Hue correction apparatus controlled by chrominance saturation

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

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H04N 9535

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active

040515109

ABSTRACT:
Automatic hue correction apparatus of the general type described in U.S. Pat. No. 3,663,744 is modified to provide a reduction in flesh tone hue correction as a function of chrominance signal level. Chrominance signals are monitored on a dynamic basis and the phase of a color subcarrier reference signal is automatically altered when the chrominance signals are in the vicinity of the flesh tone (+I) axis. The phase of the reference subcarrier is altered by controllably adding a portion of an amplitude limited chrominance signal to the subcarrier so as to shift the subcarrier phase towards the phase of the chrominance signal. A normal phase correction range of the apparatus is controllably inhibited in the presence of relatively large amplitude chrominance signals representative of saturated colors.

REFERENCES:
patent: 3708614 (1973-01-01), Nakabe et al.
patent: 3871023 (1975-03-01), Caprio
"A Novel Automatic Hue Control System", IEEE Transactions on Consumer Electronics, vol. CE-21 No. 2 May 1975, pp. 155-163.

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