【正文】 本科畢業(yè)設(shè)計(jì)說(shuō)明書 題 目 ： 面向醫(yī)學(xué)圖像的數(shù)字水印 算法設(shè)計(jì) 山東建筑大學(xué)畢業(yè)設(shè)計(jì)說(shuō)明書 I 目 錄 摘 要 ...................................................................................................................................... III ABSTRACT............................................................................................................................IV 1前 言 .................................................................................................................................. 1 選題的背景和意義 ......................................................................................................... 1 國(guó)內(nèi)外研究現(xiàn)狀 ............................................................................................................ 2 本論文的研究?jī)?nèi)容和組織結(jié)構(gòu) .................................................................................... 5 2醫(yī)學(xué) 圖像 數(shù)字水印技術(shù)概論 ...................................................................................... 6 數(shù)字水印的概述 ............................................................................................................ 6 數(shù)字水印系統(tǒng)的基本模型 ............................................................................................ 9 數(shù)字水印的攻擊方法 .................................................................................................... 9 數(shù)字水印系統(tǒng)的性能評(píng)估 .......................................................................................... 11 醫(yī)學(xué)數(shù)字水印的概念 .................................................................................................. 11 醫(yī)學(xué)圖像的特點(diǎn) ..................................................................................................... 12 數(shù)字水印 在醫(yī)學(xué)中的分類 ..................................................................................... 13 數(shù)字水印在醫(yī)學(xué)中的用途 ..................................................................................... 14 醫(yī)學(xué)水印所要研究的主要問(wèn)題 ............................................................................. 15 本章小結(jié) ....................................................................................................................... 15 3醫(yī)學(xué) 圖像 數(shù)字水印算法設(shè)計(jì)與實(shí)現(xiàn) ...................................................................... 16 設(shè)計(jì)算法的選擇 .......................................................................................................... 16 離散余弦交換 (DCT) ................................................................................................... 16 方案設(shè)計(jì) ...................................................................................................................... 18 離散余弦變換的水印嵌入 .......................................................................................... 19 離散余弦變換的水印提取 .......................................................................................... 20 主要 Matlab 函數(shù) ......................................................................................................... 21 水印的檢測(cè) .................................................................................................................. 22 嵌入水印的圖像效果圖 ......................................................................................... 22 魯棒性測(cè)試實(shí)驗(yàn) ..................................................................................................... 23 山東建筑大學(xué)畢業(yè)設(shè)計(jì)說(shuō)明書 II 實(shí)驗(yàn)結(jié)論及分析 ..................................................................................................... 25 本章小結(jié) ...................................................................................................................... 26 4總 結(jié) ................................................................................................................................ 27 謝 辭 ................................................................................................................................... 29 參考文獻(xiàn) ............................................................................................................................ 30 附 錄 ................................................................................................................................... 32 山東建筑大學(xué)畢業(yè)設(shè)計(jì)說(shuō)明書 III 摘 要 隨著數(shù)字化技術(shù)的發(fā)展，傳統(tǒng)的醫(yī)學(xué)圖像保存、分發(fā)介質(zhì)已由 膠片轉(zhuǎn)變?yōu)閿?shù)字圖像光盤、磁盤。因此，醫(yī)療影像及數(shù)據(jù)信息在網(wǎng)絡(luò)傳輸過(guò)程中同樣會(huì)遭遇篡改、非法復(fù)制、版權(quán)保護(hù)等信息安全問(wèn)題。保護(hù)醫(yī)學(xué)圖像的完整性和版權(quán)也是現(xiàn)代信息安全技術(shù)一個(gè)需要解決的問(wèn)題。本文主要對(duì)醫(yī)學(xué)圖像的版權(quán)保護(hù)方面進(jìn)行了研究。 本文結(jié)合現(xiàn)有的經(jīng)典水印算法，從離散余弦變換（ DCT）這種常用的數(shù)學(xué)變換入手進(jìn)行了研究。本文 DCT 數(shù)字水印算法是首先把圖像分成 88 的不重疊像素塊，在經(jīng)過(guò)分塊 DCT 變換后，即得到由 DCT 系數(shù)組成的頻率塊，然后隨機(jī)選取一些頻率塊，將水印信號(hào)嵌入到由密鑰控制選擇的一些 DCT 系數(shù)中。 實(shí) 驗(yàn) 證明，該算法滿足水印系統(tǒng)的要求。 本文對(duì)數(shù)字水印的攻擊方法以及數(shù)字水印的評(píng)價(jià)標(biāo)準(zhǔn)也作了詳細(xì)的論述，以更好地評(píng)價(jià)水印算法的特性。 關(guān)鍵詞 ： 數(shù)字水??；離散余弦變換；峰值信噪比；歸一化系數(shù) 山東建筑大學(xué)畢業(yè)設(shè)計(jì)說(shuō)明書 IV The Design on Digital Watermarking Algorithm of Medical Image ABSTRACT With the development of digital technology, traditional medicine images are saved, the distribution medium of film into digital images by CD, , medical imaging, and data transmission in the work will also encounter tampering, illegal copying, copyright protection and other information security protect the integrity of medical images and copyrights is a modern information security technologies need to be resolved. This paper focuses on copyright protection of medical images were studied. In this paper, bined with the existing classical watermarking algorithm, the discrete cosine transform (DCT) was studied by mathematical transformation of the monly used. DCT digital watermark algorithm is first the image is divided into 8 8 non overlaping pixels block, after block DCT transform, the frequency of DCT coefficient blocks, and then randomly selected some frequency block, to embed the watermark signal is controlled by the key choice of many of the DCT show that the algorithm satisfies the requirements of watermarking systems. Digital watermarking attack methods a