Contour compensator for carrier chrominance signal

Details Contour compensator for carrier chrominance signal Contour compensator for carrier chrominance signal

1991-04-19

1991-12-03

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

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H04N 968

Patent

active

050703986

ABSTRACT:
A contour compensator according to the present invention contour-enhances first and second demodulated signals, which are obtained by temporarily demodulating a carrier chrominance signal by first and second demodulators, instead of directly contour-enhancing the carrier chrominance signal itself since contour enhancement of the carrier chrominance signal itself is difficult. The first and second demodulated signals are low-frequency components and have only amplitude information, and hence contour enhancement thereof is relatively easy.
Thereafter the contour-enhanced first and second demodulated signals are modulated by first and second modulators under the same condition as that in demodulation and composed by an adder, thereby to generate a contour-enhanced carrier chrominance signal. Thus, the newly generated carrier chrominance signal is reliably contour-enhanced, with no hue change or saturation change.

REFERENCES:
patent: 2830112 (1958-04-01), Pritchard
patent: 3711635 (1973-01-01), Worden
patent: 3825673 (1974-07-01), Schreiner et al.
patent: 4459613 (1984-07-01), Faroudja
patent: 4918528 (1990-04-01), Oohashi
A Method for Calculating the Sharpness of TV Pictures, Haruo Isono, Jul. 1983, vol J66-B, No. 7.
Morgenstern, B.: Farbfernsehtechnik, Teubner Studienskripten.

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