Method and apparatus for decomposing an image stream into units of local contrast
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United States of America Patent
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Jun 1, 1999
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N/A
app pub date -
Mar 28, 1997
filing date -
Mar 29, 1996
priority date (Note) -
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Abstract
An apparatus and concomitant method for decomposing an image stream into units of local contrast. A temporal contrast transform (pyramid), comprises a spatial filter, a cascade of lowpass temporal filters and a plurality of subtractors and dividers. The spatial filter is followed by a cascade of lowpass temporal filters, producing a set of temporally lowpass, spatially low pass images. Adjacent filter outputs are then subtracted, producing a set of temporally bandpass (Laplacian) images. Finally, each Laplacian image is divided by a lower level temporal lowpass image, to produce a set of temporally bandpass contrast images.
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