Gamma correction circuit

Details Gamma correction circuit Gamma correction circuit

1995-11-06

1997-09-23

Peng, John K.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348674, 348254, H04N 5202

Patent

active

056710232

ABSTRACT:
A gamma correction circuit capable of faithfully monitoring and outputting the color and luminance of an object without deteriorating the resolution. The gamma circuit includes an output-picture luminance signal generator for converting supplied color picture signals into luminance signals and for gamma-correcting the luminance signals for generating output-picture luminance signals, a low-pass filter for transmitting low-frequency components of the supplied picture signals, a luminance correction signal generator for generating a luminance correction signal by subtraction between a signal obtained on gamma-correcting picture signals supplied from the low-pass filter and converting the gamma-corrected picture signals into luminance signals and a signal obtained on converting the picture signals into luminance signals and gamma-correcting the luminance signals, an output-picture luminance signal correction unit for correcting the output-picture luminance signal based upon the output-picture luminance signal and the luminance correction signal, and a color difference matrix circuit for effecting chroma-conversion of the gamma-corrected picture signals supplied from the low-pass filter.

REFERENCES:
patent: 2898397 (1959-08-01), Richman
patent: 4415923 (1983-11-01), Noda
patent: 5184212 (1993-02-01), Yamamoto et al.
patent: 5296920 (1994-03-01), Sakaue et al.

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