JP2019082509A - Image display device and control method for image display device - Google Patents

Abstract

An object of the present invention is to suppress a decrease in luminance and correct non-uniformity with high accuracy according to various setting luminances.
An image display apparatus according to the present invention includes a luminance acquisition unit that acquires a first luminance, and a light source unit that can adjust light emission luminance, and emits light based on the first luminance. Parameter generation means for generating a non-uniformity correction parameter for reducing the correction amount of at least one of non-uniformity of luminance and / or non-uniformity as the first luminance is higher, and correcting input image data based on the non-uniformity correction parameter It has an unevenness correction means, and a display means for displaying an image by transmitting light emitted by the light emitting means with a transmittance based on the image data after the correction.
[Selected figure] Figure 1

Description

  The present invention relates to an image display device and a control method of the image display device.

  In an image display device using a liquid crystal panel or a backlight, various techniques have been proposed as a method of correcting unevenness generated on a display screen. Patent Document 1 discloses a technique for correcting unevenness in luminance by reducing a portion having high luminance to have the same luminance as a portion having low luminance. However, when the above-described correction method is used for an image display apparatus that requires high luminance such as HDR display, the effect of HDR display can not be obtained. Here, HDR (High Dynamic Range) is a technology for extending the dynamic range by performing high-intensity lighting of the light source.

  On the other hand, there has been proposed a technique of adjusting the correction amount of the uneven brightness and uneven color according to the pixel value of the image data. Patent Document 2 discloses a technique for correcting unevenness in luminance and unevenness in color without reducing the luminance level by suppressing the amount of correction as the intensity of each color component of the image data increases.

JP 2007-114427 A JP, 2008-310261, A

However, since the brightness of the backlight is not considered in the unevenness correction method of Patent Document 2, for example, even when the backlight is lit at low brightness such as 100 cd / m ² , unevenness correction of the high gradation portion of the image data is performed. It will be suppressed. Therefore, there is a problem that the accuracy of unevenness correction at the time of low brightness lighting is lowered. In general, when the backlight performs high brightness lighting such as 1000 cd / m ² , the high gradation part in the image data is often an image such as light reflection, and the brightness is more than the color uniformity. It is regarded as important. On the other hand, when performing low luminance display such as 100 cd / m ^2, the high gradation part in the image data is often an image that affects the entire display image, and high luminance display is performed for luminance and color uniformity. It is considered more important than the case.

  Therefore, the present invention has an object to provide a technique for suppressing a decrease in luminance and correcting unevenness with high accuracy according to various set luminances.

The first aspect of the present invention is
Luminance acquisition means for acquiring the first luminance;
A light emitting unit having a light source unit capable of adjusting light emission luminance, and emitting light based on the first luminance;
Parameter generation means for generating a non-uniformity correction parameter for reducing the correction amount of at least one of non-uniformity in luminance and non-uniformity in color as the first luminance is higher;
Unevenness correction means for correcting input image data based on the unevenness correction parameter;
Display means for displaying an image by transmitting light emitted by the light emitting means with a transmittance based on the image data after the correction;
An image display apparatus characterized in that

The second aspect of the present invention is
A light emitting unit having a light source unit capable of adjusting light emission luminance;
Display means for displaying an image by transmitting light emitted by the light emitting means with a transmittance based on image data;
A control method of an image display apparatus comprising:
A luminance acquisition step of acquiring a first luminance;
A parameter generation step of generating a non-uniformity correction parameter that reduces the correction amount of at least one of non-uniformity in luminance and color as the first luminance is higher;
An unevenness correction step of correcting input image data based on the unevenness correction parameter;
Have
The light emitting means emits light based on the first luminance,
The display means transmits light emitted by the light emitting means at a transmittance based on the image data after the correction.
It is a control method of an image display device characterized by things.

  A third aspect of the present invention is a program for causing a computer to execute the steps of the above method.

