A new geometric invariant video watermarking method is proposed based on DCT feature blocks that can satisfy the real-time embedding requirement. In the algorithm

certain number of DCT feature blocks are selected as the embedding points. The synchronization block is calculated accordingly for frame registration before detection is conducted. On the detection side

the feature blocks are firstly extracted for the localization of the synchronization block. And then neighborhood search is implemented on the synchronization block to accurately estimate the geometric distortion. After the frame registration

feature blocks are extracted again for the final watermark detection. Experimental results show that the watermarking system can resist to geometric attacks well with satisfying good invisibility

real-time and security properties.