Image reader for facsimile apparatus or the like

Details Image reader for facsimile apparatus or the like Image reader for facsimile apparatus or the like

1985-06-06

1986-07-15

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 53, 358282, G06K 938

Patent

active

046010580

ABSTRACT:
An image reading device for a facsimile apparatus or the like compensates outputs of a line image sensor by shading while reading out a document. When a reference signal representative of a particular pixel is derived from a contaminated portion of a reference or white image, a reference signal representative of a pixel which immediately precedes that particular pixel is substituted for the latter. This promotes accurate shading which is free from the influence of contamination.

REFERENCES:
patent: 3927309 (1975-12-01), Fujiwara et al.
patent: 4298895 (1981-11-01), Arai et al.

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