_float_ops::non_maximum_suppression(c, n_, thresh_, x_pos, y_pos, val);   return true; }  //------------------------------------------------------------------------ // : extract corners using vil code // bool sdet_harris_detector::extract_corners_vil(std::vector<float>& x_pos,                                                std::vector<float>& y_pos,                                                std::vector<float>& val) { // Check the image   if (!