用多重菲涅耳衍射变换实现盲信息隐藏

提出了一种新的基于多重菲涅耳衍射变换和像素替代的盲信息隐藏算法.需隐藏的图像经多重菲涅耳衍射变换为一密文复矩阵,然后将其实部和虚部分别嵌入到原始宿主图像中,同时将此已嵌入信息的原像素值用其近邻的未嵌入信息的像素均值来替代,从而实现盲信息隐藏.数值仿真计算结果表明:该隐藏算法对JPEG有损压缩、图像剪切,噪声污染、重采样攻击和亮度、对比度、直方图、灰度曲线调整等具有一定的抵抗能力;由于采用一系列加密密钥(光波长、透镜焦距,多个衍射距离等),只有当所有密钥都正确时,才能解密恢复所隐藏的信息,所以该算法具有较强的鲁棒性和很高的安全性.

Blind information hiding technique using multiple Fresnel diffraction transforms

A new blind information hiding algorithm was proposed using Multiple Fresnel Diffraction Transforms (MFDTs) and pixel replacement. The hidden image was transformed into a cipher-text complex matrix with MFDTs. The real and imaginary parts of the cipher-text complex matrix were embedded in the different positions of the host image respectively, and meanwhile the value of the embedded pixel in the original host image was replaced by the average value of its adjacent pixels which were not modified, and thus the blind information hiding was realized. Numerical experiments show that the algorithm is robust to the attacks of the JPEG lossy compressing, cropping, superposing noise and resampling from the screen copy, and it is also robust to the modifications of brightness, contrast, histogram and gray curve of the host image. The encryption keys of MFDTs are optical wavelength, focus length of lens, many diffraction distances, and the hidden image is decrypted correctly only when the all keys are correct. Therefore, the algorithm has strong robustness and high security.