Contour accentuation circuit for a color signal

Details Contour accentuation circuit for a color signal Contour accentuation circuit for a color signal

1991-01-15

1993-03-02

Peng, John K.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358174, 375 98, H04N 964, H04N 552

Patent

active

051914077

ABSTRACT:
A contour accentuation circuit for color signal comprises a variable gain amplifier, an output circuit and differential circuit. The output circuit outputs the signal according to the output signal from the variable gain amplifier and outputs the constant level signal to the output signal of amplitude level over predetermined level from the amplifier. The differential circuit differentiates the output signal from the output circuit and the amplifier amplifies and accentuates the contour of the input signal under the output control signal from the differential circuit.

REFERENCES:
patent: 3515804 (1970-06-01), Foote
patent: 3946153 (1976-03-01), Peth et al.
patent: 4090217 (1978-05-01), Goyal et al.
patent: 4327373 (1982-04-01), Gomi
patent: 4400721 (1983-08-01), Macovski
patent: 4581631 (1986-04-01), Sonnenberger
patent: 4739395 (1988-04-01), Johanndeiter et al.
patent: 4989074 (1991-01-01), Matsumoto

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