Gradation correction method and device

Details Gradation correction method and device Gradation correction method and device

1994-12-29

1997-08-26

Stoll, Thomas L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358523, 348674, H04N 5202, H04N 969

Patent

active

056615752

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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