The media position monitoring system 1 wherein said {HEAD ~ portion} of said media initially moved across said light sensitive surface comprises {TAIL ~ a two dimensional area}, whereby said map comprises a two dimensional pattern of media density values and media position monitoring system determines a two dimensional media position 
comprises
The media position monitoring system 1 wherein said { HEAD ~ portion } of said media initially moved across said light sensitive surface comprises { TAIL ~ a two dimensional area } , whereby said map comprises a two dimensional pattern of media density values and media position monitoring system determines a two dimensional media position
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH