基于数据报重组与光学干涉的密文多图像可逆信息隐藏

Ciphertext Multi-image Reversible Information Hiding Based on Datagram Reorganization and Optical Interference

针对现有可逆信息隐藏嵌入率低,无法一次隐藏多张不同图像问题,提出一种密文域光学多图像可逆信息隐藏方法。将多张不同类型、不同大小图像进行数据报重组得到重组多图像,无需提供任何信息可在一定噪声下重构多图像。载体图像经非对称双随机相位编码得到加密图像,再将重组多图像光强缩小1000倍,与加密图像级联干涉得到载密图像,利用级联矢量分解可从载密图像中无损还原重组多图像和加密图像。载密图像可用解密密钥进行解密,也可用隐藏密钥无损还原重组多图像,当同时具有解密密钥与隐藏密钥时可无损还原载体图像,实现完全可逆、可分离。实验表明,当嵌入率为128比特/像素时,载密图像峰值信噪比大于32 dB,且可无损还原隐藏图像与载体。在1/2剪切或0.2的各种噪声下,各还原图像峰值信噪均大于11 dB,具有鲁棒性。3 s内可实现32比特/像素的嵌入、还原和解密,具有高效性。

Aiming at the problem that the existing reversible information hiding has a low embedding rate and can not hide multiple different images at once.An optical reversible information hiding method for multiple images in ciphertext domain is proposed.Multiple images of different types and sizes are reconstructed by datagram.Multiple images can be reconstructed under certain noise without providing any information.The carrier image is encoded with asymmetric double random phase coding to obtain an encrypted image.Then the light intensity of the recombined multi-image is reduced by 1000 times,and it cascade interference with the encrypted image to obtain the carrying secret image.Using cascaded vector decomposition,multiple images and encrypted images can be restored losslessly from encrypted images.The carrying secret image can be decrypted with the decryption key,or hidden key can lossless restore reassemble multiple images from carrying secret image.The carrier image can be restored lossless when both the decryption key and the hidden key are available.Realize completely reversible and separable.The experiment shows:When the embedding rate is 128 bits/pixel,the peak signal-to-noise ratio of the carrying secret image is greater than 32 dB.Hidden images and carriers can be restored lossless.Under clipping 1/2 or various noises of 0.2,the peak signal-to-noise ratio of each extracted and restored image is greater than 11 dB,has good robustness.32 bits/pixel can be embedded,extracted and decrypted within 3 s,which is highly efficient.