Embedding and detecting a watermark in images
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United States of America Patent
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-
Mar 2, 2004
Issued Date -
N/A
app pub date -
Jan 19, 2001
filing date -
Jan 9, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A digital image signal is watermarked by locally changing geometric features of the image. The watermark consists of a pseudo-random, dense subset of image pixels, e.g., a pattern of lines (20). A number of significant image pixels (21,22,23), i.e., pixels which give the highest response to a predetermined processing operation, is determined and then moved (24) to the vicinity (.delta.) of the line pattern. As a result of this 'warping', the majority of significant image pixels (21,22) is eventually located within the vicinity of the line pattern. At the receiver end, the most significant pixels of an input image are again determined. The image is a watermarked image if a statistically high percentage lies within the vicinity of the line pattern.
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