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Image processing method, image processing apparatus and image reading apparatus

An image processing device and image processing technology, applied in image communication, electrical digital data processing, special data processing applications, etc., can solve the problem of not allowing copying of documents, etc.

Inactive Publication Date: 2010-07-07
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the pattern matching technique is used in the similarity determination, there arises a problem that even a document image formed by applying processing functions such as color conversion, scaling, and edge trimming to the read document image will be unrecognized. Desirably judged to be similar to the reference image so that copying of the document is not permitted

Method used

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

Examples

Experimental program
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Embodiment 1

[0061] FIG. 1 is a block diagram showing the configuration of an image forming apparatus 100 using an image processing apparatus according to the present invention. An image forming apparatus 100 (for example, a digital color copier, or a multifunctional peripheral having combined functions such as a printing function, and a facsimile and e-mail transmission function) includes a color image input device 1, a color image processing device 2 (image processing device) , a color image output device 3 as an image forming device, and an operation panel 4 for various kinds of operations. The image data of the RGB (R: red, G: green, B: blue) analog signals obtained when the color image input device 1 reads the document is output to the color image processing device 2, and then processed in the color image processing device 2 through pre-processing. After processing according to the set procedure, it is output to the color image output device 3 as a CMYK (C: cyan, M: magenta, Y: yellow...

Embodiment 2

[0134] The paper material of the read document is not limited to white paper, recycled paper, or light colored paper. Even in this case, when the page background clearing operation is performed on the document image, the presence or absence of writing can be judged with satisfactory accuracy. In this case, the page background clearing operation can be performed in the document matching processing section 22 . Additionally, an input tone correction section 23 may be provided at a subsequent stage of the shading correction section 21, and then a document matching processing section 22 may be provided at a subsequent stage of the input tone correction section 23, so that page background removal processing may be performed in the input tone correction section 23. implement. In the case where the page background is to be cleared from the document image, the reference format is stored in a state where the page background clearing process has been similarly performed. Additionally,...

Embodiment 3

[0143] Embodiments 1 and 2 have described structures in which the presence or absence of writing is judged based on the ratio represented by (judged pixel number M / pixel number in reference format). However, the writing judgment processing is not limited to this structure. That is, the writing judgment processing can be realized by counting the number of pixels by the document matching processing section 22 .

[0144] Figure 25 is a flowchart showing the procedure of write determination processing according to the third embodiment. The control section 227 converts the coordinate system (coordinate values) of the reference format judged to be similar to the document image into the coordinate system (coordinate values) of the document image (S141). Here, in this case, coordinate transformation can be performed on the entire reference format. Alternatively, coordinate transformations can be performed only on entry fields set in the base format.

[0145] The control section 2...

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Abstract

The file matching process part computes the feature points of the file image such as the center of gravity, then selects a plurality of feature points from the computed feature points, and then computes the hashed value based on the selected feature points. Based on the computed feature, the file matching process part judges the file image whether is the same with the previous reference format (reference image). When the judgement is the same, the file matching process part judges the write-in words whether exist in the file image, then outputs the judgement signals (indicting the judgement of the presence of the write-in words). Through judging the similarity of the file image, the admission how to handle the copy is more accurate than the traditional technology.

Description

technical field [0001] The present invention relates to: an image processing method and an image processing apparatus for performing judgment processing of whether an acquired document image is similar to a previous reference image; and an image forming apparatus and an image using the image processing apparatus Read device. Background technique [0002] A proposed method of reading a document using a scanner and then judging whether the read document image is similar to a previous reference image includes extracting keywords from an image read through OCR, and then performing pattern matching based on the extracted keywords. method; and a method of limiting the judging target file to formatted files having ruled lines, and performing pattern matching on the basis of information about ruled lines extracted from the read file. [0003] Furthermore, in another method, important documents, confidential documents, and the like are stored in advance as reference images. Then, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/00G03G21/04H04N1/60G06F17/30
Inventor 后藤牧生大平雅和
Owner SHARP KK