Abstract: The image recording apparatus includes: a recording head which has a plurality of recording elements; a conveyance device which causes the recording head and a recording medium to move relatively to each other by conveying at least one of the recording head and the recording medium; a characteristic information acquisition device which acquires information that indicates recording characteristics of the recording elements, the recording characteristics including recording position errors of the recording elements and errors in volume of droplets ejected from the recording elements; a correction range setting device which sets N correction recording elements (where N is an integer larger than 1) for use in correction of output density, from among the plurality of recording elements; a correction coefficient specification device which specifies density correction coefficients for the N correction recording elements according to correction conditions including conditions where a differential coefficient at a fre

Abstract: The image recording apparatus records an image by ejecting ink onto a recording medium from a print head having a plurality of nozzles while moving the print head and the recording medium relatively to each other. The image recording apparatus comprises: a memory device which stores reference density characteristics obtained by measuring a prescribed test pattern formed on the recording medium by means of the nozzles; a density characteristic acquiring device which acquires density characteristics of print areas corresponding to the nozzles; a compensation device which compensates a droplet ejection rate signal of each of the nozzles so that the density characteristics acquired by the density characteristic acquiring device coincide with the reference density characteristics; and a quantization device which quantizes each droplet ejection rate signal compensated by the compensation device.

Abstract: An image forming apparatus which forms a primary image on an intermediate transfer body and then transfers the primary image onto a recording medium, has: a movement device which moves the intermediate transfer body in a movement direction; a recess-projection forming device which forms a recess-projection shape in an image forming surface of the intermediate transfer body; a droplet ejection device which is provided on a downstream side of the recess-projection forming device in terms of the movement direction and ejects droplets of ink onto the image forming surface of the intermediate transfer body in which the recess-projection shape has been formed, to form the primary image; and a transfer recording device which is provided on a downstream side of the droplet ejection device in terms of the movement direction and applies pressure to at least one of the intermediate transfer body and the recording medium in a state where the recording medium makes contact with the primary image formed on the image formin

Abstract: The image forming method is for forming an image on an image formation body by using an ink liquid including a coloring material and an aggregation treatment agent including a component that causes the coloring material to aggregate. The image forming method includes: an aggregation treatment layer formation step of forming, on the image formation body, a semisolid aggregation treatment layer that includes the aggregation treatment agent and has a moisture content ratio not more than 56%; an ink droplet deposition step of ejecting droplets of the ink liquid and depositing the droplets of the ink liquid onto the image formation body where the aggregation treatment layer has been formed; and a solvent removal step of removing a liquid solvent present on the image formation body after the ink droplet deposition step.

Abstract: The image recording apparatus comprises: a recording head which has a plurality of recording elements; a conveyance device which causes the recording head and a recording medium to move relatively to each other by conveying at least one of the recording head and the recording medium; a characteristics information acquisition device which acquires information that indicates recording characteristics of the recording elements; a correction object recording element specification device which specifies a correction object recording element from among the plurality of recording elements, a density non-uniformity caused by the recording characteristic of the correction object recording element being corrected; a correction range setting device which sets N correction recording elements (where N is an integer larger than 1) from among the plurality of recording elements, the N correction recording elements being used in correction of output density; a correction coefficient specification device which calculates the

Abstract: The image processing method comprises the steps of: obtaining a distance between an ejection surface of a liquid ejection head in which a plurality of liquid droplet ejection ports are formed, and a recording surface onto which liquid droplets ejected from the liquid droplet ejection ports are deposited; identifying an amount of depositing position displacement of the liquid droplet ejected from each of the liquid droplet ejection ports on the recording surface, according to the distance; and generating droplet ejection arrangement data by correcting image data according to the identified amount of depositing position displacement and performing a halftoning process of the corrected image data.

Abstract: The image forming apparatus forms an image on a prescribed recording medium by carrying out digital halftoning using a threshold value matrix. The image forming apparatus comprises: a plurality of nozzles which eject ink toward the recording medium to form an image; an ejection characteristics determination device which determines ejection characteristics of each of the nozzles; and a threshold value correction device which performs first threshold value correction to reduce density non-uniformity occurring in the image due to error in the ejection characteristics of the nozzles, by correcting the threshold value matrix according to the error in the ejection characteristics of the nozzles, and performs second threshold value correction to reduce granularity in the image by correcting the threshold value matrix having undergone the first threshold value correction, according to threshold values in the threshold value matrix.

