Color selection scheme for digital video watermarking
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United States of America Patent
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Dec 8, 2009
Grant Date -
Mar 31, 2005
app pub date -
Sep 29, 2003
filing date -
Sep 29, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
Determining a chrominance portion to be watermarked employs a perception-based table that indicates for various pixel values which of the chrominance portions, if any, should be selected for watermarking. Only the Y, U, and V values of a pixel are needed to access the table and determine which chrominance portion should be selected. However, the table may be represented such that it may be accessed using only R, G, and B values. The table may be modified so that it may indicate which of U or V should be selected, or that neither should be selected, indicating that this pixel should not be watermarked at all. Advantageously, the table may be simplified by employing some processing, because a large section of the table may be replaced by a simple test on the pixel values, e.g., U<128, to determine the selected chrominance portion.
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