{HEAD ~ an image data obtaining unit} that obtains {TAIL ~ image data} including pixel data corresponding to a plurality of pixels forming the image 
obtains
{ HEAD ~ an image data obtaining unit } that obtains { TAIL ~ image data } including pixel