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題名 | 結合尺度不變特徵轉換之盲目浮水印加密及抽取機制=The Study of Blind Watermark Embedding and Extraction Scheme Utilizing SIFT |
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作者 | 吳志堅; 李勝義; 蔡蕙逢; | 書刊名 | 健行學報 |
卷期 | 33:2 2013.04[民102.04] |
頁次 | 頁1-17 |
分類號 | 312.76 |
關鍵詞 | 尺度不變特徵轉換; 盲目浮水印; 密鑰管理; 數位浮水印; 離散小波轉換; Blind watermarking; Digital watermarking; Discrete wavelet transform; Scale-invariant feature transform; Secret keys management; |
語文 | 中文(Chinese) |
中文摘要 | 目前一般數位浮水印機制,若要具備能抵抗幾何攻擊,尤其是旋轉攻擊的能 力,通常需要配合非盲目或半盲目的浮水印抽取機制,此類機制於數位影像數量 有限時或許尚不至成為問題,但是當需要保護的影像持續增加時,此機制將面臨 密鑰管理與查詢問題而難以有效運作,此時就必須另外建構一套管理系統用來搜 尋及確認原始數位影像之相關資訊。本研究嘗試提出一個新的盲目浮水印加密及 抽取機制,配合浮水印預設強度以及影像本身統計資訊,結合尺度不變特徵轉換 以及離散小波轉換,以調適性方式於特定區塊藏入浮水印,實驗結果證實此機制 確有其可行性,不僅能抵抗旋轉以及一般的浮水印壓縮攻擊,並可大幅減輕密鑰 存管問題,同時可滿足一般浮水印系統的不可視性、強健性與機密性等基本要求。 |
英文摘要 | Nowadays most of the digital watermarking systems which can resist geometric attacks, especially the rotation attack, usually need to apply the non-blind or semi-blind watermark extraction schemes, if there are just a few number of digital imagery that need to be protected, using these non-blind or semi-blind watermarking systems may be feasible, however these systems will face severe problems of secret keys management and inquiry while the number of protected digital images continuous increasing, that will result in the requirement for the additional construction of a management system to search and indentify the original imagery and related information. In this study we propose a new watermark encryption scheme, with the pre-defined watermark strength and statistical information of the protected imagery. By utilizing the scale-invariant feature transform (SIFT) and discrete wavelet transform, the watermarks can be adaptive embedded into selected blocks. Simulation results show this scheme not only satisfy the requirements to resist common rotation and compression attacks, but also significantly reduce the secret keys depository problems, while meeting the basic requirements of watermarking system for invisibility, robustness and confidentiality. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。