Image reader
AssigneeFuji Xerox Co., Ltd.
InventorsShin Kondo, Kosuke Shimizu
Life of this patent
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Abstract
An image reader reads an image on a sheet document while feeding the sheet document by an automatic document feeder (ADF). A CCD sensor includes first pixel rows and a second pixel row. The first pixel rows read R, G, B color components of a document image while scanning the document in a main scanning direction. The second pixel row is disposed at a predetermined distance in a sub-scanning direction from the first pixel rows. The second pixel row reads one color component of the document image. The image reader uses the CCD sensor to detect noise component on image data read by the first pixel rows or the second pixel row based on each of image data read by the first and second pixel rows and to eliminate the detected noise component.
Claims17
An image reader comprising
- a feeding unit for feeding a document to a reading position;
- a first reading unit for reading a plurality of color components of a document image while scanning the document fed to the reading position by the feeding unit in a main scanning direction corresponding to a direction perpendicular to the feeding direction of this document;
- a second reading unit disposed at a predetermined distance from the first reading unit in a sub-scanning direction corresponding to the document feeding direction, the second reading unit for reading one of the plurality of color components of the document image while scanning the document fed to the reading position by the feeding unit in the main scanning direction;
- a noise detecting unit for detecting a noise component on image data read by one of the first reading unit and the second reading unit based on the plurality of pieces of image data read by the first reading unit and the second reading unit.
Dependencies are inferred from the claim text.