Television – Image signal processing circuitry specific to television – Hue control
Patent
1994-06-30
1996-03-26
Groody, James J.
Television
Image signal processing circuitry specific to television
Hue control
348712, 348713, 348692, H04N 964, H04N 520
Patent
active
055025080
ABSTRACT:
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 dc voltage, and a CRT driving circuit for controlling the brightness of the picture by using the compensating output voltage as a cutoff reference voltage.
REFERENCES:
patent: 3760099 (1973-09-01), Kong
patent: 4369466 (1983-01-01), Matsuzaki et al.
patent: 5351141 (1994-09-01), Tsuji et al.
Kageyama Atsuhisa
Kawabata Minoru
Burgess Glenton B.
Groody James J.
Matsushita Electric - Industrial Co., Ltd.
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