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