一种DCT域稳健的彩色图像隐藏方法*

基于YCbCr色彩系统，提出了一种稳健的DCT域彩色图像隐藏方法，可以将一幅彩色图像隐藏在另一幅公开的彩色载体图像中，并与JPEG压缩标准相兼容。在嵌入过程中，通过对彩色图像各分量值进行合理分配和标志性嵌入，可以有效地克服DCT域秘密图像提取时的严重失真问题；并根据HVS特征和模糊理论对DCT图像块进行模糊分类，实现嵌入强度的自适应变化。实验结果表明，提出的方法对嵌入过程中产生的噪声具有很强的稳健性，恢复的秘密图像的像素值最大失真误差在±1之内，在保证隐秘图像视觉质量的前提下，载体图像具有较大的数据隐藏量。

Robust Color Image Hiding Method in DCT Domain

This paper presents a robust color image hiding method based on YCbCr color system in DCT domain, which can hide a secret color image behind a public color cover image and is compatible with the international image compression standard of JPEG. To overcome the grave distortion problem in the restored secret image, this paper proposes a new embedding scheme consisting of reasonable partition of a pixel value and sign embedding operation for each component of a color image. Moreover, based on Human Visual System (HVS) and fuzzy theory, this paper also presents a fuzzy classification method for DCT sub blocks to realize the adaptive selection of the secret data embedding intensity. The experimental results show that the proposed color image hiding method is a robust image hiding approach in DCT domain and the maximum distortion error in pixel value for the extracted secret image is ±1. And the color cover image can provide good quality after embedding larger amount of data.