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    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/9596

    Title: 高隱藏容量及隱藏效能之資料隱藏技術
    Authors: 詹啟祥
    Contributors: 資訊學院
    Keywords: 秘密資料隱藏技術
    Matrix 編碼法
    Date: 2009
    Issue Date: 2010-05-13 10:31:58 (UTC+8)
    Abstract: 秘密資料隱藏技術是一個熱門的研究議題。秘密資料隱藏技術中最基本的概念,是將秘
    量」為 1 bpp (每個像素所能藏的秘密資料位元數)。另外一方面,Matrix Coding的方法具
    有高「隱藏效能」,但是其「隱藏容量」卻很低,其「隱藏容量」為 3/7 bpp。在本計畫中,
    Mielikainen提出利用LSB Matching revisited的方法,來做秘密資料隱藏。他的方法將原始
    用互斥或函式(XOR Function)來連接所有影像像素,只有當互斥或函式所產生的資料,其資
    在本計畫的第二年,我們修改Matrix Coding的方法,以進一步增進「隱藏容量」以及「隱
    藏效能」。雖然Matrix Coding的方法具有很高的「隱藏效能」,但其「隱藏容量」只有 3/7
    bpp。在我們所提的方法中,我們首先修改Matrix Coding的方法,以增加「隱藏容量」到 3/4
    可以預期的, 第一年所提的方法跟第二年的方法比較,具有較高的 「隱藏容量」,然
    Information hiding is a popular research topic. The basic concept of
    information hiding embeds secret data into meaningful multimedia data,
    such as videos and images. Among all information hiding,
    Mielikainen’s method has high embedding capacity (1 bpp) and
    acceptable embedding efficiency. On the other hand, Matrix Coding
    method has high embedding efficiency but low embedding capacity (3/7
    bpp). In this proposal, we are going to propose two subjects that
    modify those two methods to improve both embedding capacity and
    embedding efficiency.
    In the first subject, we modify Mielikainen’s method to further
    improve its embedding efficiency. Mielikainen proposed the LSB
    matching revisited to do information hiding. The method first groups
    cover pixels into pixel pairs. For each pair, at most one pixel is needed
    to be modified by adding/subtracting its value to/from one, and two
    secret bits are able to be embedded into two cover pixels. However, it
    can further reduce the number of modified pixels. The proposed
    method applies the function called XOR Function to link all bits of cover
    pixels. The modifications are happened only when the resultant bits of
    XOR Function are different from secret bits.
    In the second subject, we modify Matrix Coding method to further
    improve its embedding capacity and embedding efficiency. Although
    the original Matrix Coding method has high embedding efficiency, its
    embedding capacity is only 3/7 bpp. The proposed method modifies
    the original method to increase its embedding capacity to 3/4 bpp.
    Appears in Collections:[行動商務與多媒體應用學系] 科技部研究計畫

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