io/viewers/viewer3D-8bis-2Dimages.cpp

Example of 2D image display in 3D by 3D embedding.

Illustration of multiple 2D image extraction and visualisation from 3D embedding

 
#include "DGtal/base/Common.h"
#include "DGtal/io/readers/VolReader.h"
#include "DGtal/images/ImageHelper.h"
#include "ConfigExamples.h"
#include "DGtal/io/viewers/PolyscopeViewer.h"
 
#include "DGtal/kernel/BasicPointFunctors.h"
 
 
using namespace std;
using namespace DGtal;
 
 
int main()
{
 
  typedef DGtal::ImageContainerBySTLVector<DGtal::Z3i::Domain,  unsigned char > Image3D;
  typedef DGtal::ConstImageAdapter<Image3D, Z2i::Domain, DGtal::functors::Point2DEmbedderIn3D<DGtal::Z3i::Domain>,
                                   Image3D::Value,  DGtal::functors::Identity >  ImageAdapterExtractor;
 
  polyscope::options::programName = "examples/io/viewers: viewer3D-8bis-2Dimages";
  PolyscopeViewer viewer;
 
  
 
  std::string inputFilename = examplesPath + "samples/lobster.vol";
  Image3D imageVol = VolReader<Image3D>::importVol(inputFilename);
  DGtal::functors::Identity idV;
 
 
 
  DGtal::Z3i::Point ptCenter(50, 62, 28);
  const int IMAGE_PATCH_WIDTH = 30;
  // Setting the image domain of the resulting image to be displayed in 3D:
  DGtal::Z2i::Domain domainImage2D (DGtal::Z2i::Point(0,0),
                                    DGtal::Z2i::Point(IMAGE_PATCH_WIDTH, IMAGE_PATCH_WIDTH));
 
 
 
  unsigned int pos=0;
  for (double alpha = 0; alpha< 1.54; alpha+= 0.01){
    // Extracting images from 3D embeder
    DGtal::functors::Point2DEmbedderIn3D<DGtal::Z3i::Domain >  embedder(imageVol.domain(),
                                                                        ptCenter+DGtal::Z3i::Point(static_cast<int>(200.0*cos(alpha)),
                                                                                                   static_cast<int>(100.0*sin(alpha))),
                                                                        DGtal::Z3i::RealPoint(cos(alpha),sin(alpha),cos(2.0*alpha)),
                                                                        IMAGE_PATCH_WIDTH);
    ImageAdapterExtractor extractedImage(imageVol, domainImage2D, embedder, idV);
 
    //Display image and update its position
    viewer << extractedImage;
    pos++;
  }
 
 
 
  viewer.show();
  return EXIT_SUCCESS;
 
}
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