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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/102607

    Title: 基於小波轉換且對比強化之可逆可視浮水印技術研究
    Other Titles: Wavelet-based reversible and visible image watermarking scheme
    Authors: 蔡瀚威;Tsai, Han-Wei
    Contributors: 淡江大學資訊工程學系資訊網路與通訊碩士班
    陳建彰;Chen, Chien-Chang
    Keywords: 浮水印;小波轉換;對比強化;visible watermark;reversible watermark;Wavelet transform
    Date: 2014
    Issue Date: 2015-05-04 09:59:56 (UTC+8)
    Abstract: 本論文提出一個以小波轉換為基礎,輔以改良對比度之可逆浮水印技術。此嵌入技術可將浮水印影像嵌入至數位影像中,而僅需使用嵌入浮水印後的掩護影像及嵌入過程所產生的例外紀錄,即可還原獲得原數位影像,並獲得已嵌入的浮水印影像。
    A visible reversible image watermarking scheme embeds visible watermark into digital images for ownership identification and the embedded watermark can be removed to recover the original image. The proposed scheme first partitions the cover image to four similar images with half size in width and height. These 4 images are classified to two sets, fixed set (FS) and watermarked set (WS), and each image is then applied to forward wavelet transform for acquiring 4 low-pass subimages for embedding watermark image. The number of FS and WS deter-mines the stability or visibility of embedded watermarks. The coefficients in FS are stationary and the watermark image is embedded into low-pass coefficients of WS based on low-pass coefficients of FS. Experimental results show that the proposed scheme has good watermark similarity and good extraction result under cropped or noise attacks.
    Appears in Collections:[資訊工程學系暨研究所] 學位論文

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