pick up means for sensing the object and generating {HEAD ~ an image signal} of {TAIL ~ the object} including a synchronizing signal; and 
pick up means for sensing the object and generating { HEAD ~ an image signal } of { TAIL ~ the object } including a synchronizing signal ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH