System for automatic color balance correction

Facsimile and static presentation processing – Static presentation processing – Attribute control

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H04N 9535

Patent

active

040515117

ABSTRACT:
Color balance of a color television picture is corrected during those periods when the luminosity falls within prespecified limits and when simultaneously the chroma-saturation is below a prespecified level. A switch operates to change the time constant of an integrator for derivation of a control signal indicative of when the simultaneous conditions are met. One time constant is used when the simultaneous conditions begin and another when they end, thereby allowing better correction of color stains which do not extend uniformly over the entire picture.

REFERENCES:
patent: 3562410 (1971-02-01), Lovely
patent: 3627911 (1971-12-01), Kubota et al.
patent: 3735026 (1973-05-01), Smith et al.

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