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