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    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/64304

    Title: An Image Authentication Method by Grouping Most Significant Bits
    Authors: 詹啟祥;Chan, Chi-Shiang;蔡淵裕;Tsai, Yuan-Yu;劉兆樑;Liu, Chao-Liang
    Contributors: 資訊多媒體應用學系
    Date: 201303
    Issue Date: 2013-10-29 11:09:59 (UTC+8)
    Abstract: In 2011, Chan proposed an image authentication method by producing the parity check bits from pixels whose bits have been rearranged. Due to
    this rearrangement, the value of the most significant bit of each tampered pixel can be determined according to
    its parity check bits. With the help of the most-significant bit of the pixel, the pixel can be recovered by selecting two possible (7, 4)Hamming code
    words. However, if the distance between two Hamming code words is within a certain range, incorrect selection may occur. Chan’s method added one additional bit to indicate the correct one. It is trivial that this may degrade the quality of the authenticated image. In this paper, we group four most-significant bits into different groups to form a mapping codebook and the mapping codebook is used to produce authentication data instead of the (7, 4) Hamming code book. The experimental results show that the proposed method has a greater ability to recover tampered areas.
    Relation: Journal of Electronic Science and Technology, 11(1),pp.33-37.
    Appears in Collections:[行動商務與多媒體應用學系] 期刊論文

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