Time-axis based video watermarking resisting to geometrical attacks

In this paper a video watermarking scheme that can resist to geometrical attacks is proposed. The message is modulated by the key-dependent pseudo-random sequences to produce a CDMA signal. This signal is embedded into the cover video by modifying the variance of every frame of the sequence. In watermark detection process variance of every frame of stegovideo sequence is calculated. The CDMA signal is estimated from the preprocessed variance sequence and the message is extracted by correlation detection. Experimental results show the scheme is very robust to geometrical attacks.