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 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: 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 device for measuring a length of a recoding material, includes: a rotating body that rotates in contact with a recording material which is transported; a length measuring unit that measures a length of the recording material based on a rotation of the rotating unit; a detecting unit that detects at least one of a rotation and an oblique advance of the recording material; and a correcting unit that corrects a value measured by the length measuring unit based on an output of the detecting unit.

Abstract: A measuring device of a length of a recording material includes: a rotary unit that rotates while coming into contact with the recording material; a pulse signal output unit that outputs a pulse signal in response to a rotation angle of the rotary unit; first and second detection units that detect the recording material; and a calculation unit that calculates a length of the recording material. The calculation unit calculates a piece of the length of the recording material corresponding to a time below pulse interval of the pulse signal and then calculates the total length in the transport direction of the recording material.

Abstract: There is provided an image processing apparatus having an image segmentation unit that divides image formation into image areas in a first direction, a random number memory that stores random numbers, a reference position determination unit that determines a reference position so as to vary in a second direction perpendicular to the first direction, a pixel determination unit that determines a pixel as a target to be subjected to correction processing of pixel insertion into or pixel reduction from each of the image areas, for the each of the image areas, according to the stored random numbers and the determined reference position, among pixels in the each of the image areas, and an image width change unit that performs the correction processing on the determined pixel to change an image width of the image information in the first direction.

Abstract: A recording material moving device comprises: a position adjuster that moves a recording material in a direction which is parallel to a recording surface of the recording material and orthogonal to a transporting direction, in an upstream side of a recording position along the transport direction of the recording material; a reference position specifying unit that specifies a reference position; a determination unit that determines whether a range of a predetermined width centered on the reference position exceeds a movable range of the recording material within which the recording material can be moved by the position adjuster; and a controller that causes, if the determination unit determines that the movable range is not exceeded, the position adjuster to sequentially move the recording material within the movable range of the predetermined width centered on the reference position each time a condition for moving the recording material is satisfied.

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 measuring device of a length of a recording material includes: a rotary unit that rotates while coming into contact with the recording material; a pulse signal output unit that outputs a pulse signal in response to a rotation angle of the rotary unit; first and second detection unit that detect the recording material; and a calculation unit that calculates a length of the recording material. The calculation unit calculates a peace of the length of the recording material corresponding to a time below pulse interval of the pulse signal and then calculates the total length in the transport direction of the recording material.

Abstract: An image forming apparatus includes an image forming unit that forms an image on a recording medium within a predetermined width for image formation, a deviation amount obtaining unit that obtains an amount of a deviation formed on a recording sheet by the image forming unit, a correcting unit that corrects image data of an image to be formed by the image forming unit, on the basis of the obtained amount of a deviation, a deficiency amount calculating unit that calculates an amount of a deficiency of an image which occurs in an area beyond the predetermined width for image formation as a result of the correction by the correcting unit, and the correcting unit is further configured to correct image data of an image to be formed by the image forming unit, on the basis of the calculated amount of a deficiency.

Abstract: An image processing device includes; an image segmentation unit that divides an image information set into a plurality of image areas, the image information set forming a plurality of lines each constituted of colored pixels arrayed in a first direction, and the image information set expressing gradations forming an image as a number of the colored pixels existing in a predetermined image area; an image area shift unit that shifts the predetermined image area among the plurality of image areas in a second direction different from the first direction, relative to an image area substantially contiguous to the predetermined image area; and a pixel replacement unit that replaces the colored pixels forming part of each of the lines and existing within a predetermined distance range from the boundary, with at least one of the colored pixels intervening between the lines.

Abstract: A device for measuring a length of a recoding material, includes: a rotating body that rotates in contact with a recording material which is transported; a length measuring unit that measures a length of the recording material based on a rotation of the rotating unit; a detecting unit that detects at least one of a rotation and an oblique advance of the recording material; and a correcting unit that corrects a value measured by the length measuring unit based on an output of the detecting unit.

Abstract: A recording sheet moving device includes: a moving unit that moves a recording sheet; a recording sheet specifying unit that specifies a length in the transport direction and a weight per unit area of the recording sheet; a first memory configured to record, for each of plural recording sheets, a threshold for a length in the transport direction in association with a weight per unit area; and a movement control unit that retrieves a threshold for a length on the basis of the specified weight per unit area from the first memory, and compares the retrieved threshold for a length and the specified length, to determine whether to cause the moving unit to move the recording sheet, and if it is determined that the recording sheet should be moved, causes the moving unit to move the recording sheet.

Abstract: An image forming apparatus includes a screen processing part that performs a screen processing on image data, a correction processing part that divides the image data subjected to the screen processing into plural regions, determines a correction parameter for each of the regions in response to a characteristic of the screen processing, and performs the correction processing, and an image formation part that forms an image based on the image data subjected to correction processing.

Abstract: An apparatus for measuring a length of a recording material, includes: a rotating member that rotates while contacting a conveyed recording material; a detecting section that detects a rotation amount of the rotating member; an information obtaining section that obtains at least one of information of an image formed on the recording material and information of the recording material; and a calculating section that calculates a length of the recording material in a direction of the conveyance, based on an output from the detecting section and the information obtained by the information obtaining section.