to extract image data processed by at least one of the plurality of image processing units from {HEAD ~ output} of {TAIL ~ the plurality} of image processing units, and 
of
to extract image data processed by at least one of the plurality of image processing units from { HEAD ~ output } of { TAIL ~ the plurality } of image processing units , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH