achromatic wall and an adaptation point for the color of the peripheral visual field based on the illumination information stored in the RAM 113 and the white reference, and stores the adaptation point in the parameter register 204. . The human eye usually perceives the color with the highest brightness as white (adaptation), but when the color with the highest brightness is a chromatic color, a phenomenon that does not fully adapt (incomplete adaptation) occurs. In addition, a phenomenon (partial adaptation) in which the color perceived as white changes due to the influence of ambient light in the observation environment. For this reason, the white color that the human eye feels is achromatic white is defined as the adaptation point. The method for calculating the adaptation point will be described later.

  Finally, the correction processing unit 202 converts the video signal based on the adaptation point for the achromatic wall and the adaptation point for the color of the peripheral visual field stored in the parameter register 204. The video signal conversion method will be described later.

<How to obtain wall color information>
FIG. 3 is a diagram for explaining a method for acquiring wall color information. Reference numeral 301 denotes a sensor for acquiring illumination information, and reference numeral 302 denotes a sensor for acquiring wall color information. A sensor for acquiring wall color information is installed on the back surface of the display device. Note that the sensor may be installed on the upper surface or side surface of the display device, a surface processed obliquely, or the like as long as the wall color information can be acquired.

  Further, the wall color information may be acquired by a configuration other than the ambient light sensor. For example, it may be determined by an instruction from the user using the operation unit 114. FIG. 4 is a diagram illustrating a method for acquiring wall color information according to a user instruction. The remote controller 401 is provided with operation keys 402 and can control color information displayed on the panel 119. The operation key 402 is not limited to the illustrated cross type, but may be any method such as a button type or a touch wheel type. The display unit 119 displays a hue adjustment bar 403, a saturation adjustment bar 404, and a brightness adjustment bar 405, and a color based on the value of the adjustment bar is displayed in the display area 406. The user uses the operation keys 402 to adjust the adjustment bar so that the color of the display area 406 is close to the color around the display device. Thereby, the color information adjusted by a user's instruction | indication is acquired as wall color information. In addition, the method of acquiring wall color information by the instruction | indication from a user is not limited to this. For example, a method of displaying a plurality of colors on the display unit 119 and having the user select a color closest to the color around the display device may be used.

<Calculation method of white standard>
FIG. 5 is a block diagram showing the configuration of the white reference calculation unit 203.

  The white reference calculation unit 203 includes a luminance / color difference calculation unit 501, a comparison unit 502, a holding circuit 503, and a color difference average calculation unit 504.

  The luminance / color difference calculation unit 501 acquires color information of each pixel from one frame of the image of the video signal, and converts it into luminance / chrominance signal values. Here, although the color information is RGB, it may be a value based on an arbitrary color space such as a Lab value. In that case, it can be converted into RGB values based on a conversion formula defined by the International Telecommunication Union (ITU) or the International Lighting Commission (CIE). Also, conversion from RGB values to luminance color difference signals (YUV values) can be performed using ITU-R B.3. Conversion can be performed based on the 601 standard.

  The comparison unit 502 compares the luminance color difference signal value of each pixel with a reference value to determine whether there is a highlight point. A highlight point is a pixel having a luminance equal to or higher than a certain reference value. Here, the reference value is assumed to be 99 when the maximum luminance is 100, but may be other values. It is assumed that the reference value is stored in the ROM 112 or RAM 113 in advance.

  The holding circuit 503 holds highlight point color difference information. The color difference information is a UV value in the YUV value. Further, the white reference calculation unit 203 generates a V reset signal when all pixels of one frame of the image of the video signal are scanned, and the holding circuit 503 clears the held data when receiving the V reset signal.

  The color difference average calculation unit 504 calculates an average value from the color difference information of all highlight points held in the holding circuit 503 and stores the average value of highlight points in the RAM 112 as a white reference. Note that when a highlight point is not included in the video signal, a predetermined value is used.

  In addition, the calculation method of the white reference is not limited to this. As the simplest method, a predetermined value such as color temperature information of the display device may be used.

<Calculation method of adaptation point>
FIG. 6 is a flowchart for explaining a method for calculating an adaptation point in the adaptation calculation unit 205.

