鲁棒的密文彩色图像可逆数据隐藏方法

Robust reversible data hiding method for encrypted color images

为了提高现有密文图像可逆数据隐藏方法的不可感知性、鲁棒性和嵌入容量等问题,提出一种大容量密文彩色图像可逆数据隐藏方法.在发送端,首先利用Logistic混沌映射加密算法对彩色图像进行加密并分成RGB三个色彩通道,对其进行分块和二维离散余弦变换;然后选取鲁棒性较好的低频部分进行秘密信息的嵌入,提高算法的抗攻击性;最后采用像素互补的方法进行大容量的嵌入秘密信息.在接收端,先对得到的加密图像进行解密,根据信息嵌入的逆过程提取秘密信息并恢复原始图像.实验结果表明,该方法与现有方法相比在图像质量、嵌入容量、鲁棒性和加密性能等方面具有更好的性能,可自适应地选择嵌入容量.当嵌入容量达到1.15 bpp时,平均峰值信噪比可达到39.39 dB.

In order to improve the imperceptibility,robustness and embedding capacity of available reversible data hiding(RDH)in encrypted color images,a high capacity reversible data hiding method for encrypted color images was proposed.At its transmission end,firstly the color image was encrypted by logistic chaotic mapping encryption algorithm and separated into RGB three color channels,and the three channels were divided into blocks and processed by two-dimensional discrete cosine transform(2D-DCT).Then,its low-frequency region with better robustness was selected to embed secret information and its anti-attack performance was improved.Finally,pixel complementary method was adopted to embed large-capacity secret information.At the receiving end,the encrypted image was decrypted firstly and then the secret information was extracted and the original image was recovered by means of inverse process of information embedment.Experimental result showed that compared with the hiding methods available,the proposed method would have much better performance in connection with image quality,embedding capacity,robustness and encryption;and the embedding capacity could be adaptively selected.When the capacity reached to 1.15 bpp,the average value of peak signal-to-noise ratio would amount to 39.39 dB.