Method and apparatus for reading image information formed on mat

Details Method and apparatus for reading image information formed on mat Method and apparatus for reading image information formed on mat

1989-08-15

1991-12-03

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358461, 358464, 358482, H04N 140

Patent

active

050704141

ABSTRACT:
To read a document accurately and produce an image signal faithfully representing the document, an image reading method and apparatus adopts various means, of "latching an average light-shielded signal in a digital form", "using an average light-shielded signal resulting from averaging output signals of a plurality of light-shielded pixels as a black reference signal", "replacing that part of an image signal in which an average light-shielded signal is larger than an effective pixel signal in level with a signal of a zero level", "driving CCD sensors at such timing as to allow effective pixel signals output from the CCD sensors to be continuous in time" and "setting DC offset voltages of signals output from CCD sensors to a predetermined clamp potential."

REFERENCES:
patent: 4567527 (1986-01-01), Yokomizo
patent: 4903144 (1990-02-01), Stefanik et al.
patent: 4920428 (1990-04-01), Lin et al.

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