io/viewers/viewer3D-8-2DSliceImages.cpp

Illustration of the 2D image slice visualization.

 
#include <iostream>
#include "DGtal/io/readers/VolReader.h"
#include "DGtal/base/Common.h"
#include "DGtal/images/ImageHelper.h"
#include "DGtal/images/ImageContainerBySTLVector.h"
#include "DGtal/kernel/BasicPointFunctors.h"
#include "ConfigExamples.h"
 
#include "DGtal/io/viewers/PolyscopeViewer.h"
#include "DGtal/io/Color.h"
 
using namespace std;
using namespace DGtal;
 
int main()
{
  PolyscopeViewer viewer;
 
  typedef DGtal::ImageContainerBySTLVector<DGtal::Z3i::Domain,  unsigned char > Image3D;
  std::string inputFilename = examplesPath + "samples/lobster.vol";
  Image3D imageVol = VolReader<Image3D>::importVol(inputFilename);
 
  // Extracting the 2D images from the 3D one and from a given dimension.
  // First image  the teenth Z slice (dim=2)
  typedef DGtal::ConstImageAdapter<Image3D, DGtal::Z2i::Domain, DGtal::functors::Projector< DGtal::Z3i::Space>,
           Image3D::Value,  DGtal::functors::Identity >  MySliceImageAdapter;
 
  // Define the functor to recover a 2D domain from the 3D one in the Z direction (2):
  DGtal::functors::Projector<DGtal::Z2i::Space>  transTo2DdomainFunctorZ; transTo2DdomainFunctorZ.initRemoveOneDim(2);
  DGtal::Z2i::Domain domain2DZ(transTo2DdomainFunctorZ(imageVol.domain().lowerBound()),
             transTo2DdomainFunctorZ(imageVol.domain().upperBound()));
 
  // Define the functor to associate 2D coordinates to the 3D one by giving the direction Z (2) and the slide numnber (10):
  DGtal::functors::Projector<DGtal::Z3i::Space> aSliceFunctorZ(10); aSliceFunctorZ.initAddOneDim(2);
 
  // We can now obtain the slice image (a ConstImageAdapter):
  const auto identityFunctor = DGtal::functors::Identity();
  MySliceImageAdapter aSliceImageZ(imageVol, domain2DZ, aSliceFunctorZ, identityFunctor );
 
  // Second image  the fiftieth Y slice (dim=1)
  // Define the functor to recover a 2D domain from the 3D one in the Y direction (1):
  DGtal::functors::Projector<DGtal::Z2i::Space>  transTo2DdomainFunctorY; transTo2DdomainFunctorY.initRemoveOneDim(1);
  DGtal::Z2i::Domain domain2DY(transTo2DdomainFunctorY(imageVol.domain().lowerBound()),
             transTo2DdomainFunctorY(imageVol.domain().upperBound()));
 
  // Define the functor to associate 2D coordinates to the 3D one by giving the direction Y (1) and the slide numnber (50):
  DGtal::functors::Projector<DGtal::Z3i::Space> aSliceFunctorY(50); aSliceFunctorY.initAddOneDim(1);
 
  // We can now obtain the slice image (a ConstImageAdapter):
  MySliceImageAdapter aSliceImageY(imageVol, domain2DY, aSliceFunctorY, identityFunctor );
 
  viewer.draw(aSliceImageZ);
  std::string imageY = viewer.draw(aSliceImageY);
  //
 
 
  viewer.show();
  return 0;
}
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