Character pitch encoding-based dual-watermark embedded text watermarking method

A character spacing and watermark embedding technology, which is applied in the direction of electronic digital data processing, special data processing applications, program/content distribution protection, etc., to achieve good concealment and improve robustness

Inactive Publication Date: 2013-04-17
UNIV OF SHANGHAI FOR SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the language of most domestic documents is Chinese, the application of this method still has great limitations

Method used

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  • Character pitch encoding-based dual-watermark embedded text watermarking method
  • Character pitch encoding-based dual-watermark embedded text watermarking method
  • Character pitch encoding-based dual-watermark embedded text watermarking method

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Embodiment Construction

[0029] Such as figure 1 The flow chart of the watermark embedding process in the text watermarking method based on the double watermark embedding of character spacing coding is shown. Read the digital watermark information that needs to be embedded M (such as copyright information) and the key D , convert the effective watermark information to be hidden into a binary sequence M =m 1 m 2 m 3 ... m g ,in m s ∈{0,1},1 ≤s≤g , converting the key to a binary sequence D=d 1 d 2 d 3 ... d p ,in d s ∈{0,1},1 ≤s≤p .

[0030] The binary sequence of the watermark and the key is cyclically modulo-encrypted to obtain a new encrypted watermark sequence Q=q 1 q 2 q 3 ... q r ,in q s ∈{0,1},1 ≤s≤r ,in,

[0031]

[0032] Table 1

[0033]

[0034] Perform Hamming encoding on the encrypted watermark information, when i mod4 = When 0 (every 4 bits of data) add a supervision code according to Table 1 to generate a new binary sequence H=h 1 h 2 ...

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Abstract

The invention relates to a character pitch encoding-based dual-watermark embedded text watermarking method, comprising the following steps of: converting watermark information M and a key D, which are required to be hidden, into a binary sequence, circularly executing modulus to get an encrypted binary sequence, adding error-correcting codes for the to-be-embedded watermark information, and finally embedding dual watermarks and synchronization information of the watermarks by encoding the attribute of a text object without page modification and encoding a character pitch. With the method, the text content cannot be changed, the watermark information is hidden well, and the method has the characteristics of high robustness and high capacity. By extracting the embedded watermark information, transmission and modification of a document can be controlled effectively, and whether the document is modified can be judged, and finally, the aims of digital copyright protection, data integrity authentication and safe covert communication for the text document are achieved.

Description

technical field [0001] The invention relates to a text watermarking technology, in particular to a text watermarking method based on double watermark embedding of character spacing coding. Background technique [0002] Digital watermarking, as an important technology for intellectual property protection and information security maintenance, has developed rapidly in recent years. The basic principle of digital watermarking is to embed hidden digital watermark information with certain significance in the carrier of multimedia data (such as image, text, audio and video, etc.), and the embedded watermark information will not affect the use of the original multimedia carrier data, and Watermark information is transmitted and used together with the original carrier data. After embedding the watermark information, a specific watermark detection device can be used to extract the embedded watermark information, which can be applied to copyright protection, tampering location, data i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/16G06F17/22
Inventor 陈青牛月蕊周黎敏张宇飞傅哲封少坤连攀攀
Owner UNIV OF SHANGHAI FOR SCI & TECH
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