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Research on Video Watermarking Scheme Based on Local Pseudo-Zernike Moments

Author: ZuoChangHao
Tutor: GuoBaoLong
School: Xi'an University of Electronic Science and Technology
Course: Control Theory and Control Engineering
Keywords: Video Watermarking Geometric attacks Pseudo-Zernike moments Optimal Moments collection
CLC: TP309.7
Type: Master's thesis
Year: 2009
Downloads: 146
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Abstract


The technology of the digital watermark (Digital Watermarking) identification information (digital watermark) is embedded directly into the digital carrier (including multimedia, documentation, software, etc.), which does not affect the original vector value in use, the information can not be easily removed. Basis guarantee invisibility can be attacked with a dedicated watermark extraction algorithm detected the information. This paper systematically reviewed digital video watermarking research significance, research status, the main features and key technologies. In-depth study of the principles and algorithms of traditional digital video watermarking technology, analyze their strengths and weaknesses, and combine the image moment theory to study in detail the moment theory in the field of digital video watermarking technology. Tiny geometric attack (rotation, scaling and translation) the destruction of the image or video watermark, the watermark detection failed, therefore, designed to resist geometric attacks video watermarking algorithm watermarking technology research in a new direction. For rotation, scaling and translation (RST) geometric attacks can destroy the synchronization of the watermark detection, leaving the problem of failure of conventional watermark detection, a local pseudo-Zernike moments video watermarking algorithm LPZVW of (Video Watermarking in Scheme Based on local Pseudo-ZernikeMoments). The algorithm uses the normalized amplitude image pseudo-Zernike moments RST invariant nature, select the origin to the center of the image, the image width of 1/4 of the radius of the circle as the watermark embedding area, thereby reducing the attack brought about due to the rotation The edge of the impact, the moment rotational invariance. Combine video interframe high similarity, select the I frame and adjacent the P frame difference pseudo-Zernike moments as the optimal moment to set S, will be pseudo-Zernike moments reconstructed watermark image in airspace superimposed onto I-frame local to embed watermark. Watermark detection, to the best moments of the set S as the key to calculate pseudo-Zernike moments in the local area, I frame watermarked adjacent P frame pseudo-Zernike moments replacing the original I frame data extraction and detection watermark to improve the algorithm on the original data dependence. The experimental results show that the pseudo-Zernike moments using local video watermarking algorithm than using the global pseudo-Zernike moments in the guarantee to get better image quality, better rotation invariance attack any angle of rotation, scaling attack geometric attacks with good robustness.

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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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