基于分块旋转的加密图像可逆信息隐藏算法

结合加密技术和信息隐藏理论,提出了一种新的加密图像可逆信息隐藏算法.首先用加密密钥对图像进行加密,然后将图像分块并随机生成模板矩阵,模板矩阵通过旋转不同的角度对应不同形态的嵌入数据,以实现信息隐藏功能,同时在嵌入容量上得到提升.对包含额外信息的加密图像,先用加密密钥对图像进行解密,得到一幅与原始图像近似的解密图像,针对现有算法未考虑边界像素对分块空间相关性的贡献,设计了更合理的波动函数,从而降低了提取额外信息的错误率并完整恢复原始图像.实验结果表明,该算法在嵌入容量和降低错误率方面均有较好的提升.

Reversible Information Hiding in Encrypted Image Based on Block Rotation

With the encryption technology and information hiding theory,a new reversible data hiding scheme in encrypted images is proposed.The proposed scheme firstly encrypts the original image by encryption key,and then divides the encrypted image into blocks and generates a template matrix randomly.Data hiding processing with higher capacity can be performed by the template matrix with multiple rotation angles.Aiming at an encrypted image containing additional data,the proposed scheme decrypts it to obtain a version that is similar to the original image.Since previous methods do not fully exploit the border pixels in calculating the spatial correlation,the proposed scheme designs a more accurate fluctuation measurement.The embedded data can be successfully extracted and the original image can be perfectly recovered.Experimental results show that the proposed work has better performance in capacity and error rate of extraction than that of other methods.