  According to the present invention, it is possible to suppress the decrease in luminance and correct the unevenness with high accuracy in accordance with various set luminances.

Functional block diagram showing an example of the image display device according to the first embodiment A figure showing an example of a luminosity setting screen concerning Embodiment 1 FIG. 6 is a diagram showing an example of a parameter generation unit according to the first embodiment. The figure which shows an example of the reference parameter which concerns on Embodiment 1. FIG. 6 is a diagram showing an example of reference parameters at predetermined gradation values according to the first embodiment. FIG. 6 is a diagram showing an example of unevenness correction coefficient according to the first embodiment. FIG. 6 is a diagram showing an example of unevenness correction parameters according to the first embodiment. Flow chart of unevenness correction processing according to the first embodiment A figure showing an example of a picture setting menu concerning modification 1 of embodiment 1. Functional block diagram showing an example of an image display device according to the second embodiment The figure which shows an example of the nonuniformity correction parameter which concerns on Embodiment 2. Flow chart of unevenness correction process according to the second embodiment

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described.

<Overall configuration>
FIG. 1 is a functional block diagram showing an example of an image display apparatus 100 according to the present embodiment. An image display apparatus 100 according to the present embodiment includes a light emitting unit 101, a display unit 102, a luminance acquiring unit 103, a parameter generating unit 104, an unevenness correcting unit 105, and the like.

The light emitting unit 101 (light emitting unit) is a backlight device that emits light to the back surface of the display unit 102 described later. The light emitting unit 101 has one or more light sources (a light source unit or a light source group), and light emitted from the light sources is diffused in the surface direction by a diffusion plate (not shown) and is a backlight having a predetermined spread. The display unit 102 is illuminated from behind. In addition, although the light emitting element of a light source can use LED (light emitting diode) etc., the light emitting element of a light source is not limited to LED. For example, a laser element, an organic EL element, a cold cathode tube element, a plasma element or the like may be used as the light emitting element. The color of the light emitted from the light source may be white, red, green or blue light, ultraviolet light or the like. Further, one light source may have a plurality of light emitting elements.

  The light emitting unit 101 is also capable of adjusting the light emission luminance of the light source, and drives the light source based on the luminance acquired by the luminance acquiring unit 103 described later. Here, the signal controlled by the light emitting unit 101 represents, for example, the pulse width of a pulse signal (a pulse signal of current or voltage) applied to the light source. In that case, the light emission luminance of the light source is adjusted (PWM control) by the light emitting unit 101 adjusting the control signal. The control signal may be a signal representing the peak value of the pulse signal applied to the light source (PAM control), or may be a signal representing both the pulse width and the peak value (PWAM control).

  The display unit 102 (display unit) is a functional unit that performs display according to image data (after correction described later) by modulating light emitted from the light emitting unit 101 with a liquid crystal panel. In addition, the image display apparatus 100 which concerns on this embodiment can also use display elements (MEMS shutter etc.) other than a liquid crystal display element.

  In the display unit 102, liquid crystal shutter elements (not shown), color filters and the like are arranged in a matrix. The liquid crystal shutter element forms an image on the panel by changing the transmittance of the corresponding element according to the RGB value of each pixel of the image data. In the liquid crystal shutter element, a plurality of pixels are arranged horizontally and vertically. In each pixel, R, G, and B pixels are provided as sub-pixels (sub-pixels). The color filter is a member that separates the light emitted from the light emitting unit 101 into three wavelength bands of R, G, and B, respectively.

  The luminance acquisition unit 103 superimposes and displays the luminance setting screen (user interface) on the display image in response to a luminance setting request from the user, and the setting luminance (the first setting) is the luminance set according to the user's luminance setting operation. Brightness) is set. The luminance acquisition unit 103 outputs the set luminance to the light emission unit 101 and a parameter generation unit 104 described later.

FIG. 2 shows an example of a luminance setting screen according to the present embodiment. In the present embodiment, an example in which a predetermined luminance is selected in the range of 0 to 1000 cd / m ² will be described. In the following description, the case where the setting luminance is set to 100 cd / m ² is referred to as SDR (Standard Dynamic Range) display, and the case where it is set to 1000 cd / m ² is referred to as HDR display. Note that the unit and range of luminance set by the luminance acquisition unit 103 are not limited to 0 to 1000 cd / m ² , and higher luminance may be set. Also, the interval of the set luminance is not particularly limited. For example, the setting may be made in units of 1 cd / m ² . In addition, the setting brightness may be set according to a request other than the user's request. For example, the luminance may be automatically adjusted in accordance with the brightness of the surrounding environment, or may be set automatically when a setting button or the like is provided and the button is pressed.

  The parameter generation unit 104 is a functional unit that generates unevenness correction parameters based on the brightness set by the brightness acquisition unit 103. In the present embodiment, the parameter generation unit 104 generates the unevenness correction parameter using the reference parameter for holding the unevenness correction amount for each area in the plane of the display unit 102 and the correction coefficient for adjusting the correction amount.

Here, the reference parameter holds a correction value obtained by measuring or theoretically calculating in advance for each predetermined region in the plane of the display unit 102. Thus, when the luminance value of a specific screen area (for example, near the center of the screen) is higher than that of the other areas, the parameter generation unit 104 lowers the luminance of the specific screen area based on the correction value. Uneven luminance occurring in the display unit 102 can be corrected uniformly.

  However, when such nonuniformity correction is performed, the luminance decreases, and therefore, when performing HDR display, the effect of high luminance lighting can not be obtained. Therefore, in the present embodiment, the parameter generation unit 104 adjusts the correction coefficient so that the unevenness correction amount (correction value of the reference parameter) decreases as the luminance set by the luminance acquisition unit 103 is higher (HDR display). Set up. Thereby, the parameter generation unit 104 can suppress the decrease in luminance by suppressing the unevenness correction when the set luminance is high as in the HDR display. The parameter generation unit 104 can perform nonuniformity correction with high accuracy when the set brightness is low as in the SDR display. Hereinafter, details of the parameter generation unit 104 will be described using FIG.

  FIG. 3 shows a functional block diagram of the parameter generation unit 104. The parameter generation unit 104 includes a storage unit 1041, a coefficient calculation unit 1042, a multiplication unit 1043, and the like. In this embodiment, the unevenness correction parameter is generated by multiplying the unevenness correction reference parameter stored in advance in the storage unit 1041 by the unevenness correction coefficient calculated by the coefficient calculation unit 1042.

  The storage unit 1041 holds one or more reference parameters. FIG. 4 illustrates an example of reference parameters stored in the storage unit 1041. In the present embodiment, five types of reference parameters corresponding to the gradation values 0, 256, 512, 768, and 1023 of the input image data are stored in the storage unit 1041. In addition, each reference parameter has a value (correction value) for each of 5 vertical 5 horizontal regions in the surface direction. In addition, in the case other than the above-mentioned gradation value, a reference parameter may be newly provided and a reference parameter may be provided by interpolating from the existing reference parameter. Further, the number of areas of the reference parameter is not limited to 5 × 5.

  FIG. 5 shows an example of reference parameters corresponding to the tone value 1023. In the present embodiment, a correction value (setting value) at the time of lowering the pixel value of the image data by correction is stored in the value of the reference parameter. Specifically, when the pixel value of the image data in the central portion of the display unit 102 is lowered by 100 by correction, “−100” is set as the corresponding value of the reference parameter. In addition, the value set to a reference parameter is not limited to the above-mentioned correction value. For example, the value set as the reference parameter may be a ratio at which the luminance value for each area decreases.

ここで、ｋはムラ補正係数、ｐは設定輝度を示す。例えば、設定輝度が４５０ｃｄ／ｍ^２の場合、ムラ補正係数は０．５である。なお、設定輝度とムラ補正係数の対応関係は図６および式（１）に示す例に限定されない。 The coefficient calculation unit 1042 is a functional unit that calculates the unevenness correction coefficient according to the brightness set by the brightness acquisition unit 103. Specifically, the coefficient calculation unit 1042 calculates a coefficient such that the unevenness correction coefficient decreases as the set brightness increases. FIG. 6 shows an example of the relationship between the set luminance and the unevenness correction coefficient. In the present embodiment, the unevenness correction coefficient is 1.0 if the set luminance is equal to or less than the first threshold s ₁ (eg, 300 cd / m ² ), and is equal to or greater than the second threshold s ₂ (eg, 600 cd / m ² ) If it is 0.0, it will change linearly if it is between threshold value s ₁ and threshold value s ₂ . The following equation (1) shows an example of the relationship between the set luminance and the correction coefficient when the threshold values s ₁ and s ₂ or more are 300 and 600 cd / m ² , respectively.

Here, k indicates the unevenness correction coefficient, and p indicates the set brightness. For example, when the set luminance is 450 cd / m ² , the unevenness correction coefficient is 0.5. The correspondence between the set brightness and the unevenness correction coefficient is not limited to the example shown in FIG. 6 and the equation (1).

The multiplying unit 1043 is a functional unit that generates the unevenness correction parameter based on the reference parameter and the unevenness correction coefficient. First, the multiplying unit 1043 acquires, from the storage unit 1041, reference parameters corresponding to the gradation value of the input image data. Then, the multiplying unit 1043 generates the unevenness correction parameter by multiplying each reference parameter by the above-mentioned unevenness correction coefficient. As a result, when the set brightness is high (about 600 cd / m ² or more in the example of FIG. 6), the unevenness correction parameter is 0, and the unevenness correction parameter is 0. Is suppressed. When the set brightness is low (about 300 cd / m ² or less in the example of FIG. 6), the nonuniformity correction parameter is the same as the reference parameter because the nonuniformity correction coefficient is 1, and the nonuniformity correction unit 105 described later has high accuracy. Unevenness can be corrected.

  The unevenness correction unit 105 is a functional unit that performs unevenness correction on input image data based on the unevenness correction parameter, and generates image data to be output to the display unit 102. Specifically, the unevenness correction unit 105 corrects the unevenness in brightness by reducing the pixel value of the corresponding image data according to the value of the unevenness correction parameter. Hereinafter, details of the unevenness correction unit 105 will be described with reference to FIG.

FIG. 7 shows an example of the unevenness correction parameter in the case where the set luminance is 100 cd / m ² (SDR display) and in the case where the set luminance is 1000 cd / m ² (HDR display). As shown in FIG. 7, since the unevenness correction coefficient is 1.0 as described above when the set luminance is 100 cd / m ² , the unevenness correction parameter is the same as the reference parameter, and the unevenness of the display unit 102 is uniformly corrected. Be done. On the other hand, since the unevenness correction coefficient when the set luminance is 1000 cd / m ² is 0.0, the values of the unevenness correction parameters are all 0. As described above, the unevenness correction unit 105 can suppress the decrease in luminance when the HDR image is displayed by not performing the unevenness correction process in the high gradation portion.

<Processing content>
Next, the operation of the non-uniformity correction process according to the present embodiment will be described using the flowchart of FIG. First, the luminance acquisition unit 103 acquires the luminance (set luminance) set by the user (S102). Then, the coefficient calculation unit 1042 calculates the unevenness correction coefficient based on the set brightness (S104). Next, the multiplication unit 1043 (parameter generation unit 104) calculates the unevenness correction parameter based on the unevenness correction coefficient and the reference parameter of the storage unit 1041 (S106). Then, the unevenness correction unit 105 corrects the input image data based on the unevenness correction parameter (S108).

In the present embodiment, an example in which the unevenness correction coefficient is determined according to the set brightness has been described, but the parameter generation unit 104 may change the unevenness correction coefficient for each reference parameter. Thus, the unevenness correction unit 105 can perform the unevenness correction process in more detail. Further, in the present embodiment, the case where the set luminance is 100 cd / m ² or 1000 cd / m ² has been described as an example, but luminances other than these can be set, and processing can be performed in the same manner. For example, when the set luminance is 450 cd / m ² , the correction coefficient is 0.5 according to equation (1), so the parameter generation unit 104 (multiplication unit 1043) multiplies 0.5 for each reference parameter to correct unevenness. Generate parameters.

<Effect of this embodiment>
As described above, the image display apparatus according to the present embodiment suppresses the decrease in luminance during high luminance display (for example, HDR display) by controlling the correction amount of unevenness to be smaller as the setting luminance is higher. In low luminance display (for example, SDR display), unevenness can be corrected with high accuracy.

(Modification 1 of Embodiment 1)
In the above embodiment, an example in which the luminance value is set by the user has been described, but in this embodiment, an example using a setting menu (user interface) as illustrated in FIG. 9 will be described.

  FIG. 9 shows a video setting menu according to the present embodiment. The image setting menu is provided with a plurality of image modes. As the video mode, for example, a first video mode (BT. 709) in which luminance, color gamut, and gamma value are set for displaying an SDR image can be used. Further, as another video mode, it is possible to use a second video mode (HLG: Hybrid Log-Gamma) in which a luminance, a color gamut, and a gamma value are set for displaying an HDR image. In this case, the coefficient calculation unit 1042 sets the unevenness correction coefficient based on the selected video mode. For example, the luminance acquisition unit 103 sets the unevenness correction coefficient to 1 when the first video mode is selected by the user, and sets the unevenness correction coefficient to 0 when the second video mode is selected. Set Thereby, when the first video mode is selected, unevenness is corrected with high accuracy, and when the second video mode is selected, the decrease in luminance due to the unevenness correction is suppressed. Note that three or more video modes may be provided. Further, the selection method of each mode and the layout of the display image are not limited to the menu screen shown in FIG.

(Modification 2 of Embodiment 1)
Although the above-mentioned embodiment demonstrated the example which the image display apparatus 100 correct | amends a brightness nonuniformity, it is applicable also in the case where a color nonuniformity and both a brightness nonuniformity and a color nonuniformity are corrected. For example, when performing color unevenness correction, reference parameters are provided in the storage unit 1041 for each of R, G, and B, and the unevenness correction unit 105 corrects pixel values of image data for each of R, G, and B. Can. In the case of correcting both the uneven brightness and the uneven color, processing may be performed so as to suppress the correction effect of only the uneven brightness when the high brightness is set, and the same correction may be performed regardless of the set brightness. As a result, it is possible to correct color unevenness while suppressing a decrease in luminance.

(Modification 3 of Embodiment 1)
In the above-described embodiment, an example has been described in which the multiplication unit 1043 multiplies the correction coefficient by all the reference parameters corresponding to the gradation value of the input image data. , And may be multiplied by a correction coefficient. As a specific example, among the reference parameters shown in FIG. 4, only the gradation values 768 and 1023 are multiplied by the above-mentioned correction coefficient, and the other reference parameters are not multiplied by the above-mentioned correction coefficient. By doing this, the unevenness correction unit 105 does not perform unevenness correction on image data with a high gradation value, with emphasis on brightness as in the above embodiment, at the time of high brightness lighting, and gradation is not performed. Unevenness correction can be performed on image data with a low value by emphasizing color uniformity.

Second Embodiment
In addition to the processing of the first embodiment, the image display apparatus 200 according to the present embodiment controls the light emission luminance of the light source so as to compensate for the luminance change (luminance reduction) caused by the unevenness correction. Thus, the image display apparatus 200 can suppress the reduction in display luminance even when the correction amount of unevenness is changed according to the set luminance. The second embodiment of the present invention will be described below.

  FIG. 10 is a functional block diagram of an image display apparatus 200 according to the present embodiment. An image display apparatus 200 according to the present embodiment includes a luminance control unit 206 in addition to the configuration of the first embodiment.

The brightness control unit 206 is a functional unit that controls the light emission brightness of the light source. Specifically, the brightness control unit 206 is based on the brightness (hereinafter referred to as the first brightness) set by the brightness acquisition unit 103 and the unevenness correction parameter generated by the parameter generation unit 104. The second luminance, which is the light emission luminance that compensates for the reduction in luminance due to the unevenness correction, is determined. Then, the brightness control unit 206 controls the light emission brightness of the light emitting unit 101 so that the light source is turned on at the second brightness after control.
Hereinafter, details of the luminance control unit 206 will be described.

ここで、γは表示部１０２のガンマ設定値を示す。例えば、参照値Ｔ_ｄが−１００、ガンマ設定値γが２．２の場合、輝度低下率Ｌ_ｄは約０．２である。つまり、中央部の輝度が約２０％低下することを意味する。 First, the luminance control unit 206 calculates the luminance reduction rate L _d (luminance reduction amount) from the reference value T _d based on the reference parameter corresponding to the gradation value of the image data. In the present embodiment, the brightness control unit 206 uses the value of the central part of the reference parameter in FIG. 11 as a reference value _Td . The reason why the central part value is used as the reference value _Td is that in many cases the luminance reduction due to the correction amount is large compared to the peripheral part in the central part of the display screen, and the influence due to the luminance reduction is clearly recognized It is for. The reference value _Td is not limited to the value of the central part of the reference parameter. For example, the reference value _Td may be a value other than the central part of the reference parameter. For example, the reference value _Td may be the maximum value (-105 in the example of FIG. 11) of the correction amount of the reference parameter, or may be an average value of a plurality of values. In the present embodiment, the brightness control unit 206 calculates a luminance reduction rate L _d using the following equation (1).

Here, γ indicates the gamma setting value of the display unit 102. For example, the reference value _{T d} is -100, if the gamma setting value γ is 2.2, luminance reduction rate _{L d} is about 0.2. In other words, this means that the brightness at the central portion is reduced by about 20%.

例えば、輝度低下率Ｌ_ｄが０．２の場合は、式（２）より、第２の輝度Ｌ_２は、第１の輝度Ｌ_１の１．２５倍の輝度となる。 Then, the brightness control unit 206, based on the brightness reduction rate L _d of the above, obtaining the second luminance L ₂ is a light-emitting luminance such as to compensate for the luminance decrement _{(L 2} ≧ L _1). Then, the brightness control unit 206 controls the light emission luminance of the light source to emit light at a second luminance L _2. Here, the second luminance L ₂ is, if a value exceeding the upper limit of the settable brightness, the brightness control unit 206 may be the upper limit of the luminance second luminance L _2. In the present embodiment, the luminance control unit 206 calculates the _second luminance L2 using the following equation (2).

For example, in the case of the luminance reduction rate _{L d} is 0.2, the equation (2), second luminance _{L 2} is a first 1.25 times the luminance of the luminance _{L 1.}

<Processing content>
Next, processing according to the present embodiment will be described using the flowchart of FIG. First, the luminance acquisition unit 103 acquires the luminance (first luminance) set by the user (S102). Then, the coefficient calculation unit 1042 calculates the unevenness correction coefficient based on the set brightness (S104). Next, the multiplication unit 1043 (parameter generation unit 104) calculates the unevenness correction parameter based on the unevenness correction coefficient and the reference parameter of the storage unit 1041 (S106). Then, the unevenness correction unit 105 corrects the input image data based on the unevenness correction parameter (S108). Here, the luminance control unit 206 controls light emission luminance in order to compensate for the reduction in luminance due to the above-described unevenness correction (S210). Specifically, the brightness control unit 206, the first luminance L ₁ and non-uniformity correction parameters, the second seek luminance L ₂ of using the above equation (2) and (3), second luminance L _The light emission luminance of the light source is controlled to emit light at ₂ .

