Image reading apparatus which detects document attributes

Details Image reading apparatus which detects document attributes Image reading apparatus which detects document attributes

1996-03-05

1998-12-22

Frahm, Eric

Facsimile and static presentation processing

Natural color facsimile

Scanning

358498, 399367, H04N 146, H04N 104, G03G 2100

Patent

active

058525017

ABSTRACT:
In an image reader with an automatic document feeding (ADF) unit, even when various documents such as color multi-value, color binary, monochrome multi-value, and monochrome binary documents are installed in the ADF unit, the user need not beforehand conduct any setting operations related to the above attributes. The image reading apparatus includes an ADF unit for conveying a document sheet onto a document glass plate a light source for emitting a light beam onto the document, an optical system for receiving reflection light reflected by the document and producing a focused document image, a color image sensor for separating the focused document image into images respectively of a plurality of colors and thereby reading color images, an image read controller having a plurality of read modes, and a carriage for setting an image read position. The image read controller includes a document attribute sensor for detecting a document attribute according to data of the images respectively of plural colors obtained through the document read operation. The document attribute sensor conducts a change-over operation between the plural read modes according to the detected document attribute.

REFERENCES:
patent: 4812877 (1989-03-01), Nishimari et al.
patent: 4929979 (1990-05-01), Kimoto et al.
patent: 5032904 (1991-07-01), Murai et al.
patent: 5041874 (1991-08-01), Nishimari et al.
patent: 5481354 (1996-01-01), Nakajima
patent: 5513017 (1996-04-01), Knedt et al.

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