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Image forming apparatus, method for correcting shading of image forming apparatus, 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: 2021-09-14
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 apparatus, method for correcting shading of image forming apparatus, and recording medium
  • Image forming apparatus, method for correcting shading of image forming apparatus, and recording medium
  • Image forming apparatus, method for correcting shading of image forming apparatus, 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 present invention relates to an image forming apparatus, a shade correction method of the image forming apparatus, and a shade correction program. Even on a recording medium with periodic density unevenness in a non-printed state, shading correction is performed with good accuracy. The solution of the present invention is to have: a transport unit that transports the recording medium; a recording head unit that prints an image on the recording medium; a line sensor unit that optically reads the recording medium; Print a test chart on a part of it and read it with the line sensor unit. By performing frequency analysis on the image obtained by reading the recording medium in a non-printed state, the cycle of density unevenness of the recording medium is calculated, and the width based on the cycle is used as a unit. The image of the test chart is analyzed to create a shading correction table, and the image data corrected by the shading correction table is printed on a 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 Patents(China)
IPC IPC(8): B41J2/01B41J29/393
CPCB41J2/01B41J29/393B41J2029/3935H04N1/4072
Inventor 百瀬淳美
Owner KONICA MINOLTA INC