What is the frequency factor? What exactly does it control?

[aryaman-patel]

The parameters are multiplied by a frequency factor here :

template <class TDescriptor, class F>
void LoopCloser<TDescriptor,F>::Parameters::set(float f)
{
    dislocal =10 * f;
    max_db_results = 100 * f;
    min_nss_factor = 0.005;
    min_matches_per_group = f;
    max_intragroup_gap = 5 * f;
    max_distance_between_groups = 3 * f;
    max_distance_between_queries = 2 * f;

    min_Fpoints = 8;  // 12 for fundamental.
    max_ransac_iterations = 1000;
    ransac_probability = 0.70;
    max_reprojection_error = 3.0;

    max_neighbor_ratio = 0.6;
}