中文摘要：

提出了一种基于Hash函数和汉明码的分散式相关块半脆弱水印算法，用于图像完整性认证及内容篡改定位。将原始图像划分为互不重叠的块，进行多次Logistic混沌映射，定位每个块的相关块，得到汉明码编码需要的bit序列；进行汉明码编码，认证图像的完整性。实验结果表明，本文方案有较好的图像保护能力，能检测和定位各种恶意篡改，例如插入、模糊、锐化、对比度修改和爆裂位，能成功抵抗VQ攻击。

英文摘要：

A block-dependent semi-fragile watermarking scheme based on Hash function and Hamming code is proposed to authenticate the integrity of the image and localize the image tampers. The original image is firstly divided into non-overlapping blocks. Then the related blocks are localized by iterating the Logistic mapping,and then the bit string is got for Hamming code. Experimental results show that the proposed scheme has satisfactory protection ability and can detect and locate various malicious tampering, such as image insertion, burring, sharpening, contrast modification, and even though burst bits. Additionally,this scheme can successfully resist VQ attacks.