Image reader

Details Image reader Image reader

1997-10-22

1999-11-30

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358497, H04N 104

Patent

active

059952458

ABSTRACT:
The present invention pertains to a book scanner that reads the image of an document such as a book or magazine while it is placed open and face up, and more particularly, to an image reader that detects the height distribution of the document prior to performing a pre-scanning to detect the size of the document and the background luminance of the document. Thus, a focal length adjustment is performed in response to the detected height distribution while the pre-scanning takes place in order to prevent defocusing caused by the curvature of the document consisting of an open book or magazine. The book reader also reads the book in at least two spectral regions to detect and eliminate image anomalies.

REFERENCES:
patent: 5084611 (1992-01-01), Okisu et al.
patent: 5416609 (1995-05-01), Matsuda et al.
patent: 5585926 (1996-12-01), Fujii et al.
patent: 5677776 (1997-10-01), Matsuda et al.
patent: 5706050 (1998-01-01), Nishimura et al.
patent: 5764379 (1998-06-01), Matsuda et al.
patent: 5764380 (1998-06-01), Noguchi
patent: 5764383 (1998-06-01), Saund et al.
patent: 5831750 (1998-11-01), Okisu et al.

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