DGtal::ReducedMedialAxis< TPowerMap, TImageContainer > Struct Template Reference

Aim: Implementation of the separable medial axis extraction. More...

#include <DGtal/geometry/volumes/distance/ReducedMedialAxis.h>

Public Types
typedef Image< TImageContainer >	Type

Static Public Member Functions
static Type	getReducedMedialAxisFromPowerMap (const TPowerMap &aPowerMap)

Detailed Description

template<typename TPowerMap, typename TImageContainer = ImageContainerBySTLMap<typename TPowerMap::Domain, typename TPowerMap::PowerSeparableMetric::Value>>
struct DGtal::ReducedMedialAxis< TPowerMap, TImageContainer >

Aim: Implementation of the separable medial axis extraction.

Description of template class 'ReducedMedialAxis'

This utility struct extract medial axis balls from a PowerMap. Basically, each (weighted) site of the PowerMap defines a digital maximal ball if its digital power cell restricted to the input shape is not empty [27] .

   Optimal Separable Algorithms to Compute the Reverse
   Euclidean Distance Transformation and Discrete Medial Axis in
   Arbitrary Dimension, D. Coeurjolly and A. Montanvert, IEEE
   Transactions on Pattern Analysis and Machine Intelligence,
   29(3):437-448, 2007.

The output is an image associating ball radii (weight of the power map site) to maximal ball centers. Most methods output a lightweight proxy to an image container (of type ImageContainer, see below).

Note

Following ReverseDistanceTransformation, the input shape is defined as points with negative power distance.

Template Parameters

TPowerMap	any specialized PowerMap type
TImageContainer	any model of CImage to store the medial axis points (default: ImageContainerBySTLVector).

See also

testReducedMedialAxis.cpp

Definition at line 97 of file ReducedMedialAxis.h.

Member Typedef Documentation

Type

template<typename TPowerMap , typename TImageContainer = ImageContainerBySTLMap<typename TPowerMap::Domain, typename TPowerMap::PowerSeparableMetric::Value>>

typedef Image<TImageContainer> DGtal::ReducedMedialAxis< TPowerMap, TImageContainer >::Type

Definition at line 100 of file ReducedMedialAxis.h.

Member Function Documentation

getReducedMedialAxisFromPowerMap()

template<typename TPowerMap , typename TImageContainer = ImageContainerBySTLMap<typename TPowerMap::Domain, typename TPowerMap::PowerSeparableMetric::Value>>

static Type DGtal::ReducedMedialAxis< TPowerMap, TImageContainer >::getReducedMedialAxisFromPowerMap ( const TPowerMap & aPowerMap )

inlinestatic

Extract reduced medial axis from a power map. This methods is in \( O(|powerMap|)\).

Parameters

aPowerMap

the input powerMap

Returns

a lightweight proxy to the ImageContainer specified in template arguments.

Definition at line 112 of file ReducedMedialAxis.h.

    {
      TImageContainer *computedMA = new TImageContainer( aPowerMap.domain() );
 
      for (typename TPowerMap::Domain::ConstIterator it = aPowerMap.domain().begin(),
             itend = aPowerMap.domain().end(); it != itend; ++it)
        {
          const auto v  = aPowerMap( *it );
          const auto pv = aPowerMap.projectPoint( v );
 
          if ( aPowerMap.metricPtr()->powerDistance( *it, v, aPowerMap.weightImagePtr()->operator()( pv ) )
                      < NumberTraits<typename TPowerMap::PowerSeparableMetric::Value>::ZERO )
            computedMA->setValue( v, aPowerMap.weightImagePtr()->operator()( pv ) );
        }
 
      return Type( computedMA );
    }

References DGtal::ImageContainerBySTLVector< TDomain, TValue >::setValue().

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

• ReducedMedialAxis.h