Computer graphics processing and selective visual display system – Display peripheral interface input device
Patent
1995-02-03
1998-01-27
Peng, John K.
Computer graphics processing and selective visual display system
Display peripheral interface input device
348671, 348678, H04N 5202
Patent
active
057126593
ABSTRACT:
The video signal data of one of the three primary color signals having the maximum level is adjusted with regard to the amplitude level and the DC level thereof in accordance with a predetermined control data. A difference between the adjusted video signal data and a predetermined threshold level is calculated, and the control data is corrected by ones complement of the differential data. The video signal data of the three primary color signals are adjusted respectively, with regard to the amplitude level and DC level thereof in accordance with the corrected control data. In other words, merely with respect to the digital video signal data with the maximum level, the control and brightness controls are conducted. Then, a difference between the resultant video signal data and a predetermined threshold level is obtained for adjusting the respective contrast levels of the three primary color signals by using ones complement of the obtained differential data.
REFERENCES:
patent: 4253121 (1981-02-01), Avery
patent: 4499494 (1985-02-01), Dischert et al.
Flynn Nathan J.
Mitsubishi Denki & Kabushiki Kaisha
Peng John K.
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