伪随机序列加密图像可逆信息分块隐藏仿真

Simulation of Reversible Information Block Hiding for Pseudo-random Sequence Encrypted Image

针对现阶段加密图像可逆信息隐藏方法无法实现信息分块隐藏,且信息容量低的问题,提出伪随机序列加密图像可逆信息分块隐藏方法。在图像加密过程中对图像进行Arnold变换,将变换次数设定为加密密钥,形成伪随机序列发生器,获取加密后的像素值,统计不同图像灰度级像素值数量,从上至下对图像像素进行排序。根据图像像素的分块以及分组方式形成各个图像块的差值直方图,同时使用加密时的密钥种子形成解密密钥。提取端引入可分离机制,共同完成加密信息的提取与图像解密处理,实现伪随机序列加密图像可逆信息分块隐藏。实验结果表明,所提方法能够有效提升信息容量,响应时间短,图像质量更好,具有较强的实用性。

At present,the hiding method cannot realize information block hiding.Therefore,a reversible information block hiding method of pseudo-random sequence encrypted image was proposed.In the process of image encryption,the image was transformed by Arnold transform,the transform times were determined as the encryption key,and then a pseudo-random sequence generator was formed to obtain the pixel values after encryption.In addition,the number of pixel values of different gray levels was calculated,and the image pixels were sorted from top to bottom.According to the blocks and grouping form of image pixels,the histogram of difference value of each image block was formed.Meanwhile,the decryption key was formed by seed keys.In extraction end,the separable mechanism was introduced to extract the encrypted information and decrypt the image.Finally,the reversible block hiding for pseudo-random sequence encrypted image was achieved.Simulation results show that the proposed method can effectively improve the information capacity and shorten the response time.Meanwhile,the image quality is better and the practicability is stronger.