Fuji Xerox Co., Ltd.

Norikazu Sakai

Mitsuo Shimizu

Kosuke Shimizu

Kazunori Sato

An image reading apparatus includes: an illumination unit that is disposed so as to be moved relative to a recording medium and illuminates the recording medium with light beams of plural colors that are circulated in predetermined order; a reading unit that reads an image recorded on the recording medium by receiving reflection light that is produced as a result of the illumination unit's illuminating the recording medium during the moving relative to the recording medium; and a control unit that controls the illumination unit so that a difference between a first illumination interval and a second illumination interval is determined based on a reading resolution of the reading unit.

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

An image reading apparatus includes an apparatus body; a transport device that is openable and closable; an image reading unit disposed in one of the apparatus body and the transport device and reading an image of the document transported by the transport device; a member to be read that is disposed in the other of the apparatus body and the transport device at a position opposite the image reading unit when the transport device is closed, the member to be read being read by the image reading unit; and a control unit that causes the image reading unit to read the member to be read at a predetermined time, and if the transport device is open at the predetermined time, causes the image reading unit to read the member to be read when the document is transported by the transport device.

Image reading apparatus with transport device control

An image reading apparatus includes an image reading unit that includes plural photoelectric conversion elements arranged therein and that reads an image using light, the light being reflected by a document transported to a read position and being received by the plural photoelectric conversion elements, a reference plate that is disposed at the read position, a correction data generating unit that generates correction data by modifying second reference data on the basis of a ratio of first reference data to the second reference data, the first reference data being obtained by the image reading unit using light reflected by the reference plate in a clean state, the second reference data being obtained by the image reading unit using light reflected by the reference plate before reading an image, and an image correcting unit that corrects the image on the basis of the correction data generated by the correction data generating unit.

Image reading apparatus, image forming apparatus, and image reading method

An image reading apparatus includes a reading unit, an extraction unit and a generation unit. The reading unit outputs reference plate reading information. The extraction unit sets a pixel of the reference plate reading information as a notice pixel and repeatedly extracts one of the notice pixel as a target pixel until the number of the target pixels is more than a predetermined value when a ratio of a pixel value of the notice pixel to an initial value is more than a predetermined range. The generation unit generates correction information by substituting a pixel value of the target pixel with a correction value using the initial value when the extraction unit extracts all pixels of the reference plate reading information, and generates correction information by setting the pixel values of all the pixels as the initial value when the extraction unit does not extract all the pixels.

Image reading apparatus, image forming apparatus and computer-readable medium

An image reading device includes: a first light source that irradiates light on a first side of an object; a memory that stores a plurality of parameters for controlling an intensity of the light emitting devices, each of the plurality of parameters corresponding to one of a plurality of groups; a controller that controls an intensity of the light emitting devices in response to one of the plurality of parameters stored in the memory; a first image reading unit that reads reflected light from the first side and generates monochrome image data on the basis of the read reflected light; and a second image reading unit that reads reflected light from the second side and generates monochrome image data on the basis of the read reflected light.

Image reading device, image reading method and copier

A document deciding apparatus includes: a light source; a light-quantity detection unit detecting a reference light quantity based on irradiation of the light source, and respective light quantities of plural colors based on reflection from or transmission through a document; a decision unit deciding whether the document is colorless or colored, in accordance with a predetermined criterion on the basis of the light quantities of plural colors detected by the light-quantity detection unit; and a control unit performing a control so as to alter the criterion of the decision unit or a value corresponding to the light quantities detected by the light-quantity detection unit, on the basis of a change of the reference light quantity detected by the light-quantity detection unit.

Document deciding apparatus, document reading apparatus, image forming apparatus and document deciding method

A light source control apparatus that includes a light quantity detection unit that respectively detects light quantities of three colors of light emitted from a light source part. A light quantity ratio calculation unit that then calculates light quantity ratios of reflection light detected by the light quantity detection unit. When the light quantity detection unit detects light quantities of respective reference of the lights emitted from the light source part, a determination unit determines whether or not the light quantity ratios calculated by the light quantity ratio calculation unit are within a predetermined range. Responsive to the determination of the determining unit, a light quantity ratio adjustment unit adjusts the light quantity ratios of the lights emitted from the light source part on the basis of the light quantity of green-colored reflection light emitted from the light source part.

Light source control apparatus, image reading apparatus, image forming apparatus, medium storing light source part control program, and method for controlling of light source part by adjusting light quantity ratios

An image reading apparatus that reads out an original document image synchronously with a frequency dispersion clock gained by modulating the frequency of a reference clock so as to be changed cyclically at a predetermined modulation period, comprising:

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Kanagawa, Japan

Norikazu Sakai