自適應性嵌入多階層直方圖之可逆式資訊隱藏 = Content-Adapt...
國立高雄大學電機工程學系碩士班

 

  • 自適應性嵌入多階層直方圖之可逆式資訊隱藏 = Content-Adaptive Multi-Level Alteration for Lossless Data Hiding
  • 紀錄類型: 書目-語言資料,印刷品 : 單行本
    並列題名: Content-Adaptive Multi-Level Alteration for Lossless Data Hiding
    作者: 賴偉豪,
    其他團體作者: 國立高雄大學
    出版地: [高雄市]
    出版者: 撰者;
    出版年: 2012[民101]
    面頁冊數: 82面圖,表格 : 30公分;
    標題: 可逆式資訊隱藏
    標題: Lossless data hiding
    電子資源: http://handle.ncl.edu.tw/11296/ndltd/02294625931415061234
    附註: 106年10月31日公開
    附註: 參考書目:面70-72
    摘要註: 因科技快速的發展以及數位化的時代,造成靠網路就可即時得到許多資訊,因此造成許多非法問題間接的產生,如盜用、複製等等侵犯著作權法等法律問題。所以在本篇論文中我們將提出無損可逆式資料隱藏方法,這是一個在數位浮水印資料隱藏中較新的分歧方式,利用此技術就可在當編碼端利用自知的嵌入技術配合額外資訊將數位浮水印嵌入後,在解碼端讓合法擁有者就可以利用已知的額外資訊將無損的擷取回以及原始檔案的還原判斷此物品的真假。本篇論文中我們將針對提高可藏匿量以及影像品質兩相抵觸中來取得平衡,利用差值直方圖為架構來延伸突破傳統過去的方法,為了提高可藏匿量將利用像素值相鄰特性算出相鄰差值,將相鄰差值直方圖中差值較小的地方藏入兩個位元提高藏匿量,以及為了避免因直方圖的位移太多格降低影像品質來藏匿,所以配合使用影像的特性利用四元樹切割將影像切割出平滑以及粗糙區塊,利用平滑區域在低藏量未藏入兩個位元方式,來提高低藏量影像品質如此兩個方式的相結合提出三種不同的可逆式資訊隱藏方式來相互比較;以及我們將此應用架構結合了醫療系統中HL7醫學傳輸協定確保醫療系統之間醫療訊息的安全,將傳輸過程中產生的XML電子病歷檔做編碼轉換成數位浮水印資訊,在以不影像醫師判斷下來將電子病歷檔嵌入於醫學影像當中做無損可逆式資訊隱藏用來保護個人病歷隱私安全,不僅讓醫學影像受到保護也可讓醫師診斷同時得到雙份資訊。 Lossless data hiding, also known as reversible data hiding, is a newly developed research field and relating applications in digital rights management (DRM). Secret information can be hidden into original image at the encoder, and then image containing secret data is delivered to the decoder. For decoding, original image and secret information need to be perfectly recovered from the received image. By modifying selected pixel values in the histogram of original image, the larger amount of secret information can be embedded at the encoder. Later on, with the reasonable size of side information, both the original image and the secret information can both be recovered. We take the relationships between adjacent pixels into consideration, and propose a scheme that is able to hide more than one bit per pixel of data capacity, with the reasonable output image quality. Simulation results with our algorithm works well under the requirement of high data capacity for lossless data hiding.In cooperation with the Health Level seven (HL7) standard, we employ reversible data hiding to further assist reducing the human errors during the exchange of information delivery. Reversible data hiding has attracted more and more attention in both researches and applications. We consider hiding part of the HL7 information into medical images at the encoder, and at the decoder, both the original image and HL7 information can be perfectly recovered. Simulation results demonstrate the superiority over existing schemes, and the effectiveness for practical applications.
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