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

1994-04-12

1997-04-15

Peng, John K.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348630, 348690, H04N 552

Patent

active

056214804

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 manner 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: 4316215 (1982-02-01), Yasumoto et al.
patent: 4337479 (1982-06-01), Tomimoto et al.
patent: 5032909 (1991-07-01), Sato et al.

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