Integratable color correction circuit

Details Integratable color correction circuit Integratable color correction circuit

1986-10-07

1988-06-28

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 27, H04N 977

Patent

active

047543213

ABSTRACT:
A color signal correction circuit matrixes the R-Y and B-Y color difference signals to develop an I axis signal for application to a signal correction circuit. The I axis signal is also supplied to a comparator which feeds a counter, the output of which is connected to a digital-to-analog converter that, in turn, supplies the comparator and the color signal correction circuit. The comparator and the counter are enabled during the color burst time when there is no color in the color difference signals. The DC level of the I matrix is determined by the count in the counter to enable the color signal correction circuit to determine the polarity and magnitude of the I axis signal and provide appropriate correction to the B-Y color difference signal.

REFERENCES:
patent: 4219840 (1980-08-01), Srivastava
patent: 4285005 (1981-08-01), Srivastava
patent: 4296432 (1981-10-01), Engel et al.
patent: 4549098 (1985-10-01), Fushiki
"Analog-Digital Conversion Handbook" by The Engineering Staff of Analog Devices, Inc. Analog Devices, Inc., pp. III 84-85, 1972.

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