Fuji Xerox Co., Ltd.

Shin Kondo

Kosuke Shimizu

Katsuya Koyanagi

Mitsuo Shimizu

Shunsuke Hamasuna

Eiji Hamada

Hiroshi Ishii

An image reading apparatus includes: plural image pickup elements which are arranged unidirectionally, each image pickup element including plural photoelectric transducers that convert reflected light from an original document into pixel signals, and a forwarding unit that serially forwards pixel signals acquired by the photoelectric transducers; a dividing unit that divides outputs of the photoelectric transducers into plural processing paths so that pixel signals acquired by photoelectric transducers located on both sides of a boundary between adjacent image pickup elements are included in the same division unit; and an interpolation unit that executes pixel interpolation, using the pixel signals acquired by the photoelectric transducers located on both sides of the boundary among the pixel signals divided by the dividing unit.

Image reading apparatus, image forming apparatus, image reading method and computer readable medium storing program thereof

A duplex simultaneous reading apparatus having an image reading unit for simultaneously reading a first surface and a second surface of a document, the duplex simultaneous reading apparatus includes: a detection unit for detecting any specified pattern image from image data read by the image reading unit; and a selection unit for selectively inputting the read image data of the first surface of the document and the read image data of the second surface to the detection unit in block units, wherein the detection unit detects the specified pattern image in the first surface or the second surface of the document, from the block-unit image data inputted by the selection unit.

Duplex simultaneous reading apparatus, copying apparatus, image processing apparatus and image processing method

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.

Image reader

CCDas an image reading part reads a copy at the upstream and downstream of reading positions, and image data B and A at each of the reading positions are obtained from an output delay circuit and a shading correction circuit, respectively. A streak detectorcompares the image data A with B, and outputs black streak detecting data indicating that the image data A contains black streaky noises, when the image data is not coincident in succession as to a plurality of pixels arrayed in the sub-scanning direction. A streak eliminator normally outputs the image data A, but it outputs the image data B instead of the image data A with regard to the pixels from which the black streak detecting data containing the noise is outputted. The image data reading device of present invention being thus constructed, the device is able to accurately detect streaky noises by adhesion of thrashes to the reading unit, even if there are speed variations in the copy feeding.

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Ebina, Japan

Shin Kondo