基于DWT的图像内容半脆弱水印认证算法  

Image Content Semi-fragile Watermarking Authentication Algorithm Based on DWT

作　　者：张劲松[1] 杨玫[1] 周立新[1] 

机构地区：[1]中国地质科学院岩溶地质研究所,广西桂林541004

出　　处：《科技通报》2017年第6期192-195,共4页Bulletin of Science and Technology

摘　　要：半脆弱水印因为在多媒体内容认证方面的重要作用而受到人们密切的关注。为了能够区分偶然攻击与恶意篡改,半脆弱水印需要对一般的内容保护图像操作有一定的鲁棒性。本文提出了一种新的基于DWT变换的半脆弱水印算法,该算法思想首先对图像进行一层DWT小波变换,再把图像变换出的高频系数部分(LH1和HL1)进行分块,然后分别算出每小块的能量值,根据能量值大小关系嵌入水印。仿真实验结果表明,该算法特别在JPEG压缩方面有较好的鲁棒性,另外算法具有精确的定位检测能力,算法整体性能较好。Semi-fragile watermarking because of the important role in multimedia content authentication and close attention by people. In order to be able to distinguish between accidental attacks and malicious tampering, semi-fragile watermarking need to general image content protection operation has certain robustness. This paper proposes a new semi-fragile watermarking algorithm based on DWT transform,this algorithm firstly to a layer of DWT wavelet transform of the image, in the image transform high frequency coefficients of the block(LH1 and HL1), and then figure out each small piece of the energy value of respectively, according to the size of the energy relationship between embedded watermark. The simulation experimental results show that the algorithm is of good robustness, especially in terms of JPEG compression, another algorithm has precise positioning detection ability, algorithm performance is better.

关 键 词：半脆弱水印 DWT JPEG 鲁棒性 小波变换 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]