自适应的密文彩色图像可逆数据隐藏算法

为了提高直方图平移算法嵌入率和图像感知质量,提出一种自适应的密文彩色图像可逆数据隐藏算法。利用Logistics混沌置乱加密算法对彩色图像进行加密;对加密后的图像块根据设定的波动阈值自适应地分成平滑块和陡峭块;对平滑块进行高平面位比特替换,对陡峭块进行直方图平移和多比特位嵌入来提升嵌入率和图像质量。实验结果表明,该算法具有较高嵌入容量且感知质量较好,当嵌入率为1.142bpp时,峰值信噪比可达35dB以上,并且抵抗噪声、剪切攻击时鲁棒性较好。

ADAPTIVE REVERSIBLE DATA HIDING ALGORITHM OF CIPHERTEXT COLOR IMAGE

In order to improve the embedding rate and image perceptual quality of histogram shifting algorithm,this paper proposes an adaptive reversible data hiding algorithm of ciphertext color image.It used Logistics chaotic scrambling encryption algorithm for color image.The encrypted image blocks were adaptively divided into smooth blocks and steep blocks according to the set fluctuation threshold.Then,the smooth block was replaced by high plane bits,and histogram shifting was performed on the steep block to embed several bits to improve the embedding rate and image quality.The experimental results show that the proposed algorithm has higher embedding capacity and a good perceptual quality.When embedding capacity is 1.142 bpp,the peak signal-to-noise ratio can reach more than 35 dB,and it has a good robustness against noise and shear attacks.