Document reading apparatus having a function of determining effe

Details Document reading apparatus having a function of determining effe Document reading apparatus having a function of determining effe

1992-12-01

1994-12-27

Hjerpe, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358463, 358448, H04N 138

Patent

active

053770196

ABSTRACT:
A document reading apparatus which can determine an effective image pickup area containing no object such as operator's hands or fingers pressing a document and rectify image data prior to imaging operation, making use of a difference of the object from the document in chromaticity, luminous density, and the like.

REFERENCES:
patent: 3801823 (1974-04-01), Korn
patent: 4958217 (1990-09-01), Kimura et al.
patent: 5019917 (1991-05-01), Hata et al.
patent: 5084611 (1992-01-01), Okiso

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