Gradation compensating apparatus for a video signal

Details Gradation compensating apparatus for a video signal Gradation compensating apparatus for a video signal

H - Electricity

04

N

H04N 9/68 (2006.01) H04N 5/20 (2006.01)

Patent

CA 2128758

A gradation compensating apparatus comprises a skin color detecting circuit for detecting a skin color signal from an inputted color difference signal, a compensation amount controlling circuit for controlling the signal level by the skin color detecting signal as a compensating signal, an APL detecting circuit for detecting an APL level from an inputted luminance signal and for outputting the detected APL level as an APL voltage, an APL controlling circuit for controlling the compensating signal level by the APL voltage, an output circuit for outputting a compensating output voltage by controlling the compensating signal with an inputted do voltage, and a CRT driving circuit for controlling the brightness of the picture by using the compensating output voltage ae a cutoff reference voltage.

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