【正文】 摘 要 I 摘 要 本文對(duì)多種數(shù)字水印算法進(jìn)行了研究、對(duì)比和改進(jìn) ．首先 基于 matlab 編程進(jìn)行實(shí)際檢驗(yàn)， 驗(yàn)證算法的可行性，然后從水印的置亂、嵌入和提取三個(gè)方面，根據(jù)實(shí)際檢驗(yàn)的參數(shù) 對(duì)這些算法的魯棒性、抗攻擊性和隱蔽性進(jìn)行了對(duì)比分析，同時(shí)測(cè)量了各水印算法的數(shù)據(jù)容量，并 對(duì) 部分 算法中的瑕疵給出了改進(jìn)建議 ． 其中魯棒性的檢驗(yàn)主要是對(duì)水印后的圖像進(jìn)行 JPEG 壓縮、旋轉(zhuǎn)、裁剪等操作，然后觀察提取出的水印圖像是否被破壞，并用實(shí)際數(shù)據(jù)表示破壞程度，進(jìn)行對(duì)比分析．不同水印算法的數(shù)據(jù)容量的測(cè)量主要是通過(guò)計(jì)算同一原始圖像中可以嵌入的水印 圖像的大小，并測(cè)量水印圖像的數(shù)據(jù)量來(lái)實(shí)現(xiàn)． 關(guān)鍵詞 數(shù)字水??；小波變換； 離散余弦變換； 奇異值分解； Matlab Abstract II Abstract In this paper, a variety of digital watermarking algorithm is studied, pared and improved. Firstly, based on the MATLAB programming of the actual test, verify the feasibility of the algorithm. And then, from the scrambling, embedding and extracting three aspects, the robustness, anti attack and concealment of these algorithms are pared according to the actual test parameters. Simultaneous measurement of various watermarking algorithm data capacity, and part of the algorithm flaws given suggestions for improvement. The test of robustness is mainly JPEG pression, rotation, clipping and other operations on the image after the watermark, and observe whether the extracted watermark image is being destroyed, and with the practical data, said the damage degree, carries on the contrast analysis. The measurement of the data capacity of different watermarking algorithms is mainly through calculating the size of the watermark image which can be embedded in the same original image, and measuring the amount of the watermark image data to achieve. Keywords Digital Watermarking。 Wavelet Transform。 Discrete Cosine Transform。 Singular Value Deposition。 Matlab 目 錄 III 目 錄 摘要 ................................................................................................................................. I Abstract ..........................................................................................................................II 目錄 .............................................................................................................................. III 第 1章 緒論 ................................................................................................................ 1 課題研究背景 ................................................................................................ 1 數(shù)字水印的應(yīng)用 ............................................................................................ 2 數(shù)字水印研究現(xiàn)狀 ........................................................................................ 4 發(fā)展現(xiàn)狀 .............................................................................................. 4 算法現(xiàn)狀 .............................................................................................. 4 本文主要研究?jī)?nèi)容 ........................................................................................ 5 第 2章 離散小波變換和奇異值分解的研究綜述 .................................................... 6 引言 ................................................................................................................ 6 離散小波變換 ................................................................................................ 6 奇異值分解 .................................................................................................... 7 第 3章 基于 SVD和 Radon變換的抗旋轉(zhuǎn)攻擊盲水印算法的分析 ..................... 8 算法主體 ........................................................................................................ 8 嵌入前的水印圖像置亂 ...................................................................... 8 水印嵌入過(guò)程 ...................................................................................... 9 水印提取 ............................................................................................ 10 算法仿真實(shí)驗(yàn) .............................................................................................. 11 算法性能分析 .............................................................................................. 14 第 4章 一種用哈達(dá)瑪矩陣進(jìn)行置亂變換的盲水印算法的分析 .......................... 15 算法主體 ...................................................................................................... 15 嵌入前的水印圖像置亂 .................................................................... 15 水印嵌入過(guò)程 .................................................................................... 16 水印提取 ............................................................................................ 16 目 錄 IV 算法仿真實(shí)驗(yàn) .............................................................................................. 17 算法性能分析 .............................................................................................. 21 第 5章 一種新的小波域盲水印算法的分析 .......................................................... 22 算法主體 ...................................................................................................... 22 嵌入前的水印圖像置亂 .................................................................... 22 水印嵌入過(guò)程 .................................................................................... 22 水印提取 ............................................................................................ 24 算法仿真實(shí)驗(yàn) .............................................................................................. 25 算法性能分析 .............................................................................................. 28 第 6章 基于子塊區(qū)域分割和自嵌入技術(shù)的全盲多功能圖像水印 算法的分析 .. 29 算法主體 ...................................................................................................... 29 水印生成 ............................................................................................ 30 水印置亂 ............................................................................................ 30 水印嵌入過(guò) 程 .................................................................................... 31 水印提取 ............................................................................................ 32 算法仿真實(shí)驗(yàn) .................................................................................