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Color image forming apparatus and color image forming method

A color image and image technology, which is applied in the field of in-line electrophotographic color image forming devices, can solve problems such as unclear determination results, and achieve the effects of avoiding unevenness and color streaks and avoiding image defects.

Inactive Publication Date: 2009-02-04
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the scan line switching process is completed in units of 1 pixel, an offset of less than 1 pixel remains in the sub-scanning direction
If these determination results are derived, the determination result of whether to perform interpolation processing on the image data becomes unclear

Method used

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  • Color image forming apparatus and color image forming method
  • Color image forming apparatus and color image forming method
  • Color image forming apparatus and color image forming method

Examples

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no. 1 example

[0036] The first embodiment of the present invention will be described with reference to the drawings. In the first embodiment, the actual scan line is offset from the ideal scan line that should be formed by scanning the surface of the photosensitive drum with a laser beam, that is, the scan line parallel to the rotation axis of the photosensitive drum, by shifting the dot image data in the opposite direction. Move the same amount in the direction to eliminate. If the image types (also referred to as image attributes) between the color planes in the smoothing step are the same, it is uniformly determined whether to perform smoothing processing on each color plane.

[0037] That is, the scan line conversion process is performed by shifting the position of each pixel in the sub-scanning direction for each color component of the dot image data to be processed, so as to eliminate the scan line in the sub-scanning direction on the image carrier of the image forming unit. Offset. Then,...

no. 2 example

[0099] As the second embodiment, the following scheme can also be used. More specifically, when the attribute determination flag "ON" for all color plates is output from the determination unit that should have the same attribute of the interpolation determination result for all color plates, as in the pattern image in the first embodiment, only Refer to the result and ignore the determination results of other attributes to perform interpolation determination.

[0100] This will be explained with reference to FIG. 12. Assume that all the pattern image determination units 1229, 1231, 1233, and 1235 acquire the result that the pattern image determination flag is ON. In this case, the interpolation determination may be made without referring to the results of the continuous grayscale image determination units 1228, 1230, 1232, and 1234. This is because if the input image is determined to be a pattern image for all color plates, all color plates include pattern images. Therefore, the s...

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Abstract

The invention provides a color image forming device and a color image forming method. According to this invention, the image attribute is determined by determining whether the image of each color component of color image data having undergone a screen process is a continuous tone image, and whether the image of each color component is a pattern image. Whether to perform an interpolation process is determined for each color component based on the attribute determination result of each color component. If it is determined that the images of all the color components are pattern images, interpolation determination results do not coincide with each other, and there is a color component determined to represent a continuous tone image, the interpolation determination result of this color component is overwritten with the interpolation determination result of the remaining color components. The interpolation process is executed in accordance with the interpolation determination result.

Description

Technical field [0001] The present invention relates to a color image forming apparatus and a color image forming method, and more particularly, to an in-line electrophotographic color image forming apparatus and a color image forming method having image forming units independent of each color component. Background technique [0002] As a color image forming apparatus (such as a printer or a copier), a tandem type color image forming apparatus is known, which includes electrophotographic image forming units equal in number to color components, and consists of the image forming unit The toner images of each color component are sequentially transferred to the printing medium. The image forming unit of each color includes a developing unit and a photosensitive drum. It is known that the in-line color image forming apparatus has multiple factors that cause positional errors (referred to as registration errors) between the respective color component images. [0003] These factors incl...

Claims

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Application Information

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IPC IPC(8): G03G15/01H04N1/56
CPCG03G15/01H04N1/60H04N1/46
Inventor 井户阳子
Owner CANON KK
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