Image processing apparatus, image forming apparatus, and image processing method

一种图像处理装置、图像处理的技术，应用在图像通信、电气元件等方向，能够解决不能进一步区分网点区域、图像质量劣化等问题

Inactive Publication Date: 2006-11-15
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the method of Japanese Patent Laid-Open No. 8-251406, the halftone dot area cannot be further distinguished and judged, so the same process is performed on all the halftone dot areas in the original document, so that the image quality deteriorates depending on the type of original document.

Method used

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  • Image processing apparatus, image forming apparatus, and image processing method
  • Image processing apparatus, image forming apparatus, and image processing method
  • Image processing apparatus, image forming apparatus, and image processing method

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Embodiment Construction

[0033] One embodiment of the present invention will be described below with reference to the drawings. First, refer to figure 2 A schematic configuration of an image forming apparatus to which the image processing apparatus of this embodiment is applied will be described.

[0034] Such as figure 1 As shown, the image forming apparatus of this embodiment is composed of a color image input device 10 , an image processing device 20 , a color image output device 40 , and an operation panel 50 . The operation panel 50 is composed of setting buttons or numeric keys for setting the operation mode of the image forming apparatus (for example, a digital copying machine), and a display unit composed of a liquid crystal display or the like.

[0035] The color image input device 10 is composed of, for example, a scanning unit, and reads a reflected light image from a document into a CCD (Charge Coupled Device) as RGB (R: red, G: green, B: blue) analog signals.

[0036] The color image ...

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PUM

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Abstract

As the color conversion process for image data of an RGB signal, a color correction section 26 performs a color correction process, and a black generation and under color removal section 27 performs a black generation and under color removal process. In the color conversion process, the color correction section 26 and the black generation and under color removal section 27 are supplied with a halftone frequency recognized by a halftone frequency recognition section 23 . The color correction section 26 and the black generation and under color removal section 27 change the process based upon the halftone frequency. As a result, an image processing apparatus is realized in which improved image quality can be produced by an optimum image process that is performed on an image containing a halftone area depending upon the halftone frequency of the halftone area so that image quality is improved.

Description

technical field [0001] The present invention relates to an image processing device for performing image processing on image data for printing, and more particularly to an image processing device for performing high-quality color conversion of a printed matter composed of halftone dots. Background technique [0002] In image forming apparatuses such as copiers and printers employing electrophotography or inkjet methods, full-color digital copiers and multi-function machines that reproduce color images with high quality have been commercialized along with advances in digital image processing technology. [0003] With regard to document images copied by these image forming apparatuses, there are document images of characters, line drawings, photographs, or a combination thereof. Therefore, in order to obtain a good reproduced image in these originals, it is necessary to perform image processing on these originals. [0004] In such an image forming apparatus, various operation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/60H04N1/40H04N1/56
CPCH04N1/40075H04N1/60
Inventor 后藤牧生南雅范
Owner SHARP KK
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