Adjustable video sharpness circuit

Details Adjustable video sharpness circuit Adjustable video sharpness circuit

1990-11-26

1992-07-28

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 5208

Patent

active

051344823

ABSTRACT:
A video sharpness circuit comprising a delay circuit and a mixer for mixing an input video signal and the input video signal delayed by the delay circuit to develop an output video signal having improved sharpness. The mixer has a nonlinear gain for sharpening higher amplitude video signals more than lower amplitude video signals, and a circuit for adjusting the nonlinearity of the mixer.

REFERENCES:
patent: 3800077 (1974-03-01), Smith
patent: 4263616 (1981-04-01), Lee
patent: 4536796 (1985-08-01), Harlan
patent: 4573075 (1986-02-01), Bolger
patent: 4994915 (1991-02-01), Takahashi et al.

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