Gamma-correction circuit for graphic signals

Details Gamma-correction circuit for graphic signals Gamma-correction circuit for graphic signals

2007-10-24

2011-10-11

Saltarelli, Dominic D (Department: 2421)

Television

Image signal processing circuitry specific to television

Gray scale transformation

C348S254000, C348S255000, C382S275000, C345S589000

Reexamination Certificate

active

08035749

ABSTRACT:
The present invention provides a gamma-correction circuit, which is capable to decrease the noise in graphic signal or make the noise not clearly sensible while carrying out gamma-correction on the graphic signals. In the circuit, a high-pass filter is used to decrease the noise in a graphic signal, a gamma-correction section is used for carrying out gamma-correction on the noise suppressed graphic signal, meanwhile a threshold handling section is used for threshold treatment on the high frequency component of the graphic signal to decrease noise, and then the output of the threshold handling section is combined with the gamma-corrected graphic signal through an adder.

REFERENCES:
patent: 06 197240 (1994-07-01), None

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