A Steganographic Algorithm in Uncompressed Video Sequence Based on Difference between Adjacent Frames

A steganographic algorithm for embedding secret bits into uncompressed video sequence was proposed in this paper. The difference between adjacent frames, which is called motion component, indicates the motion of video, and is not obviously affected by video compression. So motion component was used to embed secret bits for increasing the capability of resisting video compression. Motion component was firstly calculated on a frame by frame basis, and then it was two-level wavelet decomposed, and the secret bits were embedded into wavelet coefficients. For the purpose of little degrading video quality, the secret bits were only embedded into low frequency coefficients that within the region which has large moving speed. Experimental results show that the proposed algorithm not only can keep a good visual and statistical imperceptibility, but also has a considerable embedding capacity. Moreover, the algorithm has a good flexibility to MPEG encoding. Even after MPEG encoding, the secret bits can be extracted with a high accuracy.