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

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，能够解决黑白原稿误判别为等问题，达到提高判定精度的效果

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

AI Technical Summary

Problems solved by technology

[0007] However, in this case, there is a problem that if there is noise and density variation around the black characters, it will be judged as color characters, and the monochrome document will be misjudged as a color document.

Method used

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

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Experimental program
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Embodiment approach 1

[0046] figure 1 It is a block diagram illustrating the internal configuration of the image processing device according to the present invention. The image processing device according to the present invention includes a control unit 1 , an image input unit 3 , an image processing unit 5 , an image output unit 7 , and an operation unit 9 . The control unit 1 has a ROM storing a control program for controlling each part of the above-mentioned hardware, a CPU executing the control program, a RAM storing various data generated during the execution of the control program, and the like.

[0047] The image input unit 3 is means for optically reading a document image, and includes a light source for irradiating light on a document for reading, an image sensor such as a CCD (Charge Coupled Device), and the like. In the image input unit 3, the reflected light image from the document placed at the predetermined reading position is formed on the image sensor, and an analog electrical sign...

Embodiment approach 2

[0104] In Embodiment 1, the color document / monochrome document is determined by comparing the number of color character pixels, the number of color halftone dot pixels, and the number of color base pixels with thresholds set for each of them. In the case where the function of identifying the base pixels is provided, it is also possible to perform color document / black and white document determination using only the number of color character pixels and the number of color halftone dot pixels. In this case, in Figure 7 In step S24 of the flowchart shown, the pixels belonging to the color character area and the pixels belonging to the halftone dot area are counted.

[0105] Figure 9 It is a flowchart showing the processing procedure of the document type determination processing according to the second embodiment. First, the document type determination unit 53 determines whether or not the number of color character pixels is equal to or greater than the color character threshol...

Embodiment approach 3

[0110] In Embodiment 1, the judgment of color manuscript / black and white manuscript is performed by comparing the number of color character pixels, the number of color halftone dot pixels, and the number of color base pixels with the threshold value set for each of them, but it is also possible to configure For, instead of the number of color base pixels, the number of pixels belonging to the area of ​​the color paper photo (the number of pixels of the color paper photo) is compared with a threshold value (threshold value of the color paper photo) set in advance for the number of pixels of the color paper photo. In this case, in Figure 7 In step S24 of the flow chart shown, the pixels belonging to the color character area, the pixels belonging to the color dot area, and the pixels belonging to the color paper area are counted.

[0111] Figure 10 It is a flowchart showing the processing procedure of the document type determination processing according to the third embodiment...

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Abstract

The invention provides an image processing method, an image processing device, an image forming device and an image reading device. The image processing apparatus includes a counting section for counting pixels belonging to a chromatic text component and chromatic pixels belonging to a component other than the text component among pixels composing image data obtained by reading a document, a comparison section for comparing the counted numbers with respective predetermined values, a determination section for determining that the document contains a chromatic color when either one of the number of the pixels belonging to the text component and the number of the chromatic pixels belonging to the component other than the chromatic text component is not less than the corresponding predetermined value, and an image processing section for performing a process with respect to the image data in accordance with a determination result by the determination section.

Description

technical field [0001] The present invention relates to an image processing method, an image processing device, an image forming device, and an image reading device capable of improving the determination result of ACS. Background technique [0002] Digital image forming devices such as electronic copiers are being popularized in addition to conventional analog ones, and with the development of digital image processing technology, full-color digital copiers that reproduce color images with high image quality are being commercialized. Generally, full-color digital copiers use multiple toners for color reproduction. Plus, there's a black and white mode that uses only black toner. Since only black toner is used for black-and-white copying, it is less expensive and takes less time than color copying in which multiple toner images are sequentially superimposed. [0003] Therefore, an ACS (Auto Color Selection) function for determining whether a document is a color document or a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/56H04N1/46
CPCH04N1/40062H04N1/56
Inventor 后藤牧生
Owner SHARP KK