一种新的基于DCT域的图像信息隐藏方法

A new DCT domain image anti shear steganography

为了避免经典扩频算法中因为嵌入强度减少导致虽隐蔽性得到提高,但秘密信息提取误差却变大的问题,本文提出一种新的图像隐藏扩频算法。基于DCT特性,若将秘密信息扩频嵌入载体图像的每个8×8维DCT系数矩阵的特定元素内,并根据嵌入位置的不同对隐秘图像作相应改换,就可提高扩频算法隐蔽性。仿真结果表明,基于DCT特性的扩频算法,不需要减少嵌入强度就可提高隐秘图像的峰值信噪比(PSNR)值。

In order to improve the anti-shear ability of the classical spread spectrum algorithm,this paper proposes an improved image anti-shear steganography.Based on the Discrete Cosine Transform(DCT)feature,the secret information is embedded in the specific position of the 8x8 dimensional DCT coefficient matrix of the carrier image through the spread spectrum algorithm,and the secret image is correspondingly transformed,leading to the improvement of the robustness and concealment of the spread spectrum algorithm.The experimental simulation test reveals that without reducing the embedding strength,the algorithm also can improve the Peak Signal to Noise Ratio(PSNR)of the secret image and the anti-shear ability of the algorithm.