A system and method for efficient recovery of watermarks from compressed
video is disclosed, wherein, in one embodiment, cyclic watermark noise
blocks are tiled and embedded in a plurality of frames of compressed
video, quantized coefficients are computed for a group of compressed
video frames on a pixel-by-pixel basis, the scaled coefficients for the
group of compressed video frames are summed into an output transform
frame, and the entire summed output transform frame is transformed to
recover peak values for the group of compressed video frames to recover
the watermark. Additionally, zero band normalization and edge filtering
are also provided to increase the accuracy and efficiency of recovering
watermarks from video frames.