exampleIntegralInvariantCurvature3D.cpp

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#include <iostream>
#include "DGtal/base/Common.h"
 
// Shape construction
#include "DGtal/io/readers/VolReader.h"
#include "DGtal/images/ImageSelector.h"
#include "DGtal/images/imagesSetsUtils/SetFromImage.h"
#include "DGtal/images/SimpleThresholdForegroundPredicate.h"
#include "DGtal/topology/helpers/Surfaces.h"
#include "DGtal/topology/LightImplicitDigitalSurface.h"
#include "DGtal/images/ImageHelper.h"
#include "DGtal/topology/DigitalSurface.h"
#include "DGtal/graph/DepthFirstVisitor.h"
#include "DGtal/graph/GraphVisitorRange.h"

#include "DGtal/geometry/surfaces/estimation/IIGeometricFunctors.h"
#include "DGtal/geometry/surfaces/estimation/IntegralInvariantVolumeEstimator.h"
 
// Drawing
#include "DGtal/io/viewers/PolyscopeViewer.h"
#include "DGtal/io/colormaps/GradientColorMap.h"

 
using namespace DGtal;

 
int main( int argc, char** argv )
{
    if ( argc != 4 )
    {
        trace.error() << "Usage: " << argv[0]
                               << " <fileName.vol> <threshold> <radius>" << std::endl;
        trace.error() << "Example : "<< argv[0] << " Al.150.vol 0 7" << std::endl;
        return 0;
    }
 
    trace.beginBlock ( "Example IntegralInvariantCurvature3D" );
    trace.info() << "Args:";
    for ( int i = 0; i < argc; ++i )
        trace.info() << " " << argv[ i ];
    trace.info() << std::endl;
 
    double h = 1.0;
    unsigned int threshold = std::atoi( argv[ 2 ] );

    typedef ImageSelector< Z3i::Domain, bool >::Type Image;
    typedef functors::SimpleThresholdForegroundPredicate< Image > ImagePredicate;
    typedef LightImplicitDigitalSurface< Z3i::KSpace, ImagePredicate > MyLightImplicitDigitalSurface;
    typedef DigitalSurface< MyLightImplicitDigitalSurface > MyDigitalSurface;
 
    std::string filename = argv[1];
    Image image = VolReader<Image>::importVol( filename );
    ImagePredicate predicate = ImagePredicate( image, threshold );
 
    Z3i::Domain domain = image.domain();
 
    Z3i::KSpace KSpaceShape;
 
    bool space_ok = KSpaceShape.init( domain.lowerBound(), domain.upperBound(), true );
    if (!space_ok)
    {
      trace.error() << "Error in the Khalimsky space construction."<<std::endl;
      return 2;
    }
 
    SurfelAdjacency< Z3i::KSpace::dimension > SAdj( true );
    Z3i::KSpace::Surfel bel = Surfaces< Z3i::KSpace >::findABel( KSpaceShape, predicate, 100000 );
    MyLightImplicitDigitalSurface LightImplDigSurf( KSpaceShape, predicate, SAdj, bel );
    MyDigitalSurface digSurf( LightImplDigSurf );
 
    typedef DepthFirstVisitor< MyDigitalSurface > Visitor;
    typedef GraphVisitorRange< Visitor > VisitorRange;
    typedef VisitorRange::ConstIterator SurfelConstIterator;
 
    VisitorRange range( new Visitor( digSurf, *digSurf.begin() ) );
    SurfelConstIterator abegin = range.begin();
    SurfelConstIterator aend = range.end();

    double radius = std::atof(argv[3]);
 
    typedef functors::IIMeanCurvature3DFunctor<Z3i::Space> MyIICurvatureFunctor;
    typedef IntegralInvariantVolumeEstimator< Z3i::KSpace, ImagePredicate, MyIICurvatureFunctor > MyIICurvatureEstimator;
 
    // For computing Gaussian curvature instead, for example, change the two typedef above by :
    // typedef functors::IIGaussianCurvature3DFunctor<Z3i::Space> MyIICurvatureFunctor;
    // typedef IntegralInvariantCovarianceEstimator< Z3i::KSpace, ImagePredicate, MyIICurvatureFunctor > MyIICurvatureEstimator;
    // and it's done. The following part is exactly the same.
 
    typedef MyIICurvatureFunctor::Value Value;
 
    MyIICurvatureFunctor curvatureFunctor; // Functor used to convert volume -> curvature
    curvatureFunctor.init( h, radius ); // Initialisation for a grid step and a given Euclidean radius of convolution kernel
 
    MyIICurvatureEstimator curvatureEstimator( curvatureFunctor );
    curvatureEstimator.attach( KSpaceShape, predicate ); // Setting a KSpace and a predicate on the object to evaluate
    curvatureEstimator.setParams( radius / h ); // Setting the digital radius of the convolution kernel
    curvatureEstimator.init( h, abegin, aend ); // Initialisation for a given h, and a range of surfels
 
    std::vector< Value > results;
    std::back_insert_iterator< std::vector< Value > > resultsIt( results ); // output iterator for results of Integral Invariant curvature computation
    curvatureEstimator.eval( abegin, aend, resultsIt ); // Computation

    Value min = std::numeric_limits < Value >::max();
    Value max = std::numeric_limits < Value >::min();
    for ( unsigned int i = 0; i < results.size(); ++i )
    {
        if ( results[ i ] < min )
        {
            min = results[ i ];
        }
        else if ( results[ i ] > max )
        {
            max = results[ i ];
        }
    }
 
    typedef PolyscopeViewer<Z3i::Space, Z3i::KSpace> Viewer;
    Viewer viewer( KSpaceShape );
    viewer.allowReuseList = true;
 
    typedef GradientColorMap< Value > Gradient;
    Gradient cmap_grad( min, max );
    cmap_grad.addColor( Color( 50, 50, 255 ) );
    cmap_grad.addColor( Color( 255, 0, 0 ) );
    cmap_grad.addColor( Color( 255, 255, 10 ) );
 
    VisitorRange range2( new Visitor( digSurf, *digSurf.begin() ) );
    abegin = range2.begin();
 
    Z3i::KSpace::Cell dummy_cell;
 
    viewer.allowReuseList = true;
    for ( unsigned int i = 0; i < results.size(); ++i )
    {   
        viewer << WithQuantity(KSpaceShape.unsigns(*abegin), "Curvature", results[i]);
        ++abegin;
    }
 
    trace.endBlock();
    viewer.show();
    return 0;
}
int main( int argc, char** argv ) {…}
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