Digital Image Watermarking Based on Fractal Compression Scheme

• Main Authors: Wei-Rong Tseng, 曾緯榮
• Other Authors: Chi-Hang Yang
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/22085167290982840415

碩士 === 國立高雄第一科技大學 === 電腦與通訊工程系 === 89 === In the end of 20’th century, the digital revolution brings limitless convenience for people. Internet has taken the place of conventional medium. It becomes the most efficient medium. The creations show people rich and colorful appearance by the Internet and multimedia. The protection of intellectual property is very important. The creator and copyright owner don’t wish their work would be cribbed. The digital watermarking technology has been respected in order to protect every lawful owner’s rights. And more investigators are devoted to the study of this issue. In this thesis, our algorithm is a new way based on fractal compression scheme. The previous technology embeds the watermark into position’s parameters and rotation type of fractal code with searching procedure in fractal compression. We adjust gray mapping transforms parameters by way of sub-optimal least squares approach in order to embed the watermark into the fractal code. Compared with the previous skills, the algorithm has better result in resisting JPEG compression. And it could resist the overlapping, daubing, noise and various attacks.