Optimnu JPEG Watermarking Based on Genetic Algorithms

• Main Authors: Chiang Chih-chen, 江至晨
• Other Authors: Kung Chih-hsien
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/62374334771209270590

碩士 === 長榮大學 === 經營管理研究所 === 93 === With the rapid growth of the Internet, Multimedia, and E-Commerce, it becomes more convenient and fast for the users to interchange the information. However, the image files are extremely huge, it is necessary to use the compression technology to reduce the file space. Digital watermarking is one of commonly used techniques to hide information in images to protect copyright. To increase the application of watermarking area, the two techniques, digital watermarking and high image compression standard of JPEG, will be integrated in the thesis. In the processing of embedding watermark, the quantization field will be obtained from Q. According to the quantization field, the coefficients of DCT will be modified in the processing of embedding the watermark. In order to embed the watermark, middle frequency and the position information of watermark are needed, and the technique of GA is used to obtain the best position for the sake of embedding watermark. By adoptting the GA algorithm, PSNR and NC value will be promoted.