Spatio-temporal channel for images employing a watermark and its complement
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United States of America Patent
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May 13, 2003
Grant Date -
Mar 7, 2002
app pub date -
Mar 9, 2001
filing date -
Sep 7, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A channel is inserted into a sequence of frames for an image, by varying one or more display characteristics across a display in accordance with a spatio-temporal pattern applied to, for example, successive lines of each modified frame. The channel may be employed to watermark the image, and the watermark may be defined as W(x) and its complement [1-W(x)] in counter-phase rotations of successive lines in pairs of frames. The watermark information is applied in relatively still portions of the image with sufficient lightness level. A receiver includes a watermark detector that has a priori information about the watermark. The watermark detector examines specific regions of the displayed image over time, and tests the regions for the watermark during time intervals when the image remains relatively still.
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