  By the process described above, the luminance control unit 206 can perform nonuniformity correction with high accuracy and compensate for the reduction in luminance caused by the nonuniformity correction.

(Other embodiments)
In the above embodiment, although the method of controlling the nonuniformity correction amount using the nonuniformity correction parameter obtained from the nonuniformity correction coefficient has been described, the nonuniformity correction parameter may be provided for each set luminance. The present invention can also be applied to an image display apparatus configured with a liquid crystal panel (double liquid crystal) having a double structure and a backlight, an image projection apparatus such as a projector, and the like.

  The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or storage medium, and one or more processors in a computer of the system or apparatus read and execute the program. Can also be realized. It can also be implemented by a circuit (eg, an ASIC) that implements one or more functions.

  As mentioned above, although the preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

100, 200: image display device 101: light emitting unit 102: display unit 103: luminance acquiring unit 104: parameter generating unit 105: unevenness correcting unit

Claims (9)

Luminance acquisition means for acquiring the first luminance;
A light emitting unit having a light source unit capable of adjusting light emission luminance, and emitting light based on the first luminance;
Parameter generation means for generating a non-uniformity correction parameter for reducing the correction amount of at least one of non-uniformity in luminance and non-uniformity in color as the first luminance is higher;
Unevenness correction means for correcting input image data based on the unevenness correction parameter;
Display means for displaying an image by transmitting light emitted by the light emitting means with a transmittance based on the image data after the correction;
An image display apparatus characterized by having. The parameter generation unit generates a non-uniformity correction parameter that reduces the correction amount as the first luminance is high and the pixel value of the input image data is large.
The image display apparatus according to claim 1, A storage unit that stores a reference parameter that holds a correction amount according to the tone value of the input image data;
Coefficient calculation means for calculating a correction coefficient which is set to a smaller value as the first luminance is higher;
And have
The parameter generation unit generates the unevenness correction parameter by adjusting the correction amount held by the reference parameter with the correction coefficient.
The image display apparatus according to claim 1 or 2, wherein The unevenness correction means corrects the unevenness in brightness by adjusting a pixel value of input image data based on the unevenness correction parameter.
The image display apparatus according to any one of claims 1 to 3, characterized in that: The luminance acquisition unit receives an input from a user using a user interface displayed superimposed on an input image.
The image display device according to any one of claims 1 to 4, characterized in that: The user may select one of the first video mode in which the luminance acquisition means is set to high luminance and the second video mode in which the luminance is set to be lower than the first video mode. Acquire the first luminance by
The image display device according to any one of claims 1 to 5, characterized in that: The apparatus further comprises luminance control means for determining a luminance reduction amount by the correction based on the unevenness correction parameter, and determining a second luminance that is higher than the first luminance based on the luminance reduction amount.
The light emitting means emits light based on the second luminance,
The image display apparatus according to any one of claims 1 to 6, characterized in that: A light emitting unit having a light source unit capable of adjusting light emission luminance;
Display means for displaying an image by transmitting light emitted by the light emitting means with a transmittance based on image data;
A control method of an image display apparatus comprising:
A luminance acquisition step of acquiring a first luminance;
A parameter generation step of generating a non-uniformity correction parameter that reduces the correction amount of at least one of non-uniformity in luminance and color as the first luminance is higher;
An unevenness correction step of correcting input image data based on the unevenness correction parameter;
Have
The light emitting means emits light based on the first luminance,
The display means transmits light emitted by the light emitting means at a transmittance based on the image data after the correction.
And controlling the image display apparatus.   The program for making a computer perform each step of the control method of the image display apparatus of Claim 8.

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