Color correction device for correcting color distortion and gamma characteristic
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United States of America Patent
Stats
-
Sep 7, 1999
Grant Date -
N/A
app pub date -
Aug 28, 1997
filing date -
Aug 28, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A color correction device is disclosed for correcting color distortion in a displayed television image. Internal circuitry of a television receiver has a color signal distortion characteristic, and the cathode ray tube (CRT) in the television receiver has a gamma characteristic according to which display color is distorted. The color correction device includes an average luminance level calculator for calculating the average luminance level of an image signal displayed by the CRT. Based on the average luminance level calculated by the average luminance lever calculator, a selection is made of appropriate sets from a plurality of available sets of coefficient correction values and a plurality of sets of gamma correction values. The color signal input to the television receiver is then corrected according to the selected sets of coefficient correction values and gamma correction values. As a result, the color correction device adaptively changes the coefficient correction values and the gamma correction values according to the calculated average luminance level, thereby providing excellent quality of a picture.
First Claim
Family
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Cited Art Landscape
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