GammaMAPFunctor< VALUETYPE > Class Template Reference

This function tries to reduce the speckle noise of an image by applying the Gamma Maximum A Posteriori (MAP) filter. More...

#include <vigra/specklefilters.hxx>

Detailed Description

template<typename VALUETYPE>
class vigra::GammaMAPFunctor< VALUETYPE >

This function tries to reduce the speckle noise of an image by applying the Gamma Maximum A Posteriori (MAP) filter.

This function tries to reduce the speckle noise of an image by means of applying the Gamma Maximum A Posteriori (MAP) filter using a window of given size, and the equivalent numbers of look (enl). The implementation is according to the article by Lopez & Touzi & Nezry (1990): Adaptive speckle filters and scene heterogenity.The user has to provide a window size and the equivalent numbers of look (enl). The implementation is according to the article by Lopez & Touzi & Nezry (1990): Adaptive speckle filters and scene heterogenity.

All restrictions of the called functions applyWindowFunction apply.

Preconditions:

enl > 0

Declarations:

pass 2D array views:

namespace vigra {
    template <class T1, class S1,
              class T2, class S2>
    void
    gammaMAPFilter(MultiArrayView<2, T1, S1> const & src,
                         MultiArrayView<2, T2, S2> dest,
                         Diff2D window_shape, int enl,
                         BorderTreatmentMode border = BORDER_TREATMENT_REPEAT);

}

show deprecated declarations

pass Image Iterators and Data Accessors :

namespace vigra {
    template <class SrcIterator, class SrcAccessor,
              class DestIterator, class DestAccessor>
    void gammaMAPFilter(SrcIterator supperleft,
                              SrcIterator slowerright, SrcAccessor sa,
                              DestIterator dupperleft, DestAccessor da,
                              Diff2D window_shape, int enl,
                              BorderTreatmentMode border = BORDER_TREATMENT_REPEAT);
}

use argument objects in conjunction with Argument Object Factories :

namespace vigra {
    template <class SrcIterator, class SrcAccessor,
              class DestIterator, class DestAccessor>
    void
    gammaMAPFilter(triple<SrcIterator, SrcIterator, SrcAccessor> src,
                         pair<DestIterator, DestAccessor> dest,
                         Diff2D window_shape, int enl,
                         BorderTreatmentMode border = BORDER_TREATMENT_REPEAT);
}

Usage:

#include <vigra/specklefilters.hxx>
Namespace: vigra

unsigned int w=1000, h=1000;
MultiArray<2, float> src(w,h), dest(w,h);
...

// apply a Gamma MAP filter with a window size of 5x5, where
// the image was composed by 3 equivalent looks:
gammaMAPFilter(src, dest, Diff2D(5,5), 3);

---

The documentation for this class was generated from the following file:

• vigra/specklefilters.hxx