抗JPEG压缩的半脆弱水印算法

Semi-fragile watermarking algorithm resisting to JPEG

基于JPEG压缩过程的特性,提出了一种能抵抗JPEG压缩的半脆弱盲检水印算法,并给出了理论论证。该算法利用不重叠图像块的DCT变换系数之间的大小关系,选择图像特征作为水印信息进行嵌入。理论分析和实验结果表明,该算法的水印具有很好的抵抗JPEG压缩的能力,并且对剪切、篡改等恶意攻击有很好的篡改定位能力。

Based on the characteristic of JPEG compression process,a blind semi-fragile watermarking algorithm is proposed,which performs well in JPEG compression.The algorithm adjusts little of the original image,and with the relationship between the DCT coe-fficients of different image blocks,it can extract image features which are little infected by JPEG compression.Experiments and theoretic analysis demonstrate good performance in the ability of resisting JPEG compression and localizing tampered areas.