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Image forming device, shading correction method for image forming device, and recording medium

A recording medium, shading correction technology, applied in image communication, printing devices, printing and other directions, can solve problems such as density effects

Active Publication Date: 2020-05-26
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the case where the recording medium has density variation, in the conventional density correction processing, the density of the test pattern may be affected by the density variation of the recording medium.

Method used

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  • Image forming device, shading correction method for image forming device, and recording medium
  • Image forming device, shading correction method for image forming device, and recording medium
  • Image forming device, shading correction method for image forming device, and recording medium

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Embodiment Construction

[0124] Hereinafter, modes for implementing the present invention will be described in detail with reference to the drawings. However, the scope of the present invention is not limited to the illustrated examples. It should be noted that, in the following description, elements having the same function and structure are assigned the same symbols, and descriptions thereof are omitted. In addition, in the following description, "image data" refers to the data of the entire image formed on one recording medium, for example, and "pixel" refers to the amount of one dot constituting the "image data". data.

[0125] The inkjet recording apparatus according to this embodiment calculates the cycle of density unevenness depending on the recording medium itself, and makes the unit of the width of the table for shading correction wider than the density uneven cycle. At this time, the inkjet recording apparatus calculates the optimum density detection range by performing frequency analysis...

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Abstract

The invention relates to an image forming device, a shading correction method for the image forming device, and a recording medium. Accurate shading correction is performed even on a recording mediumin which cyclic density unevenness exists in a non-printing state. The image forming device includes: a conveyance unit that conveys a recording medium; recording head units that print an image on therecording medium; a line sensor unit that optically reads the recording medium; and a control unit that prints a test chart on a part of the recording medium, reads the test chart by the line sensorunit, performs frequency analysis on an image obtained by reading the recording medium in the non-printing state to calculate a cycle of density unevenness of the recording medium, analyzes an image of the test chart in units of width based on the cycle, creates a shading correction table, and prints image data corrected on the basis of the shading correction table on the recording medium.

Description

technical field [0001] The present invention relates to an image forming apparatus, a shade correction method and a shade correction program for the image forming apparatus. Background technique [0002] In printing with an inkjet printer, density unevenness occurs due to the difference in liquid volume between inkjet heads or the difference in ink droplet landing accuracy. Concentration unevenness occurs. Therefore, in order to reduce density unevenness during printing, the inkjet printer performs density correction processing such as shading correction. In the shading correction, an inkjet printer prints a test chart on a recording medium, optically scans the test chart, and performs shading correction for every arbitrary width. [0003] However, in the case where the recording medium has density variation, the density of the test pattern may be affected by the density variation of the recording medium in conventional density correction processing. Claim 1 of Patent Doc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/01B41J29/393
CPCB41J2/01B41J29/393B41J2029/3935H04N1/4072
Inventor 百瀬淳美
Owner KONICA MINOLTA INC