现代计算机（普及版）
現代計算機（普及版）
현대계산궤（보급판）
MODERN COMPUTER
2014年
2期
23-27,40
,共6页
哈达玛变换%脆弱水印%Logistic混沌映射
哈達瑪變換%脆弱水印%Logistic混沌映射
합체마변환%취약수인%Logistic혼돈영사
Hadamard Transform%Fragile Watermarking%Logistic Chaotic Theory
传统的水印算法，通常使用小波变换对原始图像进行变换。对于复杂图像被篡改，直接的小波变换很难识别。为了准确地定位被篡改的复杂图像，提出一种基于哈达玛变换与混沌理论的脆弱水印算法。该算法首先对图像进行4×4分块，计算每一块的标准差，利用标准差小数部分和水印密钥合成为Logistic混沌映射初值生成脆弱水印。然后将脆弱水印嵌入到哈达玛变换域的直流分量中。图像认证时，不需要原始图像。实验结果表明，对于复杂图像该算法能够检测恶意篡改并进行篡改定位，是一种行之有效的图像鉴别方法。
傳統的水印算法，通常使用小波變換對原始圖像進行變換。對于複雜圖像被篡改，直接的小波變換很難識彆。為瞭準確地定位被篡改的複雜圖像，提齣一種基于哈達瑪變換與混沌理論的脆弱水印算法。該算法首先對圖像進行4×4分塊，計算每一塊的標準差，利用標準差小數部分和水印密鑰閤成為Logistic混沌映射初值生成脆弱水印。然後將脆弱水印嵌入到哈達瑪變換域的直流分量中。圖像認證時，不需要原始圖像。實驗結果錶明，對于複雜圖像該算法能夠檢測噁意篡改併進行篡改定位，是一種行之有效的圖像鑒彆方法。
전통적수인산법，통상사용소파변환대원시도상진행변환。대우복잡도상피찬개，직접적소파변환흔난식별。위료준학지정위피찬개적복잡도상，제출일충기우합체마변환여혼돈이론적취약수인산법。해산법수선대도상진행4×4분괴，계산매일괴적표준차，이용표준차소수부분화수인밀약합성위Logistic혼돈영사초치생성취약수인。연후장취약수인감입도합체마변환역적직류분량중。도상인증시，불수요원시도상。실험결과표명，대우복잡도상해산법능구검측악의찬개병진행찬개정위，시일충행지유효적도상감별방법。
The original image is typically used to transform by wavelet transform in the traditional watermarking algorithm. If complex images has been tampered with, the directly wavelet transform is difficult to identify. In order to accurately locate the complexity of the image has been tampered, proposes a fragile watermarking algorithm based on hadamard transform and chaos theory. In this method, original image is firstly divided into 4 ×4 blocks, calculates the standard deviation of each block, combines the fractional part of the standard deviation and a watermarks key as the initial value of logistic maps for the generation of the fragile watermarks. Embeds the fragile watermark into the hadamard transform domain in the DC component. Image authentication have not the original image. Experimental results show that the algorithm is an effective method of identifying complex images.
