Flesh correction circuit and method of flesh correction

Details Flesh correction circuit and method of flesh correction Flesh correction circuit and method of flesh correction

1992-06-10

1993-10-19

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 28, 358 23, H04N 964

Patent

active

052550761

ABSTRACT:
The present invention relates to a flesh correction circuit with a simple structure and a small size. A first I-axis demodulation circuit and a first O-axis demodulation circuit demodulate a chrominance signal using a first I-axis reference signal and a first Q-axis reference signal to generate a first I-axis demodulated signal and a first Q-axis demodulated signal, respectively. By multiplication of the two demodulated signals, a multiplier generates an original correction signal. Under the control of a selection switch, the original correction signal is allowed to serve as a correction signal as long as the first I-axis demodulated signal stays at a positive potential, or otherwise, the correction signal is fixed at a fixed potential. Via a low pass filter, the correction signal is supplied to a variable phase shifter which shifts a phase of the first I-axis reference signal by an amount which is determined according to the value of the correction signal, whereby a second I-axis reference signal is derived. Using the second I-axis reference signal, a second I-axis demodulation circuit demodulates the chrominance signal, generating a second I-axis demodulated signal. The selection switch also controls a period in which flesh correction is performed.

REFERENCES:
patent: 4051510 (1977-09-01), Cochran
patent: 4306247 (1981-12-01), Tomimoto
patent: 4327374 (1982-04-01), Matsuda
patent: 4533938 (1985-08-01), Hurst
patent: 4611240 (1986-09-01), Harwood
IEEE Transactions on Consumer Electronics, Feb. 1976, pp. 111-117, L. A. Harwood, "A Chrominance Demodulator IC with Dynamic Flesh Correction".

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