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Transform domain digital watermarking algorithm based research

Author: SongXiaoTao
Tutor: FangWangSheng
School: Jiangxi University of Technology
Course: Applied Computer Technology
Keywords: Transform Domain Orthogonal Walsh code Human visual system DWT SVD
CLC: TP309.7
Type: Master's thesis
Year: 2010
Downloads: 161
Quote: 0
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Abstract


Digital watermarking has a history of more than ten years, the media division of the watermark annexed, which can mainly be divided into three categories: image watermarking, audio watermarking, video watermarking. Audio and video watermark image watermarking algorithm, it can be easily applied to the audio and video watermark transform domain watermarking algorithm is the core of the current image watermarking algorithm, Therefore, we have chosen to transform domain watermarking algorithm as an object of study. In this paper, the following three watermarking algorithm: spread spectrum watermarking algorithm using orthogonal Walsh code modulation. The algorithm is based on the CDMA principle, the use of three mutually orthogonal Walsh code watermark information is modulated at the same time, and then embedded into the frequency coefficients of the DCT domain of the carrier image. The essence of this algorithm is the use of the reliability of the communication channel of the multi-channel embedded watermark, to enhance the weakened by the noise can be varied. The simulation results show that, compared with the usual direct spread spectrum technology, digital watermarking system, the performance of the system transparency, robustness well. However, the watermark information is used in the pseudo-random sequence, the watermark embedded in a relatively small capacity. Combined the wavelet zerotree wavelet algorithm with HVS watermarking algorithms. The algorithm is based on wavelet transform, the beginning of the watermark image scrambling and expansion watermark sequence signal, and then embedded into the wavelet coefficients of a group elected by the importance of embedding strength is visible by the wavelet domain critical error JND threshold decision . Simulation results show that this algorithm is a good balance between invisibility and robustness, embedded position selection draws on the idea of ??zero-tree coding, significant savings in the process of embedding watermark spent time. This algorithm uses binary image as watermark information, watermark capacity, but still belongs to the a simple transform domain watermarking algorithm of geometric attack sensitive. Digital watermarking algorithm combined SVD and wavelet transform. The algorithm of the singular value decomposition and wavelet transform combining organic. The Arnold transformation treat embedding binary watermark conducted scrambling process, to eliminate the correlation between the pixels, to enhance the anti-attack performance of the algorithm. Embedding watermark scrambling singular value embedded in the the IF area after the image more than 3 layers wavelet transform and decide according to the the IF region and the nature of the watermark block embedded in the strength and position. Extraction of the watermark, take full advantage of the binary nature of the binary image watermark. The simulation results show that the proposed algorithm is not only watermarking capacity, transparency, and has strong robustness of common watermark attacks processing, crop, rotate geometric attacks also has good sound.

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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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