摘要：

提出一种基于斜变换的半脆弱彩色图像水印算法。该算法可以嵌入认证和恢复2种水印，实现图像的归属认证和篡改区域的恢复。把认证水印嵌入在经斜变换后的绿色分量中，将压缩图像的斜变换系数作为恢复水印嵌入在各个分量的最末位。在图像遭受篡改时，通过提取各分量的最末位实现图像的自恢复。理论分析和实验结果表明，该算法不仅能检测篡改区域还能近似恢复被篡改的图像，在保证透明性的前提下具有较好的鲁棒性。

关键词: 图像置乱, 信道编码, 斜变换, 半脆弱, 彩色图像, 图像恢复

Abstract:

This paper proposes an algorithm that can authenticate image and restore tampered region by embedding the authentication watermark and restore watermark. Authentication watermark is embedded in the region of green component by slant transformed. The compressed and slant transformed coefficients as restore watermark are embeded into the least significant bit of each component. If the image is suffered tamper, the last bit of each component can also extract to achieve the image of the self-recovery. Theoretical analysis and experimental results show that under the premise of ensuring transparency and good robustness, the algorithm not only can detect the tampered area but also can restore the tempered region approximation.

Key words: image scrambling, channel coding, slant transform, semi-fragile, color image, image restoration

中图分类号: 

• TP391