Watermark detection using adaptive color projections
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United States of America Patent
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Jul 4, 2006
Grant Date -
Jan 23, 2003
app pub date -
Jan 26, 2001
filing date -
Jan 26, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Matching the color axis of the watermark detector to the color direction used by the watermark embedder: A preferred projection axis is determined for each pixel. The preferred projection axis for each pixel is determined by examining the color values of the surrounding pixels in a selected area. Once the preferred projection axis for each pixel is determined the color values of that pixel are projected onto this axis to generate a set of values for each pixel. The watermark grid or data signal can then be detected from these values using known techniques.
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