Video signal processing circuit

Details Video signal processing circuit Video signal processing circuit

1989-08-23

1990-12-18

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, 358 96, 358174, 358177, H04N 5213, H04N 700, H04N 552

Patent

active

049790439

ABSTRACT:
A video signal processing circuit comprises an amplifying circuit including selectable amplifying portions with different amplification factors, respectively, and an outline emphasizing circuit including portions with different degrees of outline emphasis, respectively. The relationship of the outline emphasizing circuit and the amplifying circuit is such that the degree of outline emphasis is dependent upon the amplification factor, so that the conspicuousness of noise is reduced. Where three amplification portions are employed, two of them having amplification factors smaller than the third may be connected to an outline emphasizing portion having the larger outline emphasis degree of a pair of outline emphasizing portions and the third may be connected to the outline emphasizing portion of smaller outline emphasis degree, whereby a similar outline emphasis is obtained for two different amplification factors.

REFERENCES:
patent: 4525738 (1985-06-01), Imazeki et al.
patent: 4748677 (1988-05-01), Yokomizo
patent: 4839725 (1989-06-01), Ueda

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