Gradation correction method and device
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United States of America Patent
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Aug 26, 1997
Issued Date -
N/A
app pub date -
Dec 29, 1994
filing date -
Oct 9, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The gradation correction device includes a luminance signal convertor to generate a luminance signal from the input R, G, B signals, a correction coefficient calculator which calculates the ratio to the luminance signal of the luminance signal after gamma correction to the predetermined gradation characteristics, and a multipliers to multiply the output from the correction coefficient calculator by each of the R, G, and B input signals. When the gradation correction is applied, effective brightness adjustment can be applied with no change in hue and saturation and without exceeding the dynamic range of a device.
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