摘要： 结合离散余弦变换(DCT)的能量压缩能力和离散小波变换(DWT)的多分辨率特性，提出一种基于准三维变换的视频隐写算法。该算法利用二维小波变换描述视频序列的帧内信息，通过一维离散余弦变换描述视频序列的帧间信息，从而有效利用视频序列的空间及时间冗余，将秘密信息嵌入在DCT系数的量化过程中，保证了视频序列的稳定性及秘密信息提取的准确性。实验结果表明，该算法具有较好的视觉不可见性与较高的嵌入容量，且可实现秘密信息的盲提取。

关键词: 视频隐写, 离散小波变换, 离散余弦变换

Abstract: Combination of Discrete Cosine Transform(DCT) energy compression and multiresolution characteristics of Discrete Wavelet Transform(DWT), this paper presents a video steganography algorithm based on quasi3D DWT/DCT. The algorithm uses 2D DWT to depict intraframe information and uses 1D DCT to depict interframe information of the video sequence，and redundancy data in time and space domain are efficiently used accordingly. During the quantify process, secret message is embedded into coefficients in DCT domain. Experimental results demonstrate that the algorithm not only is imperceptible and has large embedding capacity, but also can extract the secret message without using the original video.

Key words: video steganography, Discrete Wavelet Transform(DWT), Discrete Cosine Transform(DCT)

中图分类号: 

• TP391