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