【正文】 畢 業(yè) 論 文 題 目： 變換域下的數(shù)字圖像水印技術(shù)研究 畢業(yè) 設(shè)計（ 論文 ） 中文摘要 變換域下數(shù)字圖像水印技術(shù)研究 摘要 ： 科技進步給我們的生活帶來極大 便利的同時也帶了以前不曾出現(xiàn)的問題。 對數(shù)字產(chǎn)品版權(quán)保護的探求， 就 一直 是大家廣為關(guān)注的方向。基于變換域下的數(shù)字圖像水印處理技術(shù)就是 圖像領(lǐng)域 中 的一個重要課題。本文主要 基于 對數(shù)字圖像水印系統(tǒng)在變換域下的實現(xiàn)方案進行深入的研究與分析。研究了 在 離 散余弦變換域下和小波變換域下分別對 數(shù)字圖像進行水印 信息 的置亂 、 嵌入和提取操作， 以及在算法實現(xiàn)后對水印系統(tǒng)進行包括噪聲、濾波、壓縮、剪切和旋轉(zhuǎn)的水印攻擊測試。 在本文 最后還分別對 基于 兩種算法 的水印系統(tǒng) 進行定量的比較分析 。 關(guān)鍵詞 ： 數(shù)字水印；離散 余弦變換；小波變換；圖像置亂；水印攻擊 畢業(yè) 設(shè)計（ 論文 ） 外文摘要 Title Research on digital image watermarking technology under the transform domain Abstract While we are enjoying the convenience of our life which was brought by the development of science and technologies, it also creats many problems that had never appeared before. It is been widely discussed that the exploration of the securities of digital products. And it is a important subject that the digital graphic watermark processing technique aimed at the domain of image under the tranform domain. This paper deeply studied and analysed the practical methods to creat a digital image watermarking system under the transform mainly studied the operations of correctly watermark embedding and extracting digital image under the discrete consine transform domain and the wavelet transform domain. And it studied attacked watermark tests of water mark system involved in noise,filtering, pression,shear and rotation after the realization of algorithm. Besides,to ensure the security of digital watermark system,it also studied the content of scrambling algorithm,such as Arnold scrambling algorithm. Keywords： Digital watermarking。DCT。DWT。Image scrambling。Watermark attack 目 錄 1 緒論 ............................................................................................................................ 1 課題的背景和意義 ............................................................................................. 1 數(shù)字水印的起源與研究現(xiàn)狀 ............................................................................. 2 論文的主要工作和內(nèi)容 ..................................................................................... 4 2 數(shù)字圖像水印技術(shù) .................................................................................................... 5 數(shù)字圖像水印技術(shù)的含義及特性 ..................................................................... 5 數(shù)字圖像水印 系統(tǒng) 的分類 ................................................................................. 5 典型數(shù)字圖像水印算法介紹 ............................................................................. 7 空域水印 ..................................................................................................... 7 變換域水印算法 ......................................................................................... 7 其他水印算法 ............................................................................................. 8 水印的置亂方法 ................................................................................................. 8 Arnold 置亂算法 ....................................................................................... 8 Arnold 逆變換 ........................................................................................... 9 水印攻擊方法 ..................................................................................................... 9 攻擊方式分類 ............................................................................................. 9 攻擊原理分類 ............................................................................................10 數(shù)字水印評估的常見標(biāo)準(zhǔn) ................................................................................ 11 人類視覺系統(tǒng) HVS............................................................................................. 11 3 基于離散余弦變換（ DCT）的水印系統(tǒng)算法 .........................................................13 離散余弦變換的基本原理 ................................................................................13 DCT 變換的定義 ........................................................................................13 DCT 域系數(shù) ................................................................................................13 離散余弦變換算法實現(xiàn)的基本步驟 ................................................................15 水印的置亂加密 ........................................................................................15 水印的嵌入 ................................................................................................15 水印的提取 ................................................................................................16 水印的攻擊測試 ........................................................................................17 離散余弦變換算法的實驗結(jié)果及分析 ............................................................18 4 基于 小波變換（ DWT）的水印系統(tǒng)算法 .................................................................22 小波變換的基本原理 ........................................................................................22 小波變換的定義 ........................................................................................22 圖像小波分解 ............................................................................................24 離散小波變換算法實現(xiàn)的基本步驟 ................................................................26 Arnold 置亂加密 ......................................................................................26 小波基的選取 ............................................................................................27 嵌入算法 ....................................................................................................27 提取算法 ....................................................................................................28 水印的攻擊測試 ........................................................................................28 算法結(jié)果與分析 ................................................................................................28 ...............................................................................................32 總結(jié) .