fed_tau_by_cycle_time   53 modules/features2d/src/kaze/fed.cpp   return fed_tau_by_cycle_time(T/(float)M,tau_max,reordering,tau);
fed_tau_by_cycle_time   16 modules/features2d/src/kaze/fed.h int fed_tau_by_cycle_time(const float& t, const float& tau_max,