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    題名: Pyramid Difference Reversible Image Watermarking Scheme
    作者: Chen, Chien-Chang
    貢獻者: 淡江大學資訊工程學系
    關鍵詞: Reversible watermarking;Block centering difference;Histogram modulation
    日期: 2012-08
    上傳時間: 2012-10-11 12:35:26 (UTC+8)
    出版者: ICIC International
    摘要: 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.
    關聯: ICIC Express Letters 6(8), pp.2179-2184
    顯示於類別:[資訊工程學系暨研究所] 期刊論文

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