文化大學機構典藏 CCUR:Item 987654321/23851
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 46962/50828 (92%)
造访人次 : 12441366      在线人数 : 739
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻
    主页登入上传说明关于CCUR管理 到手机版


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://irlib.pccu.edu.tw/handle/987654321/23851


    题名: 差分演化法在最佳化向量量化式資訊隱藏之應用
    作者: 黃冠雄
    贡献者: 資訊管理學系
    关键词: 資訊隱藏
    information hiding
    向量量化
    vector quantization
    最低位元置換法
    least significant bit substitution
    差分演化法
    differential evolution
    日期: 2011
    上传时间: 2012-12-04 10:32:28 (UTC+8)
    摘要: 在資訊隱藏的領域中,隱藏量(hiding capacity)是一項重要的議題,因此有一些學者提出結合影像壓縮技術的資訊隱藏方法,這類的方法會將秘密影像先行壓縮,再將壓縮後的影像藏入偽裝媒體中,在這些方法中最常被使用的影像壓縮技術為向量量化(vector quantization, VQ)。最近Shie, Lin, and Jiang (2010)提出將秘密影像利用向量量化壓縮,並將壓縮後產生的索引表藏入編碼簿中,因此僅需將編碼簿傳給接收端,即可還原秘密影像。Shie等人的方法可提高藏密量與降低傳輸量,但其方法會破壞編碼簿,使得還原之秘密影像品質降低。本研究的目的便在於改善Shie等人的方法,在同時保有該方法的優勢下,盡可能地提昇還原的秘密影像品質。本研究利用差分演化法改變編碼字的排列,可使索引表藏入編碼簿時,對編碼簿的改變量最小,使得還原的秘密影像品質比Shie等人的方法更好。
    In the field of information hiding, the hidden capacity is an important issue, so there are some scholars proposed the video compression technology of the information hiding scheme, such method will compress the secret image first, then the compressed image is embed into the stego media, in these methods most commonly used video compression technology is the vector quantization (VQ). Recently Shie, Lin, and Jiang (2010) proposed a secret image compression using vector quantization, and the compressed index table generated is embedded into the codebook, so just transmit the codebook to the receiver, and receiver can restore the secret image. Shie et al.'s method can be increased the hiding capacity and improved to reduce the Transmission capacity, but the method will destroy the codebook, resulting the degradation of the quality of the restored secret image. The purpose of this scheme is to improve Shie et al.'s method, at the same time retain the advantages of this method, as much as possible to enhance the quality of the restored secret image. The proposed scheme, the differential evolution method will be utilized to change the arrangement of codeword, it will result the smallest amount of change for the codebook when the index table is embedded into the codebook, and the quality of the restored secret image will better than the Shie et al.'s method.
    显示于类别:[資訊管理學系暨資訊管理研究所 ] 博碩士論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    http___thesis.lib.pccu.edu.tw_cgi-bin_cdrfb3_gsweb.cgi_ccd=f3m2.pdf190KbAdobe PDF587检视/开启
    http___thesis.lib.pccu.edu.tw_cgi-bin_cdrfb3_gsweb.cgi_ccd=f3m.pdf159KbAdobe PDF272检视/开启
    http___thesis.lib.pccu.edu.tw_cgi-bin_cdrfb3_gsweb.cgi_ccd=f3m3.pdf957KbAdobe PDF1778检视/开启


    在CCUR中所有的数据项都受到原著作权保护.


    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