Abstract: An image reading apparatus includes a moving unit, a first detecting unit, and a second detecting unit. The moving unit moves a calibration plate in the main scanning direction relatively to a reading apparatus. The calibration plate is a plate for calibrating the reading apparatus. The reading apparatus has a reading unit and reading glass. The reading unit is arranged in the main scanning direction. The reading glass is disposed on a reading surface side of the reading unit. The first detecting unit detects an abnormality on the calibration plate from reading results. The reading results are obtained in such a manner that, while the moving unit is controlled to move the calibration plate, the reading unit reads the calibration plate. The second detecting unit detects an abnormality on the reading glass from the reading results.

Abstract: An image reading apparatus includes a moving unit, a first detecting unit, and a second detecting unit. The moving unit moves a calibration plate in the main scanning direction relatively to a reading apparatus. The calibration plate is a plate for calibrating the reading apparatus. The reading apparatus has a reading unit and reading glass. The reading unit is arranged in the main scanning direction. The reading glass is disposed on a reading surface side of the reading unit. The first detecting unit detects an abnormality on the calibration plate from reading results. The reading results are obtained in such a manner that, while the moving unit is controlled to move the calibration plate, the reading unit reads the calibration plate. The second detecting unit detects an abnormality on the reading glass from the reading results.

Abstract: A printing system includes the following elements. An addition unit creates additional image data having a specific attribute and adds it to original image data, thereby creating document image data. An image forming unit forms a document image including an original image and an additional image on a recording medium on the basis of the document image data. An image reader reads the document image, thereby creating read image data. A difference image creator creates difference image data by calculating a difference between the original image data and the read image data. A canceling unit corrects, on the basis of the specific attribute, the difference image data by canceling a difference generated due to the addition of the additional image data, thereby creating corrected difference image data. An inspection unit performs inspection to find a defect of the original image on the basis of the corrected difference image data.

Abstract: A printing system includes the following elements. An image forming unit forms an image. An image reader reads an image. A first color converter creates second image data. A second color converter creates fourth image data. A determining unit determines whether a pixel value of each of pixels in the first image data or the second image data is located inside or outside an input color gamut that is readable by the image reader. A correction unit corrects pixels located at the same position as a pixel having a pixel value located outside the input color gamut. An inspection unit performs inspection to find a defect of an image. The correction unit performs correction on the pixels located at the same position as a pixel having a pixel value located outside the input color gamut so that the inspection unit does not detect a difference between the corrected pixels.

Abstract: A printing system includes following components. An image forming section forms an image on a recording medium using first image data. A first image creation section creates the first image data by performing first image processing including correction of a characteristic unique to the image forming section and first processing, on original image data. The second image creation section creates second image data by performing second image processing including the first processing but not including the correction of a characteristic unique to the image forming section, on the original image data. The image reading section reads the image on the recording medium to obtain read image data. The detection section detects a defect in the image on the recording medium, by comparing on a pixel-by-pixel basis the read image data or comparison image data obtained by processing the read image data with the second image data.

Abstract: An image reader includes a light source that irradiates light to a recording material on which an image is formed, a generation section that receives light reflected from the recording material and generates image information from the received light, and a processing section that extracts information corresponding to a window region of the recording material set in advance, as correction information, from the image information generated by the generation section when light from the light source is irradiated to the recording material on which the image is formed.

Abstract: A printing system includes following components. An image forming section forms an image on a recording medium using first image data. A first image creation section creates the first image data by performing first image processing including correction of a characteristic unique to the image forming section and first processing, on original image data. The second image creation section creates second image data by performing second image processing including the first processing but not including the correction of a characteristic unique to the image forming section, on the original image data. The image reading section reads the image on the recording medium to obtain read image data. The detection section detects a defect in the image on the recording medium, by comparing on a pixel-by-pixel basis the read image data or comparison image data obtained by processing the read image data with the second image data.

Abstract: A printing system includes the following elements. An addition unit creates additional image data having a specific attribute and adds it to original image data, thereby creating document image data. An image forming unit forms a document image including an original image and an additional image on a recording medium on the basis of the document image data. An image reader reads the document image, thereby creating read image data. A difference image creator creates difference image data by calculating a difference between the original image data and the read image data. A canceling unit corrects, on the basis of the specific attribute, the difference image data by canceling a difference generated due to the addition of the additional image data, thereby creating corrected difference image data. An inspection unit performs inspection to find a defect of the original image on the basis of the corrected difference image data.

Abstract: A printing system includes the following elements. An image forming unit forms an image. An image reader reads an image. A first color converter creates second image data. A second color converter creates fourth image data. A determining unit determines whether a pixel value of each of pixels in the first image data or the second image data is located inside or outside an input color gamut that is readable by the image reader. A correction unit corrects pixels located at the same position as a pixel having a pixel value located outside the input color gamut. An inspection unit performs inspection to find a defect of an image. The correction unit performs correction on the pixels located at the same position as a pixel having a pixel value located outside the input color gamut so that the inspection unit does not detect a difference between the corrected pixels.

