Image display apparatus

An image display device and a technology for displaying brightness, which are applied to identification devices, image communication, static indicators, etc., can solve the problems of reduced brightness difference discrimination ability and indistinguishable grayscale, and achieve the effect of avoiding flattening

Inactive Publication Date: 2012-09-12
CANON KK
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, it was found that in an image display device using the GSDF characteristic of DICOM, compared with the intermediate gray scale range, the luminance difference discrimination ability is lowered with respect to the change of the image signal, so the gradation in the high luminance and gray scale range is in the gray scale is indistinguishable when changed, causing a seemingly flat phenomenon

Method used

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Examples

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Embodiment 1

[0043] Embodiment 1 of the present invention will be described in detail below with reference to the drawings. The present invention is applicable to another embodiment in which part or all of the construction of Embodiment 1 is replaced by its alternative construction, and only when the gray scale is closer to its maximum value, is assigned to the difference of the gray scale, the brightness of the The amount of change in the common logarithm becomes larger.

[0044] In this Embodiment 1, a video display device having only a display function, such as a computer monitor, will be described as an image display device. However, television receivers and electronic viewfinders mounted on cameras and video cameras, which are video display devices including video and audio receiving units, are also called video display devices. The video display device can be used for image display devices such as CRTs, liquid crystal displays, plasma displays, and organic EL displays.

[0045] Reg...

example 1

[0077] figure 1 is a diagram of the configuration of an exemplary video display device. figure 2 is a plot of luminance discriminability threshold contrast characteristics versus incident light luminance. image 3 is a graph of the light intensity characteristics of visual stimuli relative to the JND metric. Figure 4 is a plot of brightness discriminability threshold properties versus stimulus light brightness. Figure 5 is a graph of the emission luminance characteristics with respect to the input signal level. Image 6 It is a quadrant diagram of signal transition from video signal input to light emission.

[0078] Such as figure 1 As shown, in a video display device 101 , a video signal transmitted from a video source (not shown) is captured as a video signal 103 in the video display device 101 through a video signal input terminal 102 . The signal format of video signal 103 may vary depending on the type of video source. In this example, the signal is normalized ...

example 2

[0134] Figure 7 is a graph of brightness discriminability threshold contrast characteristics with respect to incident light brightness in Example 2. Figure 8 is a graph of the brightness characteristics of visual stimuli relative to the JND index in Example 2. Figure 9 is a graph of the emission luminance characteristics with respect to the input signal level in Example 2.

[0135] Example 2 is constructed and controlled in the same manner as Example 1, except that the characteristic of the grayscale-display brightness conversion LUT implemented in the grayscale / luminescence brightness converter 104 of the video display device 101 is different from that of Example 1 . Therefore, the characteristics of the gradation-display luminance conversion LUT different from Example 1 will be described below, and other redundant descriptions will be omitted.

[0136] Figure 7 is a graph representing the luminance discriminability threshold contrast characteristic with respect to th...

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Abstract

An image display apparatus is provided that avoids discontinuity in a high luminance and gradation range and is capable of displaying gradations where differences in sense of luminance change at equal intervals from an intermediate gradation range to the maximum value of the gradations. A gradation / light emission luminance converter(104) converts the gradation of an input image into data corresponding to a luminance to be displayed by a video light emitter(107) using predetermined conversion characteristics. In an intermediate gradation range, the common logarithms of the luminance to be displayed by the video light emitter(107) have a proportional relation to the gradations. In the high luminance and gradation range, the relation gradually deviates from the proportional relation; the nearer the gradation approaches the maximum value thereof, the larger the variation quantity of the common logarithm of the luminance to be assigned to an increment of the gradations becomes.

Description

technical field [0001] The present invention relates to an image display device for displaying gradation of an image according to luminance, and more particularly, to control for correcting the relationship between the gradation of an image and display brightness in accordance with human visual characteristics. Background technique [0002] The brightness (illuminance) that can be discerned by humans in nature ranges from 1×10 -3 to 1×10 5 extended over a wide range of lx. It is said that humans perceive brightness as a magnitude proportional to the common logarithm of the actual brightness. Therefore, conventional image display devices such as CRTs, liquid crystal displays, plasma displays, and organic EL displays assign display luminance to each pixel so that the common logarithm of the luminance displayed on the image display unit is related to the grayscale of the input image. degree has a proportional relationship. [0003] However, the closer the luminance approach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09F9/00G09G3/36G09G5/00H04N5/58H04N5/66
CPCG09G3/2007G09G2320/0673G09G2360/144H04N5/202H04N5/58H04N21/42202H04N21/4318G09G5/10
Inventor 川井隆町田纯一小松知
Owner CANON KK
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