Abstract: To improve the precision of tamper location and the capability of resisting against JPEG compression, this paper presented a new image dual-watermarking scheme for both tamper detection and tampered image recovery. The basic principle of this scheme was to let the original image be performed by the 1-level discrete wavelet transformation. Then the authentication watermarking and self-recovery watermarking were respectively embedded into high-frequency and low-frequency component of original image. The experimental results show that the proposed scheme not only can detect and locate temper accurately, but also is robust to resist against JPEG compression.

Key words: self-embedded, dual-watermarking, tamper localization, wavelet transform, JPEG compress

摘要： 为了提高自嵌入水印算法篡改定位的精确度和抗JPEG压缩性能,提出了一种用于图像篡改定位和恢复的双水印算法。该算法对图像进行一级小波分解,分别在高频和低频分量中嵌入认证水印和自恢复水印。仿真实验表明,该算法不仅能对篡改区域实现精确定位,而且具有较好的鲁棒性,可以抵抗一定的JPEG压缩。

关键词: 自嵌入, 双水印, 篡改定位, 小波变换, JPEG压缩