According to the invention, {HEAD ~ the 3 D machine vision obstacle detection apparatus} includes an image acquisition device such as two or more video cameras, or digital cameras, arranged to view {TAIL ~ a monitored scene} stereoscopically 
arranged to view
According to the invention , { HEAD ~ the 3 D machine vision obstacle detection apparatus } includes an image acquisition device such as two or more video cameras , or digital cameras , arranged to view { TAIL ~ a monitored scene } stereoscopically
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH