Combined video AGC and digitizing circuit

Details Combined video AGC and digitizing circuit Combined video AGC and digitizing circuit

1985-05-02

1986-12-09

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358168, 358169, H04N 553, H04N 552, H04N 557

Patent

active

046283625

ABSTRACT:
An automatic gain control (AGC) and digitizing circuit, particularly suitable for use in digital video image processing and/or display systems, is disclosed. This circuit advantageously defines an active window within an image area and operates the AGC only on the active window in order to ensure that the active window is always displayed, on a remote monitor, with proper brightness and contrast. The active window can be located anywhere within the image area and can be set to encompass an area extending from only a single picture element to the entire image area.

REFERENCES:
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patent: 3909521 (1975-09-01), Hunt et al.
patent: 4318129 (1982-03-01), Zwirn
patent: 4363976 (1982-12-01), Minor
patent: 4402087 (1983-08-01), Sakamoto et al.
patent: 4434439 (1984-02-01), Steckler et al.
patent: 4517586 (1985-05-01), Balaban et al.
patent: 4523232 (1985-06-01), Kameda et al.
patent: 4525741 (1985-06-01), Chahal et al.
patent: 4540974 (1985-09-01), Schanne et al.

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