Image quality correction circuit and method based on color densi

Details Image quality correction circuit and method based on color densi Image quality correction circuit and method based on color densi

1997-01-31

1999-06-08

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348679, 348690, H04N 521, H04N 552

Patent

active

059108231

ABSTRACT:
An image quality correction circuit having a variable gain amplifier for amplifying an extracted high-frequency component of a luminance signal in such a mariner that the gain thereof is increased when detected color density is high, and is reduced when the detected color density is low, and a slice circuit for slicing the outputted amplitude of the variable gain amplifier at a prescribed value, wherein a corrected luminance signal is obtained by combining an image quality correction signal outputted from the slice circuit with the luminance signal to be corrected.

REFERENCES:
patent: 3780215 (1973-12-01), Shibata
patent: 4316215 (1982-02-01), Yasumoto et al.
patent: 4337479 (1982-06-01), Tomimoto et al.
patent: 5032909 (1991-07-01), Sato et al.
patent: 5124787 (1992-06-01), Lee

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