Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2002-11-19
2009-08-18
Moazzami, Nasser G (Department: 2436)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C283S113000, C283S072000, C726S029000, C725S020000, C725S022000, C358S003280, C382S240000, C382S100000
Reexamination Certificate
active
07577841
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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Digimarc Corporation
Moazzami Nasser G
Shiferaw Eleni A
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