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Reversible Watermarking Based On Histogram Shifting  

Hwang, Jin-Ha (상명대학교 디지털저작권보호연구센터)
Kim, Jong-Weon (상명대학교 디지털저작권보호연구센터)
Choi, Jong-Uk (상명대학교 소프트웨어대학)
Abstract
In this paper, we propose a reversible watermarking algorithm where an original image can be recovered from the watermarked image. Most watermarking algorithms cause degradation of image quality in original digital contents in the process of embedding watermarks. In the proposed algorithm, the original image can be obtained when the degradation is removed from the watermarked image after extracting watermark information. In the proposed algorithm, we utilize a peak point of image histogram and the location map and modify pixel values slightly to embed data. Because the peak point of image histogram and the location map are employed in this algorithm, there is no need of extra information transmitted to the receiving side. As the locations watermark embedding are identified using the location map, the amount of watermark data can increase through recursive embedding.
Keywords
Watermarking; Reversible; Authentication; Histogram Shifting;
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