| Summary: | 碩士 === 國立臺灣大學 === 電機工程學研究所 === 89 === Base on Internet and computer generalization, it is more important for digital information usage and management, especially for protection of copyright. Watermarking is the one of practical solutions. It not only hides data imperceptibly, but also supports security. Both legal user and owner can acquire well indemnification. In the thesis, we offer bar code-based algorithms and gray-scale coding to approach still-image watermark. It is easy and flexible to embed/extract watermark without any adjuncts, and resists different attack with specific functions. With bar code system and open algorithm, it will be convenient for e-commerce and image application
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