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Color image forming apparatus and color image forming method

A color image and image technology, applied in the field of in-line electrophotographic color image forming devices

Inactive Publication Date: 2011-11-30
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

[0038] A first embodiment of the present invention will be described with reference to the drawings. In the first embodiment, the deviation of the actual scanning line from the ideal scanning line that should be formed by scanning the surface of the photosensitive drum originally by using the laser beam, i.e., the scanning line parallel to the rotation axis of the photosensitive drum, Move the same amount in the same direction to eliminate. If the image type (also referred to as image attribute) is the same between color planes in the smoothing step, whether to perform the smoothing process for each color plane is uniformly determined.

[0039] That is, the scanning line switching process is performed by shifting the position of each pixel in the sub-scanning direction for each color component of the point image data to be processed, so as to eliminate the gap of the scanning line in the sub-scanning direction on the image carrier of the image forming unit. Offset. Then, typ...

no. 2 example

[0101] As a second embodiment, the following scheme can also be used. More specifically, when an attribute determination flag "ON" for all color tones is output from a determination unit for an attribute that should have the same interpolation determination result for all tones, as in the pattern image in the first embodiment, only Interpolation determination is performed with reference to this result while ignoring determination results of other attributes.

[0102] This will refer to Figure 12 be explained. Assume that all of the pattern image determination units 1229, 1231, 1233, and 1235 acquire the result that the pattern image determination flag is ON. In this case, 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 the pattern image, therefore...

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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 independent image forming units for each color component. Background technique [0002] As a color image forming apparatus such as a printer or a copier, there is known a tandem type color image forming apparatus which includes electrophotographic image forming units equal in number to color components, and consists of The toner images of the respective color components are sequentially transferred onto the printing medium. The image forming units of each color include developing units and photosensitive drums. The in-line type color image forming apparatus is known to have a plurality of factors causing a positional error between the respective color component images (this will be referred to as a registration error). [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/01H04N1/56
CPCG03G15/01H04N1/60H04N1/46
Inventor 井户阳子
Owner CANON KK