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Erschienen in:
2005 | OriginalPaper | Buchkapitel
A Reversible Watermark Scheme Combined with Hash Function and Lossless Compression
verfasst von : YongJie Wang, Yao Zhao, Jeng-Shyang Pan, ShaoWei Weng
Erschienen in: Knowledge-Based Intelligent Information and Engineering Systems
Verlag: Springer Berlin Heidelberg
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The paper presents a reversible watermark scheme based on hash function and lossless compression technology. The paper extracts the abstract information of the image as hash code and lossless compresses the LSB(Least Significant Bit) of the image to make some space where the image hash can be completely inserted. It needs to be done without introducing a large distortion to the image. The scheme can achieve the authentication purpose by hash code and restores the original image by retrieving the watermark sequence completely because of the lossless decompression of the LSB of the image.