Facsimile and static presentation processing – Facsimile – Picture signal generator
Patent
1995-06-07
1997-11-18
Vu, Kim
Facsimile and static presentation processing
Facsimile
Picture signal generator
358474, 358450, 358494, 358497, 355 25, 399362, H04N 104, H04N 100, G03B 2732, G03B 2752
Patent
active
056893485
ABSTRACT:
An image reading device capable of preventing, by increasing the quantity of light at the center or bound portion of a spread book document, the quantity of light from becoming short and preventing density from becoming irregular due to the deviation of a focus. At and around the center of a spread book document where the document is bound, the quantity of light for illumination or the amplification gain of image data read from the document is increased. A plurality of fluorescent lamps illuminate the surface of the document at the upstream side and downstream side with respect to an intended scanning direction. When the edge of the document is to be detected, only one of the lamps is turned on to enhance the stripe pattern representative of the stepped edge portion of the document.
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Bannai Kazunori
Fujioka Tetsuya
Shiina Susumu
Taguchi Kazushige
Takahashi Hiroshi
Harris Tia M.
Ricoh & Company, Ltd.
Vu Kim
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