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Research of Robust Watermarking Algorithms Based on HVS of Image Transformation Domain

Author: ChenHongTao
Tutor: ZhuCongXu
School: Central South University
Course: Applied Computer Technology
Keywords: HVS Transform Domain Image Digital Watermarking Robustness
CLC: TP309.7
Type: Master's thesis
Year: 2009
Downloads: 166
Quote: 1
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Abstract


Digital watermarking technology to embed copyright information in digital products (digital images, audio, video, etc.) to confirm the ownership of the work, which provides a new idea for digital products copyright protection and multimedia information security. Robust watermark for copyright protection provides greater security, enhanced effectiveness to resolve the problem of intellectual property protection of digital multimedia products. The papers in the basic principles of research image digital watermarking technology and human visual system model based on the robustness of the algorithm transform domain based on the model of the human visual system in-depth analysis and research. This paper focuses on the human visual system based image transform domain robust digital watermarking technology, the research work are as follows: First, the proposed based HVS image wavelet domain robust digital watermarking algorithm. The digital watermarking algorithm based on human visual system (HVS) and discrete wavelet transform (DWT), experiments show that the algorithm has better robustness. Original image three discrete wavelet decomposition, JND visual threshold is calculated based on the visual masking characteristics of the human visual system; significant wavelet coefficients, the digital watermark is embedded into the significant wavelet coefficients of different frequency domain. The watermark embedding using the binary operation method, improved by modifying the fractional part of the wavelet coefficients to achieve the watermark embedding, to improve the visual quality of the image after the watermark embedding. The experiments show that the algorithm guarantee watermark visibility premise to improve the robustness of the watermark algorithm of JPEG compression, add the image noise, scaling, shearing and median filtering attack strong robustness. Then, a blind watermarking algorithm based on the Waston visual perception model DCT domain. The watermark algorithm first original image is divided into blocks, and then were each sub-block of DCT transform coefficients for each sub-block DCT transform; then Waston perceptual model to quantify the DCT transform coefficients for each sub-block, through Waston visual model to calculate the quantization step size, the quantization step size to select the embedding position of the watermark. Watermarked image scrambling and dimensionality reduction, the watermark is embedded into the DC coefficient of each sub-block of the elected or low frequency AC coefficients embedding algorithm using adaptive quantization method. The extraction of the watermark does not require the original image and the original watermark image, blind digital watermarking extraction. Finally, the proposed watermarking algorithm, experimental simulation experiments show that the image watermarking algorithm balance invisibility and robustness, better effectiveness. Finally, the summary of the major work done in this article, pointed out that further 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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