Watermark placement in watermarking of time varying media signals
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United States of America Patent
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Aug 18, 2009
Grant Date -
Feb 19, 2004
app pub date -
Nov 19, 2002
filing date -
Aug 15, 2002
priority date (Note) -
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Abstract
A method of placing a watermark in a video stream estimates motion between frames in the video stream, and computes a representative motion for a frame. Before embedding the watermark in that frame, the method spatially adjusts a digital watermark by the representative motion. This method is particularly suited for embedding a watermark in a video stream compressed using motion estimation. In this case, the method uses the motion vectors in the video stream to compute a dominant motion for a frame, and then shifts the watermark by this dominant motion before embedding it in the frame.
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