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Based on Research and Realization of Video Watermark Technology for MPEG-4

Author: WangJianHua
Tutor: TianYaFei
School: Lanzhou University
Course: Communication and Information System
Keywords: Video digital watermarking MPEG-4 Drift compensation DCT transform
CLC: TP309.7
Type: Master's thesis
Year: 2007
Downloads: 186
Quote: 3
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Abstract


In this paper, a video watermarking technology and its application for MPEG series of standards . Discusses the basic principle of video watermarking technology and video compression algorithm , characteristics . MPEG-4 video watermark value of research in the field of digital copyright protection . New technical requirements of the MPEG-4 standard video watermarking technology . Analysis of several classic literature MPEG-4 watermarking algorithm . Designed and implemented an MPEG-4 compressed domain watermarking algorithm . DES encryption algorithm and spread spectrum technology to improve the security of the watermark sequence . Use the the synchronization template to reduce the geometric distortion of shear , scale change and rotation operations . Drift compensation is to eliminate due to the intra - video object plane I-VOP (Intra-Frame VOP) in the AC / DC coefficient prediction and interframe prediction video object plane P-VOP (Inter-frame VOP prediction), bidirectional prediction video object plane interference caused by the motion compensation encoding of B-VOP (B-directionally predicted VOP) and visual degraded problems, make the watermark robust attack resistance format conversion . And to ensure the quality of the visual . Using the control mechanism of the bit stream to ensure that the rate of the watermarked data . The experiments show that the algorithm after processing in the watermark video of the MPEG-4 after filtering , rotation , scale changes , code conversion coding , achieved good results in the visibility and 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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