In the embodiment illustrated in FIG 1, the video data sources 14 are {TAIL ~ video cameras} of the type generally used to acquire {HEAD ~ images} for machine vision systems 
In the embodiment illustrated in FIG 1 , the video data sources 14 are { TAIL ~ video cameras } of the type generally used to acquire { HEAD ~ images } for machine vision systems
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH