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Picture signal processing circuit

An image signal processing and image signal technology, which is applied in color signal processing circuits, brightness and chrominance signal processing circuits, image communication, etc., can solve problems such as white square damage and difficulty in seeing images

Inactive Publication Date: 2005-02-16
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, if an adjustment is made to increase the contrast to make a dark image more vivid, on the contrary, in a bright image, the white side may be destroyed at this contrast, and the image may become difficult to see.

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Embodiment Construction

[0015] The best mode for carrying out the present invention will be described below with reference to the drawings. figure 1 is a block diagram of an image signal processing circuit 10 of an embodiment of the present invention, figure 2 is a diagram showing a specific example of the luminance detection circuit 18 .

[0016] The luminance signal processing circuit 12 is a well-known circuit, and performs predetermined processing (such as amplification and filtering) on ​​the luminance signal (Y) separated from the image signal (composite image signal).

[0017] The color demodulation circuit 14 obtains the color difference signal (Ec) from the transmission color signal (Ec) separated from the image signal. R -E Y ,E G -E Y ,E B -E Y ). The color demodulation circuit 14 is also a known circuit, and there are known circuits that operate by a biaxial demodulation method and a triaxial demodulation method.

[0018] The color signal output circuit 16 is a known matrix circu...

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Abstract

A video signal processing circuit comprises a luminance detector circuit for detecting the luminance of a video signal that is input and a contrast adjustment circuit for changing the contrast ratio of each chrominance signal in accordance with a detection result of the luminance detector circuit. As a result, when the luminance is low, for example, the contrast ratio can be increased in accordance with the luminance so that a clearer video image can be obtained.

Description

technical field [0001] The present invention relates to an image signal processing circuit for obtaining color signals from an image signal (composite image signal). Background technique [0002] When the contrast ratio of the display is low, it may be difficult to see dark images clearly. For example, in the case of a liquid crystal display, since the contrast ratio is lower than that of a Brown tube type display, it is often difficult to see a dark image. Furthermore, as a conventional image signal processing circuit, for example, a technique disclosed in Non-Patent Document 1 is known. [0003] [Non-Patent Document 1] Edited by the Japan Broadcasting Association, "NHK TV Technical Textbook (Part 1)", April 10, 1999 [0004] In order to make the dark image output to the display more vivid, the contrast can be increased. Even for LCD monitors, this is one of the effective means. [0005] However, if an adjustment is made to increase the contrast to make a dark image cle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G09G5/10H04N5/14H04N5/52H04N5/57H04N5/66H04N9/68H04N9/77
CPCG09G2320/066H04N9/77G09G3/3611G09G5/10H04N9/68H04N5/57
Inventor 松井宽
Owner SANYO ELECTRIC CO LTD