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Digital image watermarking technique based on wavelet transform

Author: ZhangNeng
Tutor: ZhaoZhiGang
School: Qingdao University
Course: Applied Computer Technology
Keywords: Digital Watermarking Wavelet Transform Support Vector Machine Singular Value Decomposition Geometric moments
CLC: TP309.7
Type: Master's thesis
Year: 2009
Downloads: 143
Quote: 1
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Abstract


With the rapid development of network communications, images, voice, text, video and other digital media format has been very popular in the last ten years. In this environment, the digital products can easily be copied, processing, dissemination and public. To solve this problem, the digital watermarking technology came into being. Digital watermarking technology specific information embedded in the digital products, is a new type of copy protection mechanisms. Based encryption, digital signatures and digital watermarking technology can be used to deal with the problem of digital products infringing. Media, authors, copyright and use information about the license can be embedded as a watermark to the media when needed from the media correctly detected or extracted information is used to prove the source or the original author of the ownership of the works. This paper contains the following: 1 introduces wavelet analysis theory and digital watermarking technology development overview and several main algorithm, its basic model, characteristics, classification, applications and research results for brief analysis of the comparison between the algorithms the pros and cons, summed up the problems. Proposed an improved digital watermarking method based on wavelet transform and support vector machine, select relatively difficult to be modified wavelet low frequency data as a sample point, based on the correlation between the wavelet coefficients of the image in the neighborhood, the introduction of a new image description sub and texture descriptors to extract the neighborhood pixel texture change image features and will serve as the input space training support vector machine, watermark embedding location of points based on support vector machine classification results of embedding and extracting digital watermark. The experimental results show that the algorithm of median filtering, noise adding general processing and synchronization of sexual assault are robust, the accuracy of the extracted watermark. 3 digital image watermarking scheme based on wavelet transform and singular value decomposition of the anti-geometric attacks. The program draws on the original image is mapped to the geometry within the same space moment-based image normalization technology to extract important area of ??the normalized image, the image based on human visual properties of singular value decomposition, using adaptive method The watermark information is embedded into the normalized image region. The simulation results show, the digital watermark algorithm not only has good visibility, but also has a strong resistance to conventional signal processing and geometric attacks, especially those with strong shear, rotation and scaling characteristics, robust better.

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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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