Image analysis – Image enhancement or restoration – Image filter
Patent
1995-06-07
1998-10-06
Couso, Jose L.
Image analysis
Image enhancement or restoration
Image filter
382254, 382269, 348627, G06K 940
Patent
active
058189726
ABSTRACT:
A system for, and method of, enhancing a digitized image signal according to a helper signal architecture are described. The architecture includes an analysis filter, responsive to a digitized image signal, for filtering the digitized image signal, corresponding to a first frequency band, to produce a first frequency band signal. The first frequency band signal is then applied to a point operator, which modifies the first frequency band signal in accordance with a non-linear characteristic. The non-linear characteristic includes a first region having a negative slope for low amplitude input signals. The non-linearity further includes a second region having a positive slope for informational components of an input signal so that informational components of the first frequency band signal cause the point operator to produce a modified signal having components that relate to the input signal according to the positive slope. The modified signal is then received by an synthesis filter, corresponding to the analysis filter, to produce a helper signal. The helper signal and the digitized image signal are then added to yield an enhanced digitized image signal.
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A Method for the Digital Enhancement of Unsharp, Grainy Images, Powell et al., (Jul. 1982), pp. 179-183.
Adelson Edward H.
Girod Bernd
Bella Matthew C.
Couso Jose L.
RealNetworks, Inc.
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