计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2009年
31期
172-174,177
,共4页
Turbo码%混沌%扩频%离散余弦变换
Turbo碼%混沌%擴頻%離散餘絃變換
Turbo마%혼돈%확빈%리산여현변환
Turbo-codes%chaotic%spread spectrum%Discrete Cosine Transform (DCT) transform
提出了一种基于logistic混沌映射和Turbo码相结合的多水印算法,利用扩频技术在一个图像上嵌入多个二值图像来代表不同信息.该算法利用Turbo码优异的纠错性能和扩频通信的多址技术,并根据人眼视觉特性,将经过混沌加密、Turbo码编码并使用不同的混沌序列扩频的水印嵌入到DCT变换系数的中频中.对算法在多种攻击下进行了仿真.实验结果表明,利用该算法实现的水印具有良好的不可见性和鲁棒性.
提齣瞭一種基于logistic混沌映射和Turbo碼相結閤的多水印算法,利用擴頻技術在一箇圖像上嵌入多箇二值圖像來代錶不同信息.該算法利用Turbo碼優異的糾錯性能和擴頻通信的多阯技術,併根據人眼視覺特性,將經過混沌加密、Turbo碼編碼併使用不同的混沌序列擴頻的水印嵌入到DCT變換繫數的中頻中.對算法在多種攻擊下進行瞭倣真.實驗結果錶明,利用該算法實現的水印具有良好的不可見性和魯棒性.
제출료일충기우logistic혼돈영사화Turbo마상결합적다수인산법,이용확빈기술재일개도상상감입다개이치도상래대표불동신식.해산법이용Turbo마우이적규착성능화확빈통신적다지기술,병근거인안시각특성,장경과혼돈가밀、Turbo마편마병사용불동적혼돈서렬확빈적수인감입도DCT변환계수적중빈중.대산법재다충공격하진행료방진.실험결과표명,이용해산법실현적수인구유량호적불가견성화로봉성.
In this paper,an image multi-watermark algorithm based on the combination of Logistic chaotic mapping and Turbo code is proposed.After that,difference information can be represented by binary images embedded in an image through the spread spectrum technology.By the excellent error-correcting of Turbo code and spread spectrum communication technology, the watermark is embedded in the DCT coefficients mid-frequency,which is encrypted by chaotic,coded by Turbo code and spread spectrum by difference Chaotic sequences,in accordance with the visual characteristics of the human eye.At the same time,the algorithm under several attack has been simulated in the paper.The experimental results show that the algorithm is good at invisibility and robust on implementating the watermark.