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Multiple watermarking algorithm based on wavelet transform digital image

Author: ZhangJinYan
Tutor: CuiXinChun
School: Qufu Normal University
Course: Educational Technology
Keywords: Digital Watermarking Copyright Protection Wavelet Transform Multiple watermarks
CLC: TP309.7
Type: Master's thesis
Year: 2010
Downloads: 84
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Abstract


The rapid development of Internet technology and digital information technology makes the copying of digital information, spread increasingly shortcut. On the one hand provide convenience to our lives, more and more rampant piracy and tampering of the other hand, digital works. How to protect the copyright of digital works become a hot research topic recently. The first generation of copyright protection password and digital signature technology. Cryptographic techniques to protect objects encrypted ciphertext spread, copyright protection; digital signature technology to protect information processing, will get the message digest attached to the protection of information, to prove the truthfulness of the content is protected, complete. Password and digital signature technology, there are many shortcomings in the protection of digital multimedia information but emerging copyright protection technology - digital watermark technology available to make up. The digital watermarking technology is a new kind of information hiding technology in recent years. Its core is the redundancy of the use of multimedia information, the secret information is embedded in the image, sound, video and other multimedia data to identify the copyright, password information is referred to as watermarks, embedded watermark information should not affect the use of multimedia and commercial value. At the same time be able to extract the watermark to prove copyright attribution or judgment works whether the information is destroyed. This article is a copyright protection for the image, the first carried out on the development and current status of digital watermarking briefly followed to introduce the concept of digital watermarking feature, the general model of watermark, attack, and performance evaluation of image watermarking typical algorithm. Ability to watermark robustness and watermark capacity and resistance to geometric attacks, will be a large amount of information meaningful watermark embedded in the image, digital image copyright protection. The main content and the results are as follows: (1) the use of wavelet transform to decompose the carrier image using a meaningful gray and color images as copyright watermark information, copyright information pretreatment, were embedded in the wavelet transform domain and image airspace, the visible and the invisible watermark double protection by the experimental realization of the watermark embedding, extraction and detection of digital works. (2) on the basis of the wavelet analysis, the introduction of wavelet packet transform, first vector image wavelet packet transform, then meaningful copyright watermark information scrambling encryption pretreatment, and watermark information are embedded into a vector image wavelet high-frequency and low-frequency coefficients packet transform domain, the dual watermark copyright protection. This article focuses on image works copyright protection, the proposed dual watermarking dual watermark, the wavelet the package transform domain digital image of the digital image of the wavelet transform domain. Experiments show that the algorithm has strong robustness and anti-attack capability.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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