refine1D          239 modules/features2d/src/brisk.cpp   refine1D(const float s_05, const float s0, const float s05, float& max) const; // around octave
refine1D         1325 modules/features2d/src/brisk.cpp       scale = refine1D(max_below_float, std::max(float(center), max_layer), max_above, max);