| Summary: | 碩士 === 國立臺灣海洋大學 === 資訊工程學系 === 103 === Watermark-based copyright protection techniques have been investigated for more than two decades in the signal processing and the digital rights management communities. In this paper, following the previous works, we discuss the requirements of a watermark scheme for providing proof of ownerships, and build our scheme based on previous well developed signal processing techniques but focus on how to employ unpredictable signature-seeded pseudorandom bit sequence to not only establish the unique relation between the watermark, the identity of true owner, and the original cover work, but also make the false positive watermark detection rate computationally negligible. We formally prove that if a valid watermark can be found in a disputed image, the probability that this image is not derived from the true owner’s published image is computationally negligible.
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