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Image signal processing method, image signal processing apparatus, and image displaying apparatus

A technology for image signal processing and display devices, which is applied in image communication, TV, color TV parts, etc., and can solve problems such as inability to restore brightness, grayscale distortion, and inability to recognize grayscale changes, etc.

Inactive Publication Date: 2006-05-17
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In this way, according to the conventional non-linear correction method, since the display device is affected by the ambient light of the place where it is installed, it cannot restore the brightness perceived by people to a linear characteristic, especially when the input grayscale is low and dark The grayscale changes in the image, so there is a problem of grayscale distortion

Method used

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  • Image signal processing method, image signal processing apparatus, and image displaying apparatus
  • Image signal processing method, image signal processing apparatus, and image displaying apparatus
  • Image signal processing method, image signal processing apparatus, and image displaying apparatus

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Embodiment 1

[0025] FIG. 1 is a circuit block diagram of an image display device 100 according to Embodiment 1 of the present invention. The image signal processing device 101 performs nonlinear correction on the input image signal, that is, the input gray scale, and outputs it to the display device 103. The display device 103 is a display device that does not have gamma characteristics using DMD, PDP, or the like. The image signal processing device 101 has an ambient light detection unit 104 that detects the brightness of the surroundings, and a conversion unit 105 that non-linearly corrects the input gradation based on the brightness of the surroundings.

[0026] The ambient light detection unit 104 has a photosensor 106 that detects the brightness of the surroundings and an AD conversion unit 107 that converts the detection signal from the photosensor 106 into a digital signal. The conversion unit 105 has a plurality of LUTs 108 for non-linear correction of the input gray scale 1 ~108 4 And...

Embodiment 2

[0033]FIG. 4 is a circuit block diagram of an image display device 300 according to Embodiment 2 of the present invention. The same reference numerals are given to the same circuit blocks as in the first embodiment, and the description thereof is omitted. The difference between the second embodiment and the first embodiment is that not only the characteristics of the nonlinear correction are changed according to the surrounding light, but also the display mode of the display device 103 is changed. For example, in a display device using a PDP, in terms of its driving principle, there is a trade-off between the number of gray levels that can be displayed (hereinafter referred to as "gray display capability") and the maximum brightness that can be displayed. Relationship. Therefore, as the display mode of the display device 103, "dynamic mode", "standard mode", "movie mode", etc. are set, and it is designed so that the user can select the display mode he likes. Here, the "dynamic mod...

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Abstract

An image signal processing method, which is an image signal processing method for performing nonlinear correction on an image signal input to a display device (103), characterized in that: according to the brightness of a place where the display device (103) is installed, the nonlinear Modified properties. According to this method, even if the display luminance of the display device (103) is uniformly increased due to the influence of ambient light, the characteristic of brightness perceived by human beings with respect to an image signal can be made linear.

Description

Technical field [0001] The present invention relates to an image signal processing method, an image signal processing device, and an image display device using the image signal processing device for nonlinearly correcting an image signal. Background technique [0002] Human visual characteristics are non-linear. In particular, as shown in Fig. 5, the brightness perceived by humans has a logarithmic function with respect to brightness. In addition, as shown in FIG. 6A, the display brightness of the image signal of the CRT (Cathode Ray Tube) has a so-called gamma (γ) characteristic. Therefore, in a display device using a CRT, the gamma characteristic and the visual characteristic of the logarithmic function cancel each other out, and the brightness perceived by humans is basically linear with respect to the image signal. [0003] In contrast, display devices such as DMD (Digital Mirror Device) or PDP (Plasma Display Panel) that have been on the market in recent years do not have ga...

Claims

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Application Information

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IPC IPC(8): H04N5/58
Inventor 山田和弘
Owner PANASONIC CORP
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