基于差值扩展和纠错编码的可逆图像认证

针对一些敏感数字图像在认证水印嵌入过程中不能引入失真的问题,提出一种能够定位图像篡改块的可逆图像认证方案,利用纠错编码使认证数据能抵抗可能受到的篡改攻击,并用差值扩展的方式将编码后的认证数据嵌入到图像中。仿真实验结果表明,若认证通过,则图像可完全恢复到原始状态,否则,图像中篡改的块可被定位,并完全恢复其他未篡改的区域。

Reversible Image Authentication Based on Difference Expansion and Error Correction Code

Aiming at the problem that some sensitive digital images can not bring in inevitably distortion in the process of authentication data embedding, a reversible image authentication scheme with tampering localization is proposed. In this scheme, authentication data is encoded using error correction code to prevent them from malicious manipulation and difference expansion is exploited to conceal the encoded data into image. Simulation experimental results demonstrate that if the image is authentic, the distortion due to embedding can be completely removed from the original state, otherwise, the tampered blocks can be located and other areas can be restored.