Method and apparatus for edge detection
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United States of America Patent
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Mar 1, 2005
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N/A
app pub date -
Aug 16, 2000
filing date -
Jan 12, 2000
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Abstract
An edge detection technique combines a low-pass second derivative of an image signal, a low-pass first derivative of the image signal, and an estimation of edge frequency. The edge frequency estimation is preferably based on a ratio of a third to a first low-pass derivative of image signal. The image signal is preferably a luminance signal.
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