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Anti-print-scanning text image digital watermarking method

A technology that is resistant to printing, scanning, and text images. It is applied in the field of image processing. It can solve the problems of difficult balance between watermark invisibility and robustness, difficulty in resisting printing and scanning attacks, and low watermark capacity, so as to achieve good invisibility , more accurate extraction, and high watermark capacity

Pending Publication Date: 2021-04-13
山西西电信息技术研究院有限公司
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Problems solved by technology

The main problem to be solved by the present invention is that the existing text watermarking method is difficult to resist printing and scanning attacks, the watermarking capacity is low, and the implementation is complicated, especially the problem that it is difficult to obtain a balance between the invisibility and robustness of the watermark

Method used

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  • Anti-print-scanning text image digital watermarking method
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  • Anti-print-scanning text image digital watermarking method

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Embodiment Construction

[0047] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0048]Refer to attached figure 1 The specific steps of the method of the present invention are as follows.

[0049] Step 1, text line recognition.

[0050] For each pixel row of the carrier image, count the black pixels and calculate the row width of the pixel row, and calculate the ratio of the total number of black pixels to the pixel row width. If the ratio is 0, it is determined that the row is a blank pixel row, and the ratio is not 0. Then it is determined that the row is a text pixel row. Traverse all pixel lines from top to bottom. If the current pixel line is a text pixel line and the previous pixel line is a blank pixel line, then it is determined that the current pixel line is the upper boundary of the text line. If the current pixel line is a blank pixel line and the previous pixel line is a text line. pixel line, it is determined that the previous pix...

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Abstract

The invention discloses an anti-print-scanning text image digital watermarking method. The method comprises the following specific steps: (1) text line identification; (2) text character recognition; (3) watermark information preprocessing; (4) watermark embedding pretreatment; (5) watermark embedding; (6) image correction; (7) watermark extraction pretreatment; and (8) extracting the watermark. The text watermarking method solves the problems that the redundancy is low and the watermark is not strong in resistance to printing and scanning attacks when the watermark is embedded in the text watermarking method. According to the method, the advantages of an airspace text watermarking algorithm are utilized, the robustness to printing scanning attacks is high, the invisibility of watermarks is good, calculation is simple, and the watermark embedding capacity is high.

Description

technical field [0001] The invention belongs to the technical field of image processing, and further relates to a digital watermarking method for anti-printing and scanning text images in the technical field of information hiding. The invention can be used to embed watermark information into text images while printing / printing output images, and extract the embedded watermark information by scanning the printed images, so as to realize the copyright protection of printing and printed products. Background technique [0002] In the Internet age, copyright infringement of paper books and other paper materials is becoming more and more serious, which seriously damages the legitimate rights and interests of authors and publishers. Text-based digital watermarking technology can hide group or individual identification information in electronic or paper texts in a specific way, and these information will not be recognized by human eyes, so as to realize the copyright protection of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T5/10G06T5/30G06T7/13
CPCG06T1/005G06T5/10G06T5/30G06T2201/0065G06T2207/20052G06T2207/20061G06T2207/20064G06T2207/30176G06T7/13
Inventor 王志明张烜裴春红
Owner 山西西电信息技术研究院有限公司
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