  In step S <b> 601, the adaptation calculation unit 205 acquires illumination information and wall color information stored in the RAM 113.

  In step S <b> 602, the adaptation calculation unit 205 acquires a white reference stored in the RAM 113.

  In step S603, the adaptation calculation unit 205 calculates an adaptation point for the achromatic wall based on the acquired illumination information and the white reference. A method for calculating the adaptation point for the achromatic wall will be described later.

  In step S604, the adaptation calculation unit 205 calculates an adaptation point for the color of the peripheral visual field based on the acquired wall color information and the white reference. A method for calculating the adaptation point for the color of the peripheral visual field will be described later.

  In step S605, the adaptation calculation unit 205 stores the calculated adaptation point for the achromatic wall and the adaptation point for the color of the peripheral visual field in the parameter register 204.

<Calculation method of adaptation points for achromatic walls>
FIG. 7 is a flowchart for explaining a method of calculating an adaptation point for an achromatic wall. FIG. 8 is a diagram for explaining a method for calculating the adaptation point, which will be described below with reference to this.

  In step S701, the adaptation calculation unit 205 acquires the illumination information acquired in step S601 and the white reference calculated in step S602. FIG. 8 is a u′v ′ plan view, in which 801 is a chromaticity point of illumination information, and 802 is a white reference chromaticity point.

  In step S <b> 702, the adaptation calculation unit 205 calculates an intersection point where a perpendicular is drawn on the black body radiation locus from the chromaticity point of the illumination information. In FIG. 8, 803 is a black body radiation locus, and 804 is an intersection. The black body radiation locus is a locus of light energy emitted by an ideal black body that absorbs all reflected light.

  In step S703, the adaptation calculation unit 205 calculates an adaptation ratio from the illuminance of the illumination information and the luminance of the white reference. Assuming that the illuminance of the illumination information is Ls [lx] and the white reference luminance is Ys [cd / m2], the adaptation ratio Rw can be expressed by the following equation (1).

Rw = Ys / (Ys + Ls / π) (1)
In step S704, the adaptation calculation unit 205 calculates an adaptation point based on the adaptation ratio from the intersection point and the chromaticity point of the white reference. In FIG. 8, 805 is the calculated adaptation point. The adaptation point 805 is a point that internally divides the intersection point 804 and the white reference 802 based on the adaptation ratio Rw.

  Note that the method of calculating the adaptation point for the achromatic wall is not limited to this. As the simplest method, the midpoint of the chromaticity point of the illumination information and the white reference chromaticity point may be calculated as the adaptation point.

<Calculation method of adaptation point for peripheral vision color>
FIG. 9 is a flowchart for explaining a method of calculating an adaptation point for the color of the peripheral visual field. FIG. 10 is a diagram for explaining a method for calculating the adaptation point, which will be described below with reference to this.

  In step S901, the adaptation calculation unit 205 acquires the illumination information and wall color information acquired in step S601, and the white reference calculated in step S602. FIG. 10 is a u′v ′ plan view, in which 1001 is a chromaticity point of illumination information, 1002 is a chromaticity point of wall color information, and 1003 is a chromaticity point of white reference.

  In step S <b> 902, the adaptation calculation unit 205 calculates an intersection point where a perpendicular line is dropped on the black body radiation locus from the chromaticity point of the wall color information. In FIG. 10, 1004 is a black body radiation locus, and 1005 is an intersection.

  In step S903, the adaptation calculation unit 205 calculates a reference ratio from the illuminance of the illumination information and the luminance of the wall color information. Assuming that the illuminance of the illumination information is Ls [lx] and the wall color reference luminance Ya [cd / m2], the reference ratio Ra can be expressed by the following equation (2).

Ra = Ya / (Ya + Ls / π) (2)
In step S904, the adaptation calculation unit 205 calculates an adaptation reference point based on the reference ratio from the intersection and the chromaticity point of the wall color information. In FIG. 10, reference numeral 1006 denotes an adaptation reference point. The adaptation reference point 1006 is a point that internally divides the intersection 1004 and the wall color information 1002 based on the reference ratio Ra.

  In step S905, the adaptation calculation unit 205 calculates an adaptation ratio from the illuminance of the illumination information and the white reference luminance. Assuming that the illuminance of the illumination information is Ls [lx] and the white reference luminance is Ys [cd / m2], the adaptation ratio Rw can be expressed by the following equation (3).

Rw = Ys / (Ys + Ls / π) (3)
In step S906, the adaptation calculation unit 205 calculates an adaptation point based on the adaptation ratio from the chromaticity point of the adaptation reference point and the white reference. In FIG. 10, 1007 is the calculated adaptation point. The adaptation point 1007 is a point that internally divides the adaptation reference point 1006 and the white reference 1003 based on the adaptation ratio Rw.

  Note that the method of calculating the adaptation point for the color of the peripheral visual field is not limited to this. As the simplest method, a table indicating the relationship of the correction amount of the adaptation point to the chromaticity point of the wall color information may be stored in advance, and the adaptation point may be determined based on the wall color information.

<Video signal conversion method>
In the correction processing unit 202, the following processing is executed.

  First, the color information of each pixel is acquired from one image frame of the video signal, and the color information is converted into XYZ stimulus values. The conversion from color information of RGB values to XYZ stimulus values is performed by ITU-R B.3. Conversion can be performed based on the 709 standard.

  Next, the XYZ values are converted into values in the perceptual color space based on the adaptation points for the achromatic wall held in the parameter register 204. The conversion to the value of the perceptual color space can be calculated using a conversion formula such as CIECAM97s or CIECAM02 recommended by the International Commission on Illumination (CIE). Here, based on CIECAM02, the XYZ value is converted into a perceptual color space value (JCH value). In CIECAM02, the luminance La of the adaptive visual field, the relative luminance Yb of the background, and the tristimulus values Xw, Yw, and Zw of the adaptive white are set as parameters. Further, as parameters for determining these influences, a peripheral influence coefficient c, a color induction coefficient Nc, a brightness contrast coefficient Fl, and an adaptation degree coefficient F are set. These parameters are expressed by, for example, the following equations, assuming that the illuminance of the illumination information is Ls [lx], the white reference luminance is Ys [cd / m2], and the chromaticity points of the adaptation points for the achromatic wall are um ′ and vm ′. (4).

La = Ls / π
Yb = 20
Xw = 9/4 × Ys × um ′ / vm ′
Yw = Ys
Zw = Ys / 4 / vm ′ × (3-3 / 4 × um′−5 × vm ′) (4)
The adaptive white tristimulus values Xw, Yw, and Zw are values calculated so that the chromaticity points become um ′ and vm ′ using the conversion formula of CIE1976UCS chromaticity coordinates.

  Further, the parameter value of CIECAM02 is not limited to this, and a parameter determined in advance by a subject experiment or the like may be held and set according to the adaptation point.

  Next, the perceptual color space value is converted into an XYZ stimulus value based on the adaptation point for the color of the peripheral visual field held in the parameter register 204. Assuming that the illuminance of the illumination information is Ls [lx], the white reference luminance is Ys [cd / m2], and the chromaticity points of the adaptation points with respect to the color of the peripheral visual field are un ′ and vn ′, for example, be able to.

La = Ls / π
Yb = 20
Xw = 9/4 × Ys × un ′ / vn ′
Yw = Ys
Zw = Ys / 4 / vn ′ × (3-3 / 4 × un′−5 × vn ′) (5)
The adaptive white tristimulus values Xw, Yw, and Zw are values calculated using the CIE 1976 UCS chromaticity coordinate conversion formula so that the chromaticity points are un ′ and vn ′.

  Finally, XYZ stimulus values are converted to RGB values. The conversion from the XYZ stimulus value to the RGB value is performed by ITU-R B.3. Conversion can be performed based on the 709 standard.

  By performing the processing described above, it is possible to perform correction processing according to the color of the peripheral visual field, suppress the contrast effect due to the color of the peripheral visual field, and provide a suitable display.

<Embodiment 2>
In the first embodiment, the method for calculating the adaptation point based on the color of the peripheral visual field has been described. However, the degree of influence that the color of the peripheral visual field has on the vision may differ depending on the angle of view required from the distance of the viewer and the screen size. In the present embodiment, a method for calculating an adaptation point based on the color and angle of view of the peripheral visual field will be described.

