Image analysis – Applications
Patent
1997-09-12
2000-08-22
Boudreau, Leo H.
Image analysis
Applications
G06K 900
Patent
active
061084344
ABSTRACT:
Detection of a watermark in blocks of video or image data which has been subjected to affine geometric distortion is accomplished by approximating the distortion by a spatially varying translation of the blocks. The watermark is extracted by spatial translations of the blocks based on an assumed affine geometric distortion. The extracted watermarks are correlated with possible watermarks and the maximum correlator output is tested for statistical significance in order to determine whether a watermark is present in the image or video frame. The data may be compressed or uncompressed data. If the affine geometric distortion is known, a search for the maximum correlator output over a space of possible distortions can be performed.
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Cox Ingemar J.
Miller Matthew L.
Boudreau Leo H.
Feig Philip J.
Novik Dmitry A.
Signafy, Inc.
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