數位影像浮水印系統:模擬、效能分析、與應用 A Digital Image Watermarking System : Modeling , Performance Analysis , and Application 陳佩君 陳永盛 許文星

In this paper, we interpret the watermarking problem as a digital communication problem. There are three main criteria concerning the performance of a watermarking technique: capacity, imperceptibility, and robustness. We then show the tradeoffs between these three criteria adopting concepts from the digital communication theory. After the analysis has been established, two watermarking schemes adaptive to human visual system (HVS) are proposed. In addition, error correction coding and spread spectrum communication techniques are used to lower the watermark detection error. After the analysis on watermarking systems and proposition of new watermarking techniques have been performed, a digital internet image library (IIL) in the WWW is presented as a watermark application for copyright protection in the internet. Keyword:communication theory, human visual system, digital watermarking, WWW. † To whom all correspondence should be addressed.