Abstract: The image forming apparatus comprises: a conveyance device which performs relative movement of an ejection head and a recording medium by conveying at least one of the ejection head and the recording medium in a uniform relative movement direction; the ejection head which includes ink ejection ports two-dimensionally arranged, the ejection head performing an ink ejection operation of ejecting ink droplets through the ink ejection ports toward the recording medium in conjunction with the relative movement performed by the conveyance device so as to compose a line-shaped dot row in a main scanning direction substantially perpendicular to the relative movement direction from dots formed by the ink droplets deposited on the recording medium, adjacent two of the dots being arranged to overlap at least partially with each other, one of pairs of adjacent two of the ink ejection ports being a maximum-landing-time-difference pair where a landing time difference between the adjacent two of the dots arranged in the line

Abstract: The image recording apparatus includes: a recording head which has a plurality of recording elements; a conveyance device which causes the recording head and a recording medium to move relatively to each other by conveying at least one of the recording head and the recording medium; a characteristic information acquisition device which acquires information that indicates recording characteristics of the recording elements, the recording characteristics including recording position errors of the recording elements and errors in volume of droplets ejected from the recording elements; a correction range setting device which sets N correction recording elements (where N is an integer larger than 1) for use in correction of output density, from among the plurality of recording elements; a correction coefficient specification device which specifies density correction coefficients for the N correction recording elements according to correction conditions including conditions where a differential coefficient at a fre

Abstract: The image processing method converts an input image having multiple tones into an image having fewer tones than the input image, for image recording by a recording head including a plurality of recording elements arranged in a prescribed direction, the method comprising the steps of: quantizing pixel values of pixels of the input image in a processing direction which is set to a direction substantially parallel to a relative conveyance direction of a recording medium with respect to the recording elements when recording onto the recording medium is performed by means of the recording elements, the pixel value for a pixel under processing being quantized according to a result of a comparison between the pixel value for the pixel under processing and a threshold value for the pixel under processing; diffusing an error with respect to the pixel under processing caused by quantizing the pixel value for the pixel under processing, into an unprocessed pixel in a periphery of the pixel under processing; and determin

Abstract: The image processing method comprises the steps of: obtaining a distance between an ejection surface of a liquid ejection head in which a plurality of liquid droplet ejection ports are formed, and a recording surface onto which liquid droplets ejected from the liquid droplet ejection ports are deposited; identifying an amount of depositing position displacement of the liquid droplet ejected from each of the liquid droplet ejection ports on the recording surface, according to the distance; and generating droplet ejection arrangement data by correcting image data according to the identified amount of depositing position displacement and performing a halftoning process of the corrected image data.

Abstract: The image recording apparatus comprises: a recording head which has a plurality of recording elements; a conveyance device which causes the recording head and a recording medium to move relatively to each other by conveying at least one of the recording head and the recording medium; a characteristics information acquisition device which acquires information that indicates recording characteristics of the recording elements; a correction object recording element specification device which specifies a correction object recording element from among the plurality of recording elements, a density non-uniformity caused by the recording characteristic of the correction object recording element being corrected; a correction range setting device which sets N correction recording elements (where N is an integer larger than 1) from among the plurality of recording elements, the N correction recording elements being used in correction of output density; a correction coefficient specification device which calculates the

Abstract: The image forming apparatus forms an image on a prescribed recording medium by carrying out digital halftoning using a threshold value matrix. The image forming apparatus comprises: a plurality of nozzles which eject ink toward the recording medium to form an image; an ejection characteristics determination device which determines ejection characteristics of each of the nozzles; and a threshold value correction device which performs first threshold value correction to reduce density non-uniformity occurring in the image due to error in the ejection characteristics of the nozzles, by correcting the threshold value matrix according to the error in the ejection characteristics of the nozzles, and performs second threshold value correction to reduce granularity in the image by correcting the threshold value matrix having undergone the first threshold value correction, according to threshold values in the threshold value matrix.

Abstract: The image recording apparatus records an image by ejecting ink onto a recording medium from a print head having a plurality of nozzles while moving the print head and the recording medium relatively to each other. The image recording apparatus comprises: a memory device which stores reference density characteristics obtained by measuring a prescribed test pattern formed on the recording medium by means of the nozzles; a density characteristic acquiring device which acquires density characteristics of print areas corresponding to the nozzles; a compensation device which compensates a droplet ejection rate signal of each of the nozzles so that the density characteristics acquired by the density characteristic acquiring device coincide with the reference density characteristics; and a quantization device which quantizes each droplet ejection rate signal compensated by the compensation device.

Abstract: The ink ejection apparatus comprises: a plurality of ink ejection heads which are provided corresponding to a plurality of colors to record a color image onto a recording medium by performing one relative movement with respect to the recording medium, the ink ejection heads having a plurality of nozzles for ejecting respective inks of the colors toward the recording medium; and a dot arrangement setting device which sets each of dot arrangements of the inks of the respective colors on the recording medium according to a prescribed stripe pattern, wherein among absolute values of stripe angles formed by the inks of the colors with respect to a direction of the relative movement of the recording medium, the absolute value of the stripe angle formed by the ink of yellow is set to be a minimum.

Abstract: The image forming apparatus comprises: a conveyance device which performs relative movement of an ejection head and a recording medium by conveying at least one of the ejection head and the recording medium in a uniform relative movement direction; the ejection head which includes ink ejection ports two-dimensionally arranged, the ejection head performing an ink ejection operation of ejecting ink droplets through the ink ejection ports toward the recording medium in conjunction with the relative movement performed by the conveyance device so as to compose a line-shaped dot row in a main scanning direction substantially perpendicular to the relative movement direction from dots formed by the ink droplets deposited on the recording medium, adjacent two of the dots being arranged to overlap at least partially with each other, one of pairs of adjacent two of the ink ejection ports being a maximum-landing-time-difference pair where a landing time difference between the adjacent two of the dots arranged in the line