Image and text mixing digital watermark embedding and extracting method of resisting to printing and scanning

A technology that resists printing, scanning, and digital watermarking, and is used in image data processing, image data processing, instruments, etc.

Inactive Publication Date: 2014-08-13
BEIJING UNIV OF POSTS & TELECOMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing digital watermarking methods are only for text watermarking or pure image watermarking, but in many cases text and graphics are mixed together, so there is an urgent need for digital watermarking technology with mixed graphics and text

Method used

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  • Image and text mixing digital watermark embedding and extracting method of resisting to printing and scanning
  • Image and text mixing digital watermark embedding and extracting method of resisting to printing and scanning
  • Image and text mixing digital watermark embedding and extracting method of resisting to printing and scanning

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Embodiment Construction

[0026] The specific implementation flow of the method is described below. In order to describe the implementation flow more clearly, the watermark embedding process and the watermark extraction process are described in two parts below. Since there are many image watermark algorithms that are resistant to printing and scanning, there is no image watermark algorithm in the present invention. Make specific requirements, so I will not describe them in detail here:

[0027] The watermark embedding process, figure 1 is a flowchart of the process:

[0028] (1) Perform layout analysis on the graphic-text mixed image, and separate the picture and text respectively; the specific layout analysis algorithm is described as follows:

[0029] a) Read the graphic-text mixed image that needs to be embedded with watermark, and generate a two-dimensional array pnBinary according to the image information. The length of the array is the same as the number of pixels on the long side of the picture...

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Abstract

The invention provides an image and text mixing digital watermark embedding and extracting method. According to the method, watermarks can be embedded in single images and single pieces of text information, and watermarks can also be embedded in information containing images and text in a mixing mode. According to the method, a digital watermark algorithm based on a spatial domain is provided, and high robustness is achieved according to resistance to printing and scanning attacks. In addition, according to the method, the concept of an adjustable variable is provided, sequential embedding and extracting of digital watermark information are achieved, and high watermark capacity is achieved.

Description

technical field [0001] The invention relates to the fields of computer information security and copyright protection, in particular to a digital watermark embedding and extraction algorithm resistant to printing and scanning, which mixes images and texts. Background technique [0002] In recent years, the rapid development of the network has effectively improved the sharing and dissemination of information, but the problems of information security and copyright protection have become more and more serious. Digital watermarking technology can provide information hiding and copyright protection functions. Digital watermarking technology refers to the use of signal processing technology to embed hidden marks in digital multimedia data. This mark is usually invisible and can only be extracted by a special detector or reader. Compared with the direct copy of the original document, the printed and scanned document has great changes from the original version, so it is more difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 张茹刘建毅陈康康周飞朱建尧宋玲娓钮心忻
Owner BEIJING UNIV OF POSTS & TELECOMM
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