Dynamic gain adjuster for an image scanner

Details Dynamic gain adjuster for an image scanner Dynamic gain adjuster for an image scanner

1985-02-19

1987-01-27

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, 358167, 358213, 358284, H04N 514, H04N 314, H04N 140

Patent

active

046397817

ABSTRACT:
A dynamic gain adjusting arrangement modifies video signals produced by image scanners to achieve high quality pictures. The arrangement compensates for amplitude distortions of the video signal caused by lens vignetting and variations in lighting conditions. The video signals are compensated for these distortions by applying continuous gain adjustment to video information generated by a photosensor and by dynamically changing the gain adjustment parameters on a line-by-line basis according to an input signal reflecting the instantaneous background level.

REFERENCES:
patent: 4200934 (1980-04-01), Hofmann
patent: 4298887 (1981-11-01), Rode
patent: 4343021 (1982-08-01), Frame
patent: 4386434 (1983-05-01), Gibson et al.
patent: 4486781 (1984-12-01), Wilmer et al.
patent: 4520395 (1985-05-01), Abe
patent: 4554460 (1985-11-01), Klein

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