Hue control for color video systems

Details Hue control for color video systems Hue control for color video systems

1990-02-20

1992-11-03

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 23, 358 27, H04N 964

Patent

active

051610051

ABSTRACT:
A hue control circuit receives a video signal at an input terminal in the form of alternating multiplexed color difference samples Cb and Cr. The video signal is multiplied in a multiplier by a factor cos .phi., .phi. representing a desired hue adjustment, and the resulting multiplied signal is supplied to an adder. The video signal is also subjected to order inversion by flip-flops and a buffer circuit as a result of which the order of corresponding pairs of samples Cb and Cr is reversed. The reversed-order video signal is multiplied in a second multiplier by one of alternating factors -sin .phi. and +sin .phi., and the resulting multiplied signal is supplied to the adder. The multiplied signals are summed in the adder to produce hue adjusted color difference samples Hb and Hr, where:

REFERENCES:
patent: 4550339 (1985-10-01), Fling
patent: 4554576 (1985-11-01), Kao
patent: 4558351 (1985-12-01), Fling et al.
patent: 4809059 (1989-02-01), Flamm et al.

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