{HEAD ~ The movement information} acquiring {TAIL ~ section} acquires movement information showing spatial distribution of the magnitude of a movement in the real space of an image pickup part of a detected body 
acquiring
{ HEAD ~ The movement information } acquiring { TAIL ~ section } acquires movement information showing spatial distribution of the magnitude of a movement in the real space of an image pickup part of a detected body
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH