Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Patent
1997-02-07
1999-10-05
Moore, David K.
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
382263, G06K 940
Patent
active
059636769
ABSTRACT:
A multi-scale approach to enhancement is taken where enhancement masks are generated at different scales and then combined together using a pyramid scheme. Each mask is computed from applying directional sensitive Laplacian kernels, which is responsible for extracting images of low contrast, followed by an adaptive non-linear mapping. This non-linearity is crucial in virtually eliminating edge overshoots. Furthermore, the input image may also be preprocessed by an edge-preserving smoothing filter to reduce the noise effect.
REFERENCES:
patent: 5133020 (1992-07-01), Giger et al.
patent: 5343390 (1994-08-01), Doi et al.
patent: 5467404 (1995-11-01), Vuylsteke et al.
Fang Ming
Wu Zhenyu
Brinich Stephen
Moore David K.
Paschburg Donald B.
Siemens Corporate Research Inc.
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