{HEAD ~ The first block generating means} splits {TAIL ~ the output picture} into a plurality of blocks of a specified size which are then outputted sequentially 
{ HEAD ~ The first block generating means } splits { TAIL ~ the output picture } into a plurality of blocks of a specified size which are then outputted sequentially
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH