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The Blind Watermarking Algorithm Research Based on JND Threshold and Wavelet Domain

Author: LiJing
Tutor: ChangJianPing
School: Nanjing University of Aeronautics and Astronautics
Course: Signal and Information Processing
Keywords: Digital watermarking Blind watermarking Wavelet transform JND technology JPEG2000 Arnold transform
CLC: TP309.7
Type: Master's thesis
Year: 2011
Downloads: 93
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Abstract


Wavelet transform is core technology of the latest image compression standard JPEG2000, So many researchers focus theirs eyes on the blind digital watermarking algorithm based on wavelet transform. However, the most these watermarking algorithms can’t against all the attacks, but only one particular attack, and these algorithms have poor robustness. Therefore, many analyses were done and fully studies about JND technique were researched in this paper. And two blind watermarking algorithms which have good robust performances are proposed. The JND technique and fractal technology are used in the algorithms which are described as follows:1. Through many researches and analyses aiming at two-dimension discrete wavelet transform, the triple wavelet decomposition is realized by the simulation and the wavelet coefficients’characteristics are analyzed in theory.2. A blind watermarking algorithm based on the wavelet domain and JND threshold is proposed. It chooses embedding strength in the significant wavelet coefficients in adaptive through combining peculiar multi-resolution analysis in wavelet domain and JND technique. The proposed algorithm can greatly improve the embedding capacity while keeping invisibility of watermark. It has successfully realized the blind detection. Some common attacks especially JPEG2000 compression were proceeded on the watermarked image. The experimental results demonstrate that the algorithm has more robustness than the algorithm called a gray image blind watermarking algorithm based on DWT domain. This algorithm is more extensive, and can be used as a foundation of colored watermarking embedding.3. A blind watermarking algorithm based on wavelet domain and fractal technology is proposed. The algorithm adopts the improved Arnold transform in pretreatment to improve the safety. It embeds the watermark through changing the fractal parameters and selecting the area with relatively rich textures to finish the fractal coding. The results show that the algorithm can effectively balance the ability between invisible and robustness. Compared to the algorithm which is called digital watermark based on fractal technology in multi-wavelet domain, the proposed algorithm has not only realized the blind detection but also has more robustness against the various attacks.

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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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