Abstract: A printing system includes following components. A deciding unit decides, by using setting data and output image data including pieces of original image data corresponding to plural pages, a printing order in which the plural pages are to be printed. A printing unit respectively prints images of the plural pages on recording media by using the output image data, in accordance with the printing order. A reading unit reads, in accordance with the printing order, the images of the plural pages having been printed on the recording media to obtain pieces of read image data corresponding to the plural pages. An identifying unit identifies pieces of reference image data corresponding to the plural pages of the output image data, in accordance with the printing order. A verification unit verifies, for each page, the piece of read image data of the page against the corresponding piece of reference image data.

Abstract: An image forming apparatus is provided. An exposure component is equipped with a plurality of light emitting elements arrayed along a first direction. An output component is equipped with output ends corresponding to each of the light emitting elements and the output component, when correcting an amount of misalignment in the first direction, outputs drive signals of one line corresponding to a line on a most upstream side of drive signals of plural lines from the output ends that have been shifted by a number corresponding to the amount of misalignment in the first direction. A plurality of connecting wires interconnect each of the output ends and each of the light emitting elements. A judging component is connected to each of the connecting wires, and judges whether or not the drive signals are being normally transmitted through the connecting wire that the judging component has selected.

Abstract: A set value output circuit includes a first output unit and a second output unit. The first output unit outputs a signal input to a first input when a first timing signal is input to a second input, and continues to output the signal until a next first timing signal is input. The second output unit outputs the signal input to a third input when the second timing signal is input to a fourth input, and continues to output the signal until a next second timing signal is input. A selection unit inputs a selected timing signal as the second timing signal to the fourth input. A control unit inputs the first timing signal to the second input, so that a set value for an image to be formed next is output during image formation using the signal output from the second output.

Abstract: An exposing device includes a plurality of exposing units which forms a latent image, wherein exposing units includes: an exposure light source; a rotating polyhedron that reflects light from the exposure light source; a driving source that rotates the rotating polyhedron; a first detecting unit that detects the number of rotations of the driving source; a second detecting unit that detects the light from the exposure light source at a position; and a control unit that performs a first control of the driving source based on a detection signal of the first detecting unit at a start of the rotation of the rotating polyhedron and thereafter performs a second control of the driving source based on a detection signal of the second detecting unit.

Abstract: An image reader includes a light source that irradiates light to a recording material on which an image is formed, a generation section that receives light reflected from the recording material and generates image information from the received light, and a processing section that extracts information corresponding to a window region of the recording material set in advance, as correction information, from the image information generated by the generation section when light from the light source is irradiated to the recording material on which the image is formed.

Abstract: An image formation system includes a medium-pattern-information-read-unit that reads pattern information of a surface of a medium; a pattern-information-image-creation-unit that creates a pattern Information image based on the read pattern information; and a print unit that adds the pattern information image to a print image to be printed on the surface of the medium and prints the print image on the medium.

Abstract: An image forming apparatus includes a paper fiber reading unit that reads fiber properties of a paper sheet; an encryption unit that encrypts at least a part of an input image based on the fiber properties read by the paper fiber reading unit; and a printing unit that prints an encrypted image portion encrypted by the encryption unit and an image including information representing the fiber properties read by the paper fiber reading unit on the paper sheet whose fiber properties are read by the paper fiber reading unit.

Abstract: An exposure device includes a light source, an image processing unit, and a light emitting control unit. In the light source, plural light emitting elements are arranged in main scanning and in sub-scanning directions. The image processing unit, based on image information relating to an image and processing information relating to a processing method of the image, executes image processing of converting into image information for exposure in a processing method corresponding to the processing information. The light emitting control unit controls the light emitting elements in accordance with the image information for exposure to emit light beams. The light emitting control unit controls the light emitting elements which are to emit the light beams based on a periodicity, in the sub-scanning direction, corresponding to the image processing executed in the image processing unit and a periodicity of an arrangement of the light emitting elements in the sub-scanning direction.

Abstract: An image forming apparatus is provided. An exposure component is equipped with a plurality of light emitting elements arrayed along a first direction. An output component is equipped with output ends corresponding to each of the light emitting elements and the output component, when correcting an amount of misalignment in the first direction, outputs drive signals of one line corresponding to a line on a most upstream side of drive signals of plural lines from the output ends that have been shifted by a number corresponding to the amount of misalignment in the first direction. A plurality of connecting wires interconnect each of the output ends and each of the light emitting elements. A judging component is connected to each of the connecting wires, and judges whether or not the drive signals are being normally transmitted through the connecting wire that the judging component has selected.

Abstract: An exposing device includes a plurality of exposing units which forms a latent image, wherein exposing units includes: an exposure light source; a rotating polyhedron that reflects light from the exposure light source; a driving source that rotates the rotating polyhedron; a first detecting unit that detects the number of rotations of the driving source; a second detecting unit that detects the light from the exposure light source at a position; and a control unit that performs a first control of the driving source based on a detection signal of the first detecting unit at a start of the rotation of the rotating polyhedron and thereafter performs a second control of the driving source based on a detection signal of the second detecting unit.

Abstract: A set value output circuit includes a first output unit and a second output unit. The first output unit outputs a signal input to a first input when a first timing signal is input to a second input, and continues to output the signal until a next first timing signal is input. The second output unit outputs the signal input to a third input when the second timing signal is input to a fourth input, and continues to output the signal until a next second timing signal is input. A selection unit inputs a selected timing signal as the second timing signal to the fourth input. A control unit inputs the first timing signal to the second input, so that a set value for an image to be formed next is output during image formation using the signal output from the second output.