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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/78537

    Title: Pyramid Difference Reversible Image Watermarking Scheme
    Authors: Chen, Chien-Chang
    Contributors: 淡江大學資訊工程學系
    Keywords: Reversible watermarking;Block centering difference;Histogram modulation
    Date: 2012-08
    Issue Date: 2012-10-11 12:35:26 (UTC+8)
    Publisher: ICIC International
    Abstract: A reversible watermarking scheme extracts the embedded watermarks and then recovers the original image from the watermarked image. This study presents a reversible image watermarking scheme based on the proposed block centering difference method and the absolute histogram modulation method. The block centering difference method calculates the differences between pixels from the center to the outside of a 5x5 block. Thus, the absolute values of pixel differences are always restricted in a small range, so as that the number of peak value in the histogram of a 5x5 block is higher than that of the whole image. The modified absolute histogram modulation method embeds watermarks into both positive and negative differences in a 5x5 block. Experimental results indicate that the quality of watermarked image and the embedded capacity are good. Comparisons with other works demonstrate the excellent performance of the proposed scheme.
    Relation: ICIC Express Letters 6(8), pp.2179-2184
    Appears in Collections:[Graduate Institute & Department of Computer Science and Information Engineering] Journal Article

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