private IEnumerable<KeyPoint> FindFeatures_HarrisCornerDetector(string filename)
{
using (var src = new Mat(filename, ImreadModes.GrayScale))
{
// find ínteresting corners
Point2f[] corners = src.GoodFeaturesToTrack(100, 0.01, 100, null, 15, true, 1);
IEnumerable<KeyPoint> keypoints = corners.Select(s => new KeyPoint(s, 100));
return keypoints;
}
}