结合2D Logistic映射与2D-DCT的数字图像隐藏技术

Digital Image Hiding Technology Combining 2D Logistic Mapping and 2D-DCT

为了应对日益增大的图像安全问题,提出一种结合二维Logistic映射与二维离散余弦变换(2D-DCT)的数字图像隐藏算法.首先,利用二维Logistic映射产生的混沌序列对秘密图像进行像素扩散与置乱,从而达到对秘密图像的加密效果.接着,分块对载体图像进行二维离散余弦变换,然后把扩散与置乱后的图像信息分存在变换后每块的右下角.最后再进行二维离散余弦反变换(2D-IDCT),并得到隐密图像.实验结果也表明,该算法安全可行且隐藏效果良好.

To cope with increasingly serious problems related to image security,this study proposes a digital image hiding algorithm based on two-dimensional(2D)Logistic mapping and 2D discrete cosine transform(2D-DCT).Firstly,the chaotic sequence generated by the 2D Logistic mapping is used to diffuse and scramble pixels of the secret image so that the secret image can be encrypted.Then,2D-DCT is performed on the host image in blocks,and the image information after diffusion and scrambling is stored in the lower right corner of each block after 2D-DCT.Finally,2D inverse discrete cosine transform(2D-IDCT)is carried out to yield the stego image.Experimental results also show that the proposed algorithm is safe,feasible,and effective in image hiding.