features the_features;

        the_extractor->extract_features(padded_image, padded_polygon, the_features);

        BOOST_LOG_TRIVIAL(trace) << "features rows: " << the_features.m_descriptors.rows << " keypoints: " << the_features.m_keypoints.size();

#if 0
        std::vector<bool> passed(the_features.m_keypoints.size(), false);
        int count = 0;
#endif

        boost::geometry::model::linestring<ez::point> linestring;
        std::copy(padded_polygon.outer().begin(), padded_polygon.outer().end(), std::back_inserter(linestring));
        linestring.push_back(padded_polygon.outer()[0]);

        features the_filtered_features;
        the_filtered_features.m_type = the_features.m_type;

        for (size_t index = 0; index < the_features.m_keypoints.size(); ++index)
        {
            ez::point p(the_features.m_keypoints[index].pt.x, the_features.m_keypoints[index].pt.y);
            if (boost::geometry::distance(p, linestring) > ((float)the_features.m_keypoints[index].size / 2.0f))
            {
                the_filtered_features.m_descriptors.push_back(the_features.m_descriptors.row((int)index));
                the_filtered_features.m_keypoints.push_back(the_features.m_keypoints[index]);
            }
        }

        the_filtered_features.m_descriptors.reshape(0, the_features.m_descriptors.cols);