Abstract: An exposure device includes a plurality of light-emitting elements, a lighting driver, a first storage, a reader, a shading correction unit and a second storage. The lighting driver drives and lights up the light-emitting elements based on image data. The first storage stores light amount unevenness correction values of the respective light-emitting elements. The reader reads the light amount unevenness correction values stored in the first storage. The shading correction unit executes shading correction for the light amount unevenness correction values read by the reader. The second storage stores correction values obtained by having the shading correction unit to execute the shading correction for the light amount unevenness correction values. The lighting driver controls light power of the respective light-emitting elements based on the correction values stored in the second storage.

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 plural light emitting elements that light in turn for exposure, plural driving elements that drive each of the light emitting elements and a time changing member that changes one time period of a switching signal to switch light emitting elements driven by the driving elements among the plurality of light emitting elements in turn from a reference time, depending on an image forming speed, wherein the time changing member changes the one time period from the reference time for some of the light emitting elements during one main scan, and maintains the one time period as the reference time for the remaining light emitting elements.

Abstract: A serial signal receiving device, includes: a serial-parallel converter that converts a transmitted serial signal into a parallel signal, wherein the serialized signal is obtained by the plural signal; a storage unit that stores phase difference information indicating a phase difference among the plural signals; and a correcting unit that corrects a phase relation among the plural signals of the parallel signal output from the serial-parallel converter based on the phase difference information stored by the storage unit.

Abstract: According to an exposure device includes an exposure section, a lighting drive section, a first temperature detector and a second temperature detector. The exposure section has a plurality of light-emitting elements. The lighting drive section determines light-emitting energies of the respective light-emitting elements and drives to light the respective light-emitting elements in accordance with the determined light-emitting energies. The first temperature detector is provided in the exposure section. The second temperature detector is provided outside the exposure section. The lighting drive section determines the light-emitting energies of the respective light-emitting elements based on a temperature detected by the first temperature detector and a temperature detected by the second temperature detector.

Abstract: An exposure device includes a plurality of light-emitting elements, a lighting driver, a first storage, a reader, a shading correction unit and a second storage. The lighting driver drives and lights up the light-emitting elements based on image data. The first storage stores light amount unevenness correction values of the respective light-emitting elements. The reader reads the light amount unevenness correction values stored in the first storage. The shading correction unit executes shading correction for the light amount unevenness correction values read by the reader. The second storage stores correction values obtained by having the shading correction unit to execute the shading correction for the light amount unevenness correction values. The lighting driver controls light power of the respective light-emitting elements based on the correction values stored in the second storage.

Abstract: An exposure device includes plural light emitting elements that light in turn for exposure, plural driving elements that drive each of the light emitting elements and a time changing member that changes one time period of a switching signal to switch light emitting elements driven by the driving elements among the plurality of light emitting elements in turn from a reference time, depending on an image forming speed, wherein the time changing member changes the one time period from the reference time for some of the light emitting elements during one main scan, and maintains the one time period as the reference time for the remaining light emitting elements.

Abstract: An exposure device includes an exposure section and first and second signal output units. The exposure section has plural light emitting elements. The first signal output unit outputs to the exposure section a first signal for determining timings for starting and ending light emission of the respective light emitting elements. The second signal output unit outputs to the exposure section a second signal for determining as to whether the respective light emitting elements are caused to emit light for respective pixels. If light mission of the respective light emitting elements is stopped with respect to all pixels of one line in a main scanning direction, the first signal does not output to the exposure section for each group of one or plural light emitting elements that operate based on the common first signal.

Abstract: A serial signal receiving device, includes: a serial-parallel converter that converts a transmitted serial signal into a parallel signal, wherein the serialized signal is obtained by the plural signal; a storage unit that stores phase difference information indicating a phase difference among the plural signals; and a correcting unit that corrects a phase relation among the plural signals of the parallel signal output from the serial-parallel converter based on the phase difference information stored by the storage unit.

Abstract: An image-forming device which is equipped with an image-holding member, an exposure section provided with plural light-emitting portions arranged in a first direction, a movement section that relatively moves the exposure section and the image-holding member in a second direction that intersects with the first direction, and a light-emission control section. The light-emission control section causes the plural light-emitting portions to periodically emit light in accordance with image data representing an image that is to be formed on the image-holding member, to form the image on the image-holding member. The light-emission control section varies a light-emission period during formation of the image, so as to correct for periodic fluctuations within the image of at least one of density and magnification ratio in the second direction.

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 image forming apparatus includes an image forming unit which forms an image on a recording medium, a post-processing unit which performs a post-processing on the recording medium on which the image is formed by the image forming unit, and a post-processing controller which controls the post-processing unit according to whether an image requested by a user or a test image is formed on the recording medium. An image forming method includes, in a case where the requested image and the test image are formed on plural recording media, controlling the post-processing according to whether the requested image or the test image is formed on the recording medium, and according to the control, performing the post-processing on the recording medium on which the requested image or the test image is formed.

Abstract: An image processing apparatus includes an input section, and a screen processing section. The input section inputs image information. The screen processing section performs screen processing on the input image information with a threshold matrix. A plurality of threshold values are arranged in the threshold matrix so that if the threshold values are colored in an ascending order or descending order. The threshold matrix represents at least one selected from the group consisting of capital alphabets ‘A’ to ‘Z’, lower case alphabets ‘a’ to ‘z’ and numeric characters ‘0’ to ‘9.

Abstract: An image-forming device which is equipped with an image-holding member, an exposure section provided with plural light-emitting portions arranged in a first direction, a movement section that relatively moves the exposure section and the image-holding member in a second direction that intersects with the first direction, and a light-emission control section. The light-emission control section causes the plural light-emitting portions to periodically emit light in accordance with image data representing an image that is to be formed on the image-holding member, to form the image on the image-holding member. The light-emission control section varies a light-emission period during formation of the image, so as to correct for periodic fluctuations within the image of at least one of density and magnification ratio in the second direction.

Abstract: An image forming device includes a rotating polygon mirror and a correcting component that corrects misregistration of an image region in a predetermined direction. The correcting component carries out the correction by correcting image data used in modulating light beams reflected and deflected by any one reflecting surface among plural reflecting surfaces provided at the rotating polygon mirror, where the light beams scann a body-to-be-illuminated in the predetermined direction, correcting image data by each data unit used in modulating light beams which are reflected and deflected at the same reflecting surface, and correcting image data in accordance with a misregistration amount in the predetermined direction of the image region formed on the body-to-be-illuminated by the light beams which are reflected and deflected, where the misregistration amount is measured in advance for each reflecting surface of the rotating polygon mirror.

Abstract: An image forming apparatus includes an image forming unit which forms an image on a recording medium, a post-processing unit which performs a post-processing on the recording medium on which the image is formed by the image forming unit, and a post-processing controller which controls the post-processing unit according to whether an image requested by a user or a test image is formed on the recording medium. An image forming method includes, in a case where the requested image and the test image are formed on plural recording media, controlling the post-processing according to whether the requested image or the test image is formed on the recording medium, and according to the control, performing the post-processing on the recording medium on which the requested image or the test image is formed.