电脑与电信
電腦與電信
전뇌여전신
Computer & Telecommunication
2015年
8期
23-26
,共4页
图像认证%篡改定位%混沌系统%脆弱水印
圖像認證%篡改定位%混沌繫統%脆弱水印
도상인증%찬개정위%혼돈계통%취약수인
image authentication%tamper location%chaotic system%fragile watermarking
数字水印是一种用于数字产品版权保护的信息隐藏技术。本文提出一种基于混合视觉双稳态置乱系统的脆弱性数字水印算法。该算法将图像分块，由各块亮度值确定混沌序列长度及嵌入深度，将各点位置信息、最高有效位颜色信息以及自定义的密钥作为混沌系统的初值，各块不同深度地将水印序列嵌入图像各点的R、G、B分量中；在检测定位时，比较提取的水印和生成的水印，直接得到差异图像。实验结果表明，使用该方法嵌入水印后图像质量高，且篡改定位能力强。
數字水印是一種用于數字產品版權保護的信息隱藏技術。本文提齣一種基于混閤視覺雙穩態置亂繫統的脆弱性數字水印算法。該算法將圖像分塊，由各塊亮度值確定混沌序列長度及嵌入深度，將各點位置信息、最高有效位顏色信息以及自定義的密鑰作為混沌繫統的初值，各塊不同深度地將水印序列嵌入圖像各點的R、G、B分量中；在檢測定位時，比較提取的水印和生成的水印，直接得到差異圖像。實驗結果錶明，使用該方法嵌入水印後圖像質量高，且篡改定位能力彊。
수자수인시일충용우수자산품판권보호적신식은장기술。본문제출일충기우혼합시각쌍은태치란계통적취약성수자수인산법。해산법장도상분괴，유각괴량도치학정혼돈서렬장도급감입심도，장각점위치신식、최고유효위안색신식이급자정의적밀약작위혼돈계통적초치，각괴불동심도지장수인서렬감입도상각점적R、G、B분량중；재검측정위시，비교제취적수인화생성적수인，직접득도차이도상。실험결과표명，사용해방법감입수인후도상질량고，차찬개정위능력강。
Digital watermarking is a kind of technology of hiding technology which is used to protect the copyright of digital products. In this paper, a new fragile digital watermarking algorithm based on hybrid visual bistable system is proposed. It divides the image into non-overlapped blocks, calculates the luminance of each block to decide the embedding depth and the length of chaot-ic sequence. For each pixel, an initial value is determined based on its prominent chrominance value, the position index, and the im-age protection key. Watermarking sequence is embedded into the embedding space of R,G,B respectively. Then it detects the temper by comparing the extracted watermarking and the produced one, until the error image is attained. Theoretical analysis and experi-ment result show that this algorithm is in high quality and locates the tamper position exactly.
