抗JPEG压缩并精确定位篡改自嵌入水印算法

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。

Self-embedded watermarking algorithm for precise image tamper location against JPEG compression

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.