DETECTION OF A WATERMARK IN A COMPRESSED VIDEO SIGNAL

摘要

A method and arrangement for detecting a watermark embedded in an MPEG compressed signal are disclosed. A conventional MPEG decoder is stripped to such an extent that a modified baseband video signal suitable for watermark detection is obtained. In accordance with the invention, a plurality of pictures with the embedded watermark is accumulated (2, 3, 4) in the transform domain, and the inverse DCT (5) is applied to the accumulated result. Conventional watermark detection (6) is then applied to the accumulated plurality of pictures in the spatial domain.