Image analysis – Image enhancement or restoration – Image filter
Reexamination Certificate
2006-09-19
2006-09-19
Couso, Yon J. (Department: 2624)
Image analysis
Image enhancement or restoration
Image filter
C348S607000
Reexamination Certificate
active
07110612
ABSTRACT:
The invention is a method and apparatus for reducing noise in an image. The method and apparatus involves calculating a plurality of directional operators, comparing the directional operators to a predetermined threshold, and applying a filter responsive to the comparing. The method and apparatus computes the directional operators by taking a weighted sum of the absolute differences between a target pixel and its surrounding pixels. The comparison signals to the method or apparatus the existence of a line or edge. If the method or apparatus detects no edge or line, the method applies a smoothing or averaging filter. If the method or apparatus detects an edge or line, the method applies a median filter in the direction with a minimum directional difference.
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Couso Yon J.
Marger & Johnson & McCollom, P.C.
Pixelworks, Inc.
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