| Summary: | 碩士 === 國立交通大學 === 管理學院碩士在職專班資訊管理組 === 94 === Because of the development of Internet and digitization of information technique, people can easily edit, copy, and transmit the digital information to any place of the world. But the progress of information technique also causes some problems about security, including the illegal copies, transmission, and unauthorized downloads of all kinds of digital content that infringe the intellectual property rights.
Among all the methods for digital content copyright protection, digital watermarking technique can embed the copyright information into the digital content with watermarks. If any dispute of copyright occurs, we can extract the watermark through specific procedure to distinguish it and make the copyright of digital content to be protected.
This thesis is based on wavelet transformation theory. We modify the wavelet coefficient values of images in frequency domain dynamically and use the differentiation to embed the watermark. We also use the image cutting-and-assembling mosaic method to improve the ability of resistance to malicious geometric attacks, and make our method more robust and securer.
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