Efficient extraction of embedded watermarks in the presence of host content distortions
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United States of America Patent
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Mar 25, 2014
Grant Date -
May 9, 2013
app pub date -
Nov 3, 2011
filing date -
Nov 3, 2011
priority date (Note) -
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Abstract
Methods, devices and computer program products facilitate the extraction of embedded watermarks in the presence of content distortions. Coarse estimates of a distortion or combination of distortions, present in the host content are obtained by detecting a tentative watermark, or a portion thereof, utilizing coarse pre-distorted watermark templates. Supplementary pre-distorted watermark templates are then selected in the neighborhood of the coarse distortion estimate to further re-evaluate the tentative watermark. The use of coarse and supplementary pre-distorted watermark templates results in obtaining better estimations of content distortions, and improved reliability of watermark detections in an efficient manner.
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