example-time-surface.cpp

This is an example of how to use the TimeSurface_<T> class.

#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <openev/openev.hpp>
 
inline void show(ev::TimeSurface3b &ts) {
  ev::TimeSurface3b resized;
  cv::resize(ts.render(), resized, ev::Size(500, 500), 0, 0, cv::INTER_NEAREST);
  cv::imshow("example-event-image", resized);
  cv::waitKey(5);
}
 
int main(int argc, const char *argv[]) {
  ev::TimeSurface3b timesurface(30, 30);
  timesurface.setColors(cv::viz::Color::bluberry(), cv::viz::Color::cherry(), cv::viz::Color::black());
 
  int row = 0;
  int col = 0;
  int direction = 0;
  int offset = 0;
  double t = 0;
 
  while(offset < 0.55 * timesurface.cols) {
    t += rand() % 10;
    timesurface.insert(ev::Event(col, row, t, (rand() % 2) ? ev::POSITIVE : ev::NEGATIVE));
    switch(direction) {
    case 0:
      col++;
      if(col >= timesurface.cols - 1 - offset) direction++;
      break;
    case 1:
      row++;
      if(row >= timesurface.rows - 1 - offset) direction++;
      break;
    case 2:
      col--;
      if(col <= offset) {
        direction++;
        offset++;
      }
      break;
    case 3:
      row--;
      if(row <= offset) direction = 0;
    }
    show(timesurface);
  }
  return 0;
}