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  #include "precomp.hpp"
  #include "gtrUtils.hpp"
  
  
  namespace cv
  {
  namespace gtr
  {
  
  double generateRandomLaplacian(double b, double m)
  {
      double t = (double)rand() / (RAND_MAX);
      double n = (double)rand() / (RAND_MAX);
  
      if (t > 0.5)
          return m + b*log(n);
      else
          return m - b*log(n);
  }
  
  Rect2f anno2rect(std::vector<Point2f> annoBB)
  {
      Rect2f rectBB;
      rectBB.x = min(annoBB[0].x, annoBB[1].x);
      rectBB.y = min(annoBB[0].y, annoBB[2].y);
      rectBB.width = fabs(annoBB[0].x - annoBB[1].x);
      rectBB.height = fabs(annoBB[0].y - annoBB[2].y);
  
      return rectBB;
  }
  
  std::vector <TrainingSample> gatherFrameSamples(Mat prevFrame, Mat currFrame, Rect2f prevBB, Rect2f currBB)
  {
      std::vector <TrainingSample> trainingSamples;
      Point2f currCenter, prevCenter;
      Rect2f targetPatchRect, searchPatchRect;
      Mat targetPatch, searchPatch;
      Mat prevFramePadded, currFramePadded;
  
      //Crop Target Patch
  
      //Padding
  
      //Previous frame GTBBs center
      prevCenter.x = prevBB.x + prevBB.width / 2;
      prevCenter.y = prevBB.y + prevBB.height / 2;
  
      targetPatchRect.width = (float)(prevBB.width*padTarget);
      targetPatchRect.height = (float)(prevBB.height*padTarget);
      targetPatchRect.x = (float)(prevCenter.x - prevBB.width*padTarget / 2.0 + targetPatchRect.width);
      targetPatchRect.y = (float)(prevCenter.y - prevBB.height*padTarget / 2.0 + targetPatchRect.height);
  
      copyMakeBorder(prevFrame, prevFramePadded, (int)targetPatchRect.height, (int)targetPatchRect.height, (int)targetPatchRect.width, (int)targetPatchRect.width, BORDER_REPLICATE);
  
      targetPatch = prevFramePadded(targetPatchRect);
  
  
      for (int i = 0; i < samplesInFrame; i++)
      {
          TrainingSample sample;
  
          //Current frame GTBBs center
          currCenter.x = (float)(currBB.x + currBB.width / 2.0);
          currCenter.y = (float)(currBB.y + currBB.height / 2.0);
  
          //Generate and add random Laplacian distribution (Scaling from target size)
          double dx, dy, ds;
          dx = generateRandomLaplacian(bX, 0)*prevBB.width;
          dy = generateRandomLaplacian(bY, 0)*prevBB.height;
          ds = generateRandomLaplacian(bS, 1);
  
          //Limit coefficients
          dx = min(dx, (double)prevBB.width);
          dx = max(dx, (double)-prevBB.width);
          dy = min(dy, (double)prevBB.height);
          dy = max(dy, (double)-prevBB.height);
          ds = min(ds, Ymax);
          ds = max(ds, Ymin);
  
          searchPatchRect.width = (float)(prevBB.width*padSearch*ds);
          searchPatchRect.height =(float)(prevBB.height*padSearch*ds);
          searchPatchRect.x = (float)(currCenter.x + dx - searchPatchRect.width / 2.0 + searchPatchRect.width);
          searchPatchRect.y = (float)(currCenter.y + dy - searchPatchRect.height / 2.0 + searchPatchRect.height);
          copyMakeBorder(currFrame, currFramePadded, (int)searchPatchRect.height, (int)searchPatchRect.height, (int)searchPatchRect.width, (int)searchPatchRect.width, BORDER_REPLICATE);
          searchPatch = currFramePadded(searchPatchRect);
  
          //Calculate Relative GTBB in search patch
          Rect2f relGTBB;
          relGTBB.width = currBB.width;
          relGTBB.height = currBB.height;
          relGTBB.x = currBB.x - searchPatchRect.x + searchPatchRect.width;
          relGTBB.y = currBB.y - searchPatchRect.y + searchPatchRect.height;
  
          //Link to the sample struct
          sample.targetPatch = targetPatch.clone();
          sample.searchPatch = searchPatch.clone();
          sample.targetBB = relGTBB;
  
          trainingSamples.push_back(sample);
      }
  
      return trainingSamples;
  }
  
  }
  }
  