Digital Watermarking Scheme Resisted the Permutation Attack and Phase Perturbation Attack

• Main Authors: Chia-An Huang, 黃家安
• Other Authors: Bin-Yih Liao
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/53762954096944043389

碩士 === 國立高雄應用科技大學 === 電子與資訊工程研究所碩士班 === 95 === With the rapid growth of the Internet and the development of digital multimedia technologies, exchange and copy of digital multimedia have become very convenient. To protect the copyright and ownership of those documents, digital watermarking is often used to prevent the illegal duplication. In recent years, a series of subsampling based watermarking schemes have been proposed. In 2005, Lu et al. proposed a permutation attacking algorithm which can effectively destroy the watermarks are embedded by this kind of schemes. In 2007, Pan et al. proposed a phase perturbation attack method to attack the phase shift keying based watermarking schemes. After attacking, the watermark cannot be extracted correctly. In resisted permutation attack method, we proposed to embed the watermark information into the average value of the of the DWT coefficients of the subimages. In resisted phase perturbation attack method, we proposed an approach by combining two watermark schemes to achieve the goal of resisting the attack of phase perturbation at the method. Experiment results show that our scheme can resist both the permutation attacking and phase perturbation attacking effectively, and the PSNR value of the watermarked image is also very high. Besides, the watermark extraction does not require the original image so as to be more practical in real application.