testDigitalSurfaceRegularization.cpp

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#include <iostream>
#include "DGtal/base/Common.h"
#include "ConfigTest.h"
#include "DGtalCatch.h"
#include "DGtal/helpers/StdDefs.h"
#include "DGtal/helpers/Shortcuts.h"
#include "DGtal/helpers/ShortcutsGeometry.h"
#include "DGtal/geometry/surfaces/DigitalSurfaceRegularization.h"
 
using namespace std;
using namespace DGtal;
 
// Functions for testing class DigitalSurfaceRegularization.
 
TEST_CASE( "Testing DigitalSurfaceRegularization" )
{
  typedef Shortcuts<Z3i::KSpace> SH3;
  typedef ShortcutsGeometry<Z3i::KSpace> SHG3;
  auto params = SH3::defaultParameters()
  | SHG3::defaultParameters();
  
  params( "polynomial", "goursat" )( "gridstep", 1.0)("verbose", 0);
  auto implicit_shape  = SH3::makeImplicitShape3D  ( params );
  auto digitized_shape = SH3::makeDigitizedImplicitShape3D( implicit_shape, params );
  auto K               = SH3::getKSpace( params );
  
  SECTION("Basic Construction using Trivial Normals and regular/clamped advection")
  {
    auto surface         = SH3::makeDigitalSurface( digitized_shape, K, params );
    auto surfels         = SH3::getSurfelRange( surface, params );
    DigitalSurfaceRegularization<SH3::DigitalSurface> regul(surface);
    regul.init();
    regul.attachConvolvedTrivialNormalVectors(params);
    double energy = regul.computeGradient();
    CAPTURE( regul );
    REQUIRE( energy == Approx(1684.340));
    auto finalenergy = regul.regularize();
    REQUIRE( finalenergy == Approx( 4.7763 ) );
    REQUIRE( regul.isValid() );
    
    auto regularizedPosition = regul.getRegularizedPositions();
    auto original  = regul.getOriginalPositions();
    auto normals   = regul.getNormalVectors();
    
    auto cellIndex = regul.getCellIndex();
    SH3::saveOBJ(surface, [&] (const SH3::Cell &c){ return original[ cellIndex[c]];},
                 normals, SH3::Colors(), "originalSurf.obj");
    SH3::saveOBJ(surface, [&] (const SH3::Cell &c){ return regularizedPosition[ cellIndex[c]];},
                 normals, SH3::Colors(), "regularizedSurf.obj");
    
    //Testing reset() at few points
    regul.reset();
    regularizedPosition = regul.getRegularizedPositions();
    REQUIRE( original[0] == regularizedPosition[0] );
    REQUIRE( original[123] == regularizedPosition[123] );
    
    //Testing Clamped version
    auto finalenergyClamped = regul.regularize(200,1.0,0.001, DigitalSurfaceRegularization<SH3::DigitalSurface>::clampedAdvection);
    regularizedPosition = regul.getRegularizedPositions();
    SH3::saveOBJ(surface, [&] (const SH3::Cell &c){ return regularizedPosition[ cellIndex[c]];},
                 normals, SH3::Colors(), "regularizedSurfClamped.obj");
    REQUIRE( finalenergyClamped == Approx(12.1914) );
    REQUIRE( finalenergy < finalenergyClamped );
    
    //Testing accessor
    auto aPointelIndex = cellIndex.begin();
    REQUIRE( regularizedPosition[ aPointelIndex->second ] == regul.getRegularizedPosition( aPointelIndex->first) );
  }
  
  SECTION("Basic Construction with II Normal Vectors")
  {
    auto surface         = SH3::makeDigitalSurface( digitized_shape, K, params );
    auto surfels         = SH3::getSurfelRange( surface, params );
    auto ii_normals = SHG3::getIINormalVectors(digitized_shape, surfels, params);
    DigitalSurfaceRegularization<SH3::DigitalSurface> regul(surface);
    regul.init();
    auto surfelIndex = regul.getSurfelIndex();
    regul.attachNormalVectors([&](SH3::SCell &c){ return ii_normals[ surfelIndex[c] ];} );
    
    double energy    = regul.computeGradient();
    CAPTURE( regul );
    REQUIRE( energy == Approx(1588.649));
    regul.regularize();
    REQUIRE( regul.isValid() );
    
    auto regularizedPosition = regul.getRegularizedPositions();
    auto normals = regul.getNormalVectors();
    auto cellIndex   = regul.getCellIndex();
    SH3::saveOBJ(surface, [&] (const SH3::Cell &c){ return regularizedPosition[ cellIndex[c]];},
                 normals, SH3::Colors(), "regularizedSurf-II.obj");
  }
  
  SECTION("Warm restart")
  {
    auto surface         = SH3::makeDigitalSurface( digitized_shape, K, params );
    auto surfels         = SH3::getSurfelRange( surface, params );
    DigitalSurfaceRegularization<SH3::DigitalSurface> regul(surface);
    regul.init();
    regul.attachConvolvedTrivialNormalVectors(params);
    CAPTURE( regul );
    auto energy       = regul.regularize(10,1.0,0.1);
    auto secondenergy = regul.regularize(10,1.0,0.1);
    auto thirdenergy  = regul.regularize(10,1.0,0.1);
    CAPTURE(energy);
    CAPTURE(secondenergy);
    CAPTURE(thirdenergy);
    
    REQUIRE( energy > secondenergy );
    REQUIRE( secondenergy > thirdenergy );
  }
  
  SECTION("Local weights")
  {
    auto surface         = SH3::makeDigitalSurface( digitized_shape, K, params );
    auto surfels         = SH3::getSurfelRange( surface, params );
    DigitalSurfaceRegularization<SH3::DigitalSurface> regul(surface);
    regul.init();
    regul.attachConvolvedTrivialNormalVectors(params);
    CAPTURE( regul );
    auto energy       = regul.regularize(10,1.0,0.1);
    
    auto original = regul.getOriginalPositions();
    std::vector<double> alphas(original.size(),0.001);
    std::vector<double> betas(original.size(),1.0);
    std::vector<double> gammas(original.size(), 0.05);
    
    //Init again with variable (but constant) weights
    DigitalSurfaceRegularization<SH3::DigitalSurface> regul2(surface);
    regul2.init(alphas,betas,gammas);
    regul2.attachConvolvedTrivialNormalVectors(params);
    auto energybis  = regul2.regularize(10,1.0,0.1);
    REQUIRE( energy == energybis );
    
    energybis = regul2.regularize();
    auto regularizedPosition = regul.getRegularizedPositions();
    auto normals   = regul.getNormalVectors();
    auto cellIndex = regul.getCellIndex();
    SH3::saveOBJ(surface, [&] (const SH3::Cell &c){ return regularizedPosition[ cellIndex[c]];},
                 normals, SH3::Colors(), "regularizedSurf-local.obj");
    
    //Same with higher data attachment for x < 0.0
    DigitalSurfaceRegularization<SH3::DigitalSurface> regul3(surface);
    for(size_t i = 0 ; i < original.size(); ++i)
      if (original[i][0]<0.0)
      {
        alphas[i] = 4.0;
        betas[i]  = 0.0000001;
        gammas[i] = 0.0;
      }
    regul3.init(alphas,betas,gammas);
    regul3.attachConvolvedTrivialNormalVectors(params);
    energybis = regul3.regularize();
    
    regularizedPosition = regul3.getRegularizedPositions();
    SH3::saveOBJ(surface, [&] (const SH3::Cell &c){ return regularizedPosition[ cellIndex[c]];},
                 normals, SH3::Colors(), "regularizedSurf-localsplit.obj");
  }
}