img2freeman.cpp

 
#include "DGtal/io/colormaps/GrayscaleColorMap.h"
#include "DGtal/io/readers/GenericReader.h"
#include "DGtal/images/ImageContainerBySTLVector.h"
#include "DGtal/images/ImageSelector.h"
#include "DGtal/geometry/curves/FreemanChain.h"
#include "DGtal/geometry/helpers/ContourHelper.h"
#include "DGtal/topology/helpers/Surfaces.h"
 
#include "CLI11.hpp"
 
#include <vector>
#include <string>
#include <climits>
 
 
using namespace DGtal;
typedef ImageSelector < Z2i::Domain, unsigned char>::Type Image;
 
 
std::vector<unsigned int> getHistoFromImage(const Image &image){
  const Image::Domain &imgDom = image.domain();
  std::vector<unsigned int> vectHisto(UCHAR_MAX);
  for(Image::Domain::ConstIterator it=imgDom.begin(); it!= imgDom.end(); ++it){
    vectHisto[image(*it)]++;
  }
  return vectHisto;
}
 
unsigned int 
getOtsuThreshold(const Image &image){
  std::vector<unsigned int> histo = getHistoFromImage(image);
  unsigned int imageSize = image.domain().size();
  unsigned int sumA = 0;
  unsigned int sumB = imageSize;
  unsigned int muA=0;
  unsigned int muB=0;
  unsigned int sumMuAll= 0;
  for( unsigned int t=0; t< histo.size();t++){
    sumMuAll+=histo[t]*t;
  }
  
  unsigned int thresholdRes=0;
  double valMax=0.0;
  for( unsigned int t=0; t< histo.size(); t++){
    sumA+=histo[t];
    if(sumA==0)
      continue; 
    sumB=imageSize-sumA;
    if(sumB==0){
      break;
    }
    
    muA+=histo[t]*t;
    muB=sumMuAll-muA;
    double muAr=muA/(double)sumA;
    double muBr=muB/(double)sumB;
    double sigma=  (double)sumA*(double)sumB*(muAr-muBr)*(muAr-muBr);
    if(valMax<=sigma){
      valMax=sigma;
      thresholdRes=t;
    }
  }
  return thresholdRes;
}
 
struct CompContours{
  bool operator()(std::vector<Z2i::Point> a, std::vector<Z2i::Point> b ){
    return a.size() > b.size();
  }
};
 
 
void saveAllContoursAsFc( std::vector< std::vector< Z2i::Point >  >  vectContoursBdryPointels, 
                         unsigned int minSize, bool sort=false){
  CompContours comp;
  if(sort){
    std::sort(vectContoursBdryPointels.begin(), vectContoursBdryPointels.end(), comp);
  }
  for(unsigned int k=0; k<vectContoursBdryPointels.size(); k++){
    if(vectContoursBdryPointels.at(k).size()>minSize){
      FreemanChain<Z2i::Integer> fc (vectContoursBdryPointels.at(k));    
          std::cout << fc.x0 << " " << fc.y0   << " " << fc.chain << std::endl; 
          
    }
  }
}
 
 
void saveSelContoursAsFC(std::vector< std::vector< Z2i::Point >  >  vectContoursBdryPointels, 
                         unsigned int minSize, Z2i::Point refPoint, double selectDistanceMax, 
                         bool sort=false){
  CompContours comp;
  if(sort){
    std::sort(vectContoursBdryPointels.begin(), vectContoursBdryPointels.end(), comp);
  }
 
  for(unsigned int k=0; k<vectContoursBdryPointels.size(); k++){
    if(vectContoursBdryPointels.at(k).size()>minSize){
      Z2i::RealPoint ptMean = ContourHelper::getBarycenter(vectContoursBdryPointels.at(k));
      unsigned int distance = (unsigned int)ceil(sqrt((ptMean[0]-refPoint[0])*(ptMean[0]-refPoint[0])+
                                                      (ptMean[1]-refPoint[1])*(ptMean[1]-refPoint[1])));
      if(distance<=selectDistanceMax){
        FreemanChain<Z2i::Integer> fc (vectContoursBdryPointels.at(k));    
        std::cout << fc.x0 << " " << fc.y0   << " " << fc.chain << std::endl; 
      }      
    }    
  }
}
 
 
 
 
int main( int argc, char** argv )
{
  // parse command line using CLI ----------------------------------------------
  CLI::App app;
  std::string inputFileName;
  std::string outputFileName {"result.fc"};
  
  double minThreshold {128};
  double maxThreshold {255};
  unsigned int minSize {0};
  bool select {false};
  bool sortCnt {false};
 
