Method for detecting file scanned image rotating angle and pantographic ratio

A scaling and image rotation technology, applied in the field of image processing, can solve the problems of improper dissemination of copied documents, difficulty in ruler identification and detection, and damage to the visual effect of documents, achieving strong security, strong anti-interference ability, and improved accuracy. Effect

Active Publication Date: 2006-05-24
BEIJING FOUNDER ELECTRONICS CO LTD +1
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AI Technical Summary

Problems solved by technology

But there is a big flaw in this method, if the illegal copier covers it with an opaque object, the ruler will lose its effect completely
On the other hand, since printing, scanning, copying and other processes add inestimable random noise to the original document, the scale attached to the scan is also often affected, making the identification and detection of the scale difficult
Repeatedly placing multiple rulers in different places on the document can solve this problem to a certain extent, but it will destroy the visual effect of the document, and as long as the ruler is visible, illegal copiers will always find a way to remove it, and then carry out illegal Copying and Improper Distribution of Documents

Method used

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  • Method for detecting file scanned image rotating angle and pantographic ratio
  • Method for detecting file scanned image rotating angle and pantographic ratio
  • Method for detecting file scanned image rotating angle and pantographic ratio

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Embodiment Construction

[0026] Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:

[0027] As shown in Figure 5, a method for detecting the rotation angle and zoom ratio of a scanned document image includes the following steps:

[0028] (1) Generate a shading background unit and implant scale information;

[0029] The method described in the present invention is to automatically print a layer of shading background at the bottom of the document when printing the content of the document, the shading background is composed of a series of dots, and then implant different Visible ruler information. In this embodiment, the specific method is: a set of dots with a certain grayscale can be generated by amplitude modulation, frequency modulation, or self-defined methods to form a shading background unit. In order not to affect the visual effect of the normal document content, the gray of the shading background The intensity value range is 5% to 15...

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Abstract

In current technique, obvious symbol as scaleplate is setup in file in order to raise image recognition of file scanned. But, if copier covers the scaleplate, the scaleplate is out of action. In addition, random noise is added to original file caused by printing, scanning and copying processes, and attached scaleplate is also affected. Thus, recognizing and testing scaleplate is becoming difficult. The disclosed method implants shading composed of dots at bottom of content of file. Specific net dotsimplanted in shading is as scaleplate. Recognizing net dots as scaleplate calculates angle of rotation and scaling of scanned image. Features are: high security and interference killing feature since invisible information of scaleplate.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a method for detecting the rotation angle and scaling ratio of a scanned document image. Background technique [0002] With the rapid expansion of the application field of computer image processing technology, text recognition, image recognition, image restoration, digital watermarking and other processing have become very important technical means, and most of the objects they process are digital images obtained by scanning documents. However, during the document scanning process, due to the influence of subjective or objective factors, the scanned image is usually rotated at a certain angle; on the other hand, if the resolution used when scanning the document is different from the resolution used for printing the original document, It can also cause scaling of the scanned image. In addition, with the development of information hiding technology, people oft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/20G06K9/46
Inventor 史文哲亓文法杨斌
Owner BEIJING FOUNDER ELECTRONICS CO LTD
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