Image analysis – Image enhancement or restoration – Image filter
Patent
1997-03-27
1998-10-20
Boudreau, Leo H.
Image analysis
Image enhancement or restoration
Image filter
382263, G06K 900
Patent
active
058259376
ABSTRACT:
A spatial-filter which includes a first filtering unit which performs a smoothing process on image data, the smoothing process being a process by which tone oscillations formed by tone levels are suppressed. A second filtering unit performs an adaptive edge-enhancement process on the image data which has previously undergone the smoothing process. The adaptive edge-enhancement process is a process by which sharpness of edges is enhanced, the edges being parts having steep tone gradients in the image. The manner of the adaptive edge-enhancement process depends on edge amounts present in the input image data. The edge amounts are amounts indicating how steep tone gradients of the tone levels represented by the image data are.
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Ohuchi Satoshi
Takahashi Sadao
Boudreau Leo H.
Ricoh & Company, Ltd.
Tadayon Bijan
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