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A Novel Digital Watermarking Algorithm Based on DCT and SVD

Author: CaiYue
Tutor: LiuQuan
School: Wuhan University of Technology
Course: Communication and Information System
Keywords: Copyright Protection Digital watermarking DCT technology Singular Value Decomposition Robustness
CLC: TP309
Type: Master's thesis
Year: 2006
Downloads: 422
Quote: 11
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Abstract


The widespread use of multimedia digital works, dissemination inevitable illegal copying and tampering, making digital works of information security and copyright protection has become an urgent problem to be solved. Digital watermarking technology widespread use of digital works redundant data and randomness, adding to the digital works can be judged distinguish subtle but secret information - the watermark to protect digital copyright or completeness. Digital watermarking technology has become the digital information to solve security problems especially digital copyright protection is an effective means, has been widely studied and applied. In this paper, in-depth understanding of current domestic and international research status on digital watermarking based on the DCT and singular value decomposition theory principles, characteristics and their use in the field of digital watermarking application advantages, we propose a new DCT-based and singular value decomposition digital watermarking algorithm. The algorithm before embedding the watermark text to serialize bitmap pretreatment, its purpose is to improve the confidentiality of the watermark signal, and enhance the ability of the watermark to resist malicious attacks. DCT digital works in accordance with the characteristics of the application, the original image sub-blocks, each block DCT, then for each block of DCT coefficient matrix singular value decomposition, the watermark is essentially loaded into the domain through the singular value decomposition . Text watermark is meaningful, but embedded in the carrier image watermark signal is meaningless random sequence, which greatly improves the confidentiality of the system, thereby further enhancing the confidentiality of information and watermark robustness. This algorithm with a conventional digital watermarking method, compared with its emphasis on meaningful commitment to the protection of the watermark in the watermark secrecy and robustness are significantly improved. Theoretically this algorithm uses DCT and singular value decomposition and other integrated technologies that can significantly improve the confidentiality of the watermark, the watermark image makes a strong robustness for copyright protection of digital works extremely important theoretical value and economic value. Paper finally provides the DCT and SVD-based digital watermarking algorithm analysis of experimental results and related data, and the algorithms and classical SVD embedding algorithm for comparison. Large number of experimental results show that the algorithm proposed by the paper and the resulting digital watermark image to ensure that the digital watermark invisibility and transparency of the digital image, image processing, and the common digital works both with good robustness. Text on image cropping, image translation, JPEG compression, Gaussian noise and sharpening process experimental results are given. This algorithm can adapt to various forms of meaningful digital watermark embedding, as well as various forms of digital works meaningful digital watermark embedding provides a theoretical basis and practical value.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality
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