Apparatus and method for signal dependent noise estimation and reduction in digital images
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United States of America Patent
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Jul 13, 1999
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N/A
app pub date -
Mar 24, 1997
filing date -
Apr 4, 1996
priority date (Note) -
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Abstract
The present invention efficiently and quickly estimates signal (code value) dependant noise in an image and subsequently reduces that noise. The digital image is segmented both according to code value and into smooth vs. textured regions. Noise estimates taken from smooth regions are used to model noise as a function of code value. The predictions of the model are used to tone noise reduction in all areas of the image according to the appropriate code value.
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