Image analysis – Image enhancement or restoration – Image filter
Patent
1996-06-19
1998-07-07
Rogers, Scott
Image analysis
Image enhancement or restoration
Image filter
382162, G06T 500
Patent
active
057781044
ABSTRACT:
The present invention is an adaptive luminance filter for filtering digital images. The present invention preserves annotation that is overlaid on a natural image background. Non-color specific filtering is used to preserve the clarity of the annotation. Images processed with the filter of the present invention are smoothed to varying degrees at each point in the image, depending on the luminance of the picture elements in the surrounding area. As a result, non-annotation areas are smoothed and annotation areas are left unfiltered. This allows higher than normal image quality to be produced and also allows the images to be compressed with greater efficiency.
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Anderson Terry J.
Hoch Jr. Karl J.
Northrop Grumman Corporation
Rogers Scott
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