基于自嵌入水印算法的彩色图像篡改恢复

Color image tamper detection and recovery based on self-embedding watermarking scheme

提出了一种用于实现彩色图像篡改后图像检测和恢复的自嵌入水印算法。图像信息生成认证比特和恢复比特作为水印被嵌入原图像。认证比特通过提取图像块经过哈希变换后的特征值生成;恢复比特通过提取图像块的压缩编码得到。通过比较图像块中提取的哈希值和被嵌入水印中的认证比特,可以判断图像是否被篡改,如果图像块被篡改则可以通过提取水印中的恢复比特用于图像块的恢复。实验结果表明该算法有效性高,具有检测彩色图像是否被篡改的能力,并实现篡改图像的恢复。

In this paper,a novel self-embedding watermarking scheme is presented for color image tamper detection and recovery.Authentication bits and recovery bits are embedded into the original host image to realize tamper localization and content restoration.The authentication bits are generated by extracted image feature value and constructed hashing value;the recovery bits are generated by extracted block-based compressed code.The tamper of test image block is determined by comparing the hash value of image block with the extracted authentication bits.The tampered image block can be recovered by the extracted recovery bits.The experimental results show that the proposed schemes can effectively realize the tamper detection and recovery of color image.