  Z2i::Point selectCenter;
  unsigned int selectDistanceMax = 0; 
  std::vector<int> cntConstraints;
  std::vector<int> vectRangeMin, vectRangeMax, vectRange;
    
  app.description("Extract FreemanChains from thresholded image.\n Basic example: \t img2freeman [options] --input <imageName> -min 128 -max 255 > contours.fc \n  Note that if you don't specify any threshold a threshold threshold max is automatically defined from the Otsu algorithm with min=0. ");
  app.add_option("-i,--input,1", inputFileName, "input image file name (any 2D image format accepted by DGtal::GenericReader)." )
    ->required()
    ->check(CLI::ExistingFile);
  app.add_option("-m,--min", minThreshold, "min image threshold value (default 128)");
  app.add_option("-M,--max", maxThreshold, "max image threshold value (default 255)");
  app.add_flag("--sort", sortCnt,"to sort the resulting freemanchain by decreasing size." );
  app.add_option("-s,--minSize", minSize,"minSize of the extracted freeman chain (default 0)" );
  app.add_option("contourSelect",cntConstraints,"Select contour according reference point and maximal distance:  ex. --contourSelect X Y distanceMax" )
    -> expected(3);
  app.add_option("-r,--thresholdRangeMin",vectRangeMin, "use a range interval as threshold (from min) : --thresholdRangeMin min increment max : for each possible i, it define a digital sets [min, min+((i+1)*increment)] such that min+((i+1)*increment)< max  and extract their boundary." )
  -> expected(3);
  app.add_option("-R,--thresholdRangeMax",vectRangeMax, "use a range interval as threshold (from max) : --thresholdRangeMax min increment max : for each possible i, it define a digital sets [ max-((i)*increment), max] such that max-((i)*increment)>min  and extract their boundary." )
  -> expected(3);
 
 
  app.get_formatter()->column_width(40);
  CLI11_PARSE(app, argc, argv);
  // END parse command line using CLI ----------------------------------------------
 
 
  bool thresholdRange=vectRangeMax.size()==3 || vectRangeMin.size()==3;
  typedef functors::IntervalThresholder<Image::Value> Binarizer; 
  Image image = GenericReader<Image>::import( inputFileName ); 
  
  
  if(cntConstraints.size()==3){
    select=true;
    selectCenter[0]= cntConstraints.at(0);
    selectCenter[1]= cntConstraints.at(1);
    selectDistanceMax= (unsigned int) cntConstraints.at(2);
  }
  
  int min, max, increment;
  if(! thresholdRange){
    min=(int)minThreshold;
    max= (int)maxThreshold;
    increment =  (int)(maxThreshold - minThreshold);
    if(minThreshold == 128 && maxThreshold == 255) {
      min=0;
      trace.info() << "Min/Max threshold values not specified, set min to 0 and computing max with the otsu algorithm...";     
      max = getOtsuThreshold(image);
      trace.info() << "[done] (max= " << max << ") "<< std::endl;
    }
    
  }else{
    vectRange = (vectRangeMin.size()==3) ? vectRangeMin : vectRangeMax;
    min=vectRange.at(0);
    increment=vectRange.at(1);
    max = vectRange.at(2);
    minThreshold=min;
    maxThreshold=max;
  }
 
  
  Z2i::KSpace ks;
  if(! ks.init( image.domain().lowerBound(), 
                image.domain().upperBound(), true )){
    trace.error() << "Problem in KSpace initialisation"<< std::endl;
  }
  
  
  if (!thresholdRange){
    Binarizer b(min, max); 
    functors::PointFunctorPredicate<Image,Binarizer> predicate(image, b); 
    trace.info() << "DGtal contour extraction from thresholds ["<<  min << "," << max << "]" ;
    SurfelAdjacency<2> sAdj( true );
    std::vector< std::vector< Z2i::Point >  >  vectContoursBdryPointels;
    Surfaces<Z2i::KSpace>::extractAllPointContours4C( vectContoursBdryPointels,
                                                      ks, predicate, sAdj );  
    if(select){
      saveSelContoursAsFC(vectContoursBdryPointels,  minSize, selectCenter,  selectDistanceMax, sortCnt);
    }else{
      saveAllContoursAsFc(vectContoursBdryPointels,  minSize, sortCnt); 
    }
  }else{
    for(int i=0; minThreshold+i*increment< maxThreshold; i++){
      if(vectRangeMin.size()==3){
        min = (int)(minThreshold+(i)*increment);
      }
      if(vectRangeMax.size()==3){
        max = (int)(maxThreshold-(i)*increment);
      }
      Binarizer b(min, max); 
      functors::PointFunctorPredicate<Image,Binarizer> predicate(image, b); 
      
      trace.info() << "DGtal contour extraction from thresholds ["<<  min << "," << max << "]" ;
      SurfelAdjacency<2> sAdj( true );
      std::vector< std::vector< Z2i::Point >  >  vectContoursBdryPointels;
      Surfaces<Z2i::KSpace>::extractAllPointContours4C( vectContoursBdryPointels,
                                                        ks, predicate, sAdj );  
      if(select){
          saveSelContoursAsFC(vectContoursBdryPointels,  minSize,
                              selectCenter,  selectDistanceMax, sortCnt);
      }else{
          saveAllContoursAsFc(vectContoursBdryPointels,
                              minSize, sortCnt);
      }
      trace.info() << " [done]" << std::endl;
    }
  }
}