基于拉格朗日分存的彩色图像隐写算法

摘要

为提高彩色数字图像隐写算法的安全性,提出一种基于拉格朗日分存原理的隐写算法.秘密图像在置乱之后被转换成二进制比特流,彩色载体图像根据RGB通道分解为3幅灰度图像,利用拉格朗日分存算法,每个通道的灰度图像先分存为3幅图像再合并成一幅图像,秘密信息在载体图像合并的过程中被嵌入到载体图像中,根据载体图像每个像素点分存之后的奇偶性进行秘密信息的嵌入.仿真结果表明,该隐写算法具有较高的抗裁剪性、安全性及隐秘性.%To improve the security of steganography in color digital image, a steganography algorithm based on Lagrange sharing algorithm was improved.Security image was converted into binary stream after the image was scrambled.Color cover image was decomposed into three gray images according to RGB channel.The gray image of every channel was shared into three images using Lagrange sharing algorithm and then three shared images were merged into an image.The security information was embedded in the process of cover image combination.Security information was embedded into cover image according to the parity of every shared pixel of cover image.Results of simulation show that the proposed steganography algorithm has good abilities of cropping-resisting, securing and hiding.