edge_density.h

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#ifndef edge_density_h_DEFINED
#define edge_density_h_DEFINED

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
#include "abstract_feature.h"
#include <vector>
#include <iostream>

namespace cpl_visual_features
{
class EdgeDensity : public AbstractFeature<float>
{
 public:
  CannyEdges() : thresh1_(2100.0), thresh2_(2300.0)
  {
  }

  virtual void operator()(cv::Mat& patch, cv::Rect& window)
  {
    // TODO: Should actually shrink, based on the window, don't use the whole
    // thing...
    cv::Mat edges(patch.size(), CV_8UC1);
    cv::Mat patch_bw(patch.size(), CV_8UC1);

    cv::cvtColor(patch, patch_bw, CV_BGR2GRAY);
    cv::Canny(patch_bw, edges, thresh1_, thresh2_, 5);

    float sum = 0;
    for (int r = 0; r < patch.rows; ++r)
    {
      for (int c = 0; c < patch.cols; ++c)
      {
        if (edge.at<uchar>(r,c) > 0)
          sum += 1;
      }
    }
    float perimeter = window.width*2 + window.height*2;
    descriptor_ = sum / perimeter;
  }

  virtual float getDescriptor() const
  {
    return descriptor_;
  }

 protected:
  float descriptor_;
  double thresh1_;
  double thresh2_;
};
}
#endif // edge_density_h_DEFINED