Content based digital watermarking using wavelet based directionality measures
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United States of America Patent
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Issued Date -
Apr 10, 2003
app pub date -
Sep 28, 2001
filing date -
Sep 28, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A perceptual masking method for digital watermarking identifies areas of dominant orientation within an image and modifies the watermark gain for those regions. The perceptual masking model computes local contrast and measures directionality of image features in small neighborhoods using a standard wavelet filter set and a rotated wavelet filter set to determine if the regions are highly oriented in one direction. The watermark strength gets suppressed if the corresponding area has high contrast and high directionality measure, while the gain reaches the maximum when the area has high contrast and low directionality measure.
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