Method for processing picture to be reproduced on color picture tube and processor therefor
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United States of America Patent
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May 7, 1991
Grant Date -
N/A
app pub date -
Jul 10, 1989
filing date -
Jul 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed herein is a method for processing a first picture to be reproduced on a color picture tube. The value e.sub.ys of luminance signal for a shadow S of a second picture, which has been obtained from a preceding scanning operation, is subtracted from the value e.sub.y of luminance signal for a desired pixel P out of video signals received, thereby determining the value e.sub.p of a base luminance signal. Luminance signal values e.sub.s and e.sub.h are set respectively for a shadow S and a highlight H among pixels of the first picture to be reproduced on the color picture tube. The value e.sub.q of a luminance signal for a pixel Q, which corresponds to the pixel P and is to be reproduced, is determined from the signal values e.sub.p, e.sub.s and e.sub.h in accordance with a particular correction formula. The luminance of each pixel, which is to be reproduced on the color picture tube, is adjusted in accordance with the value e.sub.q of the corresponding luminance signal thus determined. A picture signal processor suitable for use in the practice of the method is also disclosed.
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