Video steganography algorithm based on the relative relationship between DWT coefficients

H.264 is the commonly used standard for video compression, and is a lossy compression standard. This paper proposes a video steganography algorithm resisting to H.264 compression based on the relative relationship of DWT (Discrete Wavelet Transform) coefficients, which reduces the changes to individual coefficients. Firstly, the change of the low-frequency DWT coefficient difference between adjacent frames of video before and after H.264 compression is analyzed. Then, an appropriate coefficient difference threshold is selected according to the analysis result. Finally, the secret message bits are embedded by modulating the difference between the low-frequency DWT coefficients of adjacent frames. The experimental results show that the proposed algorithm can maintain high quality of the stego video, and resist to the H.264 compression well.