ORB: pre-compute umax.
ORB: pre-compute umax.

kwagyeman/openmv,iabdalkader/openmv,openmv/openmv,openmv/openmv,kwagyeman/openmv,iabdalkader/openmv,kwagyeman/openmv,iabdalkader/openmv,openmv/openmv,openmv/openmv,iabdalkader/openmv,kwagyeman/openmv