  FIG. 11 is a block diagram showing the configuration of the image processing apparatus of this embodiment. In addition, description is abbreviate | omitted regarding the site | part same as Embodiment 1. FIG.

  The angle-of-view information acquisition unit 1101 calculates the angle-of-view information based on the viewer's distance and the screen size. The viewer's distance can be obtained, for example, by measuring the time when the light emitted from the remote control 118 is reflected and returned. Further, it may be determined by an instruction from the user using the operation unit 114. A predetermined value is used as the screen size, but in the case of a display device such as a projector that has a variable screen size, it can be calculated from a distance meter mounted on the display device. When the viewer's distance is d [m] and the screen size is H [inch], the angle of view θ [deg] can be expressed by the following equation (6).

tan (θ / 2) = H / 2 / d (6)
Next, a method in which the adaptation calculation unit 1105 calculates an adaptation point based on the peripheral visual field color and the angle of view will be described.

  FIG. 12 is a flowchart for explaining a method of calculating an adaptation point for the color of the peripheral visual field.

  In step S1201, the adaptation calculation unit 1105 acquires illumination information, wall color information, white reference, and field angle information.

  In step S <b> 1202, the adaptation calculation unit 1105 calculates the intersection obtained by dropping a perpendicular line from the chromaticity point of the wall color information onto the black body radiation locus, as in the first embodiment.

  In step S1203, the adaptation calculation unit 1105 calculates a reference ratio from the illuminance of the illumination information, the luminance of the wall color information, and the angle of view information. If the illuminance of the illumination information is Ls [lx], the wall color reference luminance Ya [cd / m2], and the angle of view is θ [deg], the reference ratio Ra can be expressed by the following equation (7).

Ra = Ya × θ × Wg / (Ya × θ × Wg + Ls / π) (7)
Here, Wg is a weighting coefficient for the angle of view. For example, the weighting factor Wg may be determined by the following equation (8) based on the angle of view θa at which the viewer's distance is 3H.

Wg = 1 / θa (8)
Note that the calculation method of the reference ratio Ra is not limited to this, and parameters determined in advance by subject test or the like may be held and set according to illumination information, wall color information, and angle of view.
In step S1204, the adaptation calculation unit 1105 calculates the adaptation reference point based on the reference ratio from the intersection point and the chromaticity point of the wall color information, as in the first embodiment.

  In step S1205, the adaptation calculation unit 1105 calculates the adaptation ratio from the illuminance of the illumination information and the luminance of the white reference, as in the first embodiment.

  In step S1206, the adaptation calculation unit 1105 calculates an adaptation point based on the adaptation ratio from the chromaticity point of the adaptation reference point and the white reference, as in the first embodiment.

  By performing the processing described above, correction processing according to the color and angle of view of the peripheral visual field becomes possible, and a suitable display can be provided in consideration of the degree of influence of the contrast effect due to the color of the peripheral visual field.

<Other embodiments>
Note that the present invention can be applied to a system (for example, a copier, a facsimile machine, etc.) consisting of a single device even if it is applied to a system composed of a plurality of devices (for example, a host computer, interface device, reader, printer, etc.). You may apply.

  The object of the present invention can also be achieved by supplying, to a system, a storage medium that records the code of a computer program that realizes the functions described above, and the system reads and executes the code of the computer program. In this case, the computer program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the computer program code constitutes the present invention. In addition, the operating system (OS) running on the computer performs part or all of the actual processing based on the code instruction of the program, and the above-described functions are realized by the processing. .

  Furthermore, you may implement | achieve with the following forms. That is, the computer program code read from the storage medium is written into a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer. Then, based on the instruction of the code of the computer program, the above-described functions are realized by the CPU or the like provided in the function expansion card or function expansion unit performing part or all of the actual processing.

  When the present invention is applied to the above storage medium, the computer program code corresponding to the flowchart described above is stored in the storage medium.

Claims (10)

An image display device comprising a display unit,
Obtaining means for obtaining wall color information around the image display device;
An input means for inputting a video signal;
Color difference acquisition means for acquiring, as color difference information, an average value of UV values among YUV values that are luminance color difference values of pixels whose luminance Y is greater than or equal to a threshold value among pixels of a video frame based on the video signal input by the input means. ,
Correction means for correcting the input video signal using wall color information acquired by the acquisition means and color difference information acquired by the color difference acquisition means, and based on the corrected video signal The color perceived from the video displayed on the display unit is less in the wall color around the image display device than the color perceived from the video displayed on the display unit based on the uncorrected video signal. In the case of chromatic color, the second color difference information becomes closer to the color perceived from the video displayed based on the video signal not corrected, and the color difference acquisition means has the second color difference information whose red component is stronger than the first color difference information. When the color difference acquisition unit acquires the wall color information and the color difference information so that red color is more easily perceived from the video displayed on the display unit than when the color difference acquisition unit acquires the first color difference information. Use And correcting means for correcting the video signal,
An image display apparatus comprising: an output unit that outputs the video signal corrected by the correction unit to the display unit. In addition to the wall color information , the acquisition means acquires illumination information related to the color of illumination around the image display device,
In the correcting means, a color perceived from the video displayed on the display unit based on the corrected video signal is perceived from the video displayed on the display unit based on the uncorrected video signal. It is perceived from the video displayed based on the video signal not subjected to the correction when the wall color around the image display device is achromatic and the illumination around the image display device is achromatic rather than the color. The image display apparatus according to claim 1 , wherein the video signal is corrected based on the wall color information, the color difference information, and the illumination information so as to be close to a certain color. The acquisition unit, an image display apparatus according to claim 1 or 2, characterized in that to obtain the wall color information from a sensor attached to the back surface of the display unit. A signal input unit for inputting a signal from a remote controller having an operation key for a user to select a wall color, and the acquisition unit acquires the signal input by the signal input unit as the wall color information; the image display apparatus according to claim 1 or 2, characterized. The acquisition unit, an image display apparatus according to claim 1 or 2, characterized in that to obtain the information corresponding to the color specified by the user from a plurality of colors displayed on the display unit as the wall color information . An image display method performed by an image display device including a display unit,
An acquisition step of acquiring wall color information around the image display device;
An input process for inputting a video signal;
A color difference acquisition step of acquiring, as color difference information, an average value of UV values among YUV values of luminance color difference values of pixels having a luminance Y equal to or higher than a threshold among pixels of a video frame based on the video signal input in the input step; ,
A correction step of correcting the input video signal using the wall color information acquired by the acquisition step and the color difference information acquired by the color difference acquisition step , based on the corrected video signal When the color perceived from the video displayed on the display unit is an achromatic color of the surrounding wall, rather than the color perceived from the video displayed on the display unit based on the video signal without correction When the color difference acquisition step acquires second color difference information having a red component stronger than that of the first color difference information. The wall color information and the color difference information are used so that red is more easily perceived from the video displayed on the display unit than when the color difference acquisition step acquires the first color difference information. Video And a correction step of correcting the issue,
An image display method comprising: an output step of outputting the video signal corrected by the correction step to the display unit. In the acquisition step, in addition to the wall color information, the illumination information related to the color of illumination around the image display device is acquired,
In the correction step, the color perceived from the video displayed on the display unit based on the corrected video signal is perceived from the video displayed on the display unit based on the video signal not corrected. It is perceived from the video displayed based on the video signal not subjected to the correction when the wall color around the image display device is achromatic and the illumination around the image display device is achromatic rather than the color. The image display method according to claim 6 , wherein the video signal is corrected based on the wall color information, the color difference information, and the illumination information so as to be close to a certain color. The image display method according to claim 6 or 7 , wherein the acquiring step acquires the wall color information from a sensor installed on a back surface of the display unit. A signal input step for inputting a signal from a remote controller having an operation key for a user to select a wall color;
The image display method according to claim 6 or 7 , wherein the acquisition step acquires the signal input in the signal input step as the wall color information. The image display method according to claim 6 or 7 , wherein the acquiring step acquires information corresponding to a color designated by a user from the plurality of colors displayed on the display unit as the wall color information. .

Images