Hue correction apparatus having a restricted range

Details Hue correction apparatus having a restricted range Hue correction apparatus having a restricted range

1975-05-23

1976-12-07

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 912

Patent

active

039966089

ABSTRACT:
Hue correction apparatus of the general type described in U.S. Pat. No. 3,663,744 is provided. 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, making use of a wide bandwidth phase detector, 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. The range of angles and response of the apparatus is restricted by means of an offset bias control coupled to the chrominance signal adder circuits. Green and blue tones are relatively unaffected by the system operation. Good transient response of the correction apparatus is provided at sharp color transitions.

REFERENCES:
patent: 3663744 (1972-05-01), Harwood
patent: 3740459 (1973-06-01), Okada

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