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Research on Algorithms of Digital Image Watermarking Based on Contents

Author: HuJia
Tutor: JiHongBingï¼›TongMing
School: Xi'an University of Electronic Science and Technology
Course: Signal and Information Processing
Keywords: Mathematical Morphology EMD Zero watermark Wavelet Transform Contourlet Transform
CLC: TP309.7
Type: Master's thesis
Year: 2009
Downloads: 150
Quote: 5
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Abstract


Due to the characteristics of digital works can easily be illegally copied and tampered, information security and copyright protection of digital works to the urgent need to address the problem. To achieve effective protection of intellectual property rights, the digital watermarking technology provides a new way of thinking and means, has become a hot topic in the field of multimedia information security, and has broad application prospects. Thesis, the robustness of content-based digital image watermarking technology, discovered through research and analysis of existing algorithms and how to take full advantage of the inherent characteristics of the image itself is a new direction for the development of robust watermark, in order to improve the robustness of the watermarking algorithm , this paper presents a based morphological image strong texture watermarking algorithm. Morphological characteristics of the algorithm is based on the strong texture of the image, extracting strongly textured area and analyzed to verify the correctness and accuracy; the use of time-frequency mapping theory, the strong texture area is mapped to the structure of the wavelet tree, embedding the watermark in the corresponding wavelet coefficients; In order to balance the transparency and robustness of the algorithm based on human visual masking adaptive adjust the watermark embedding strength. The experiments show that the algorithm has a good robustness against common attacks. Algorithm morphological strong texture region extraction method, has a natural parallel realization structure, compared to the classical method of the airspace, simple and quick, high efficiency, adaptive to a variety of images. In order to take advantage of the image characteristics to improve the algorithm robustness, this paper presents an image based on empirical mode decomposition (Empirical Mode Decomposition, EMD) double watermarking algorithm. Algorithm based on EMD of the good characteristics of image detail screening capacity, accurate extraction of the image strong texture area, select the directional sub in the corresponding the Contourlet domain of energy and strong texture regions with embedded watermark in the intermediate frequency coefficient; the use of anti-noise type scale morphological edge detection operator to extract image edge features constructed zero-watermark. Dual watermarking algorithm of this paper make full use of the texture and edge characteristics of the image, the watermark image content closely integrated to improve the robustness and security of the algorithm. The experiments show that the algorithm has strong robustness to noise, filtering, compression attacks; transparency, good performance and because the zero-watermark does not change the inherent superior characteristics of the host image, so the algorithm. Finally, gave a brief summary of the dissertation contents, and future research directions.

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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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