基于曲面插值的加密图像可逆信息隐藏算法

摘要

提出一种基于曲面插值的加密图像可逆信息隐藏算法.对原始图像进行加密,利用随机函数确定加密图像中的载体像素,根据载体像素取反位的不同采取不同的隐藏方法.对载密图像进行解密以确定载体像素,在载体像素5×5邻域中选取与载体像素距离最近的6个非载体像素,采用曲面插值的方法计算载体像素的预测值,应用该预测值提取秘密信息并恢复载体像素.实验结果表明,该算法提取秘密信息的错误率较低,恢复图像的视觉效果较好.%This paper proposes a reversible information hiding method for encrypted images by means of surface interpolation.An original image is encrypted firstly,then a random function is used for obtaining the cover pixels in the encrypted image.Different hiding methods are adopted in accordance with the different inverted bits in the cover pixeis.The stego-image is decrypted and the cover pixels are obtained.In the 5 × 5 neighborhood of a cover pixel,six non-cover pixels which are closet to the cover pixel are selected.Then surface interpolation is applied to calculate the predicted value of the cover pixel.The predicted value is used for extracting secret data and recovering the original pixel.The experimental results indicate that this method performs with a lower error rate in secret data extraction and a higher visual quality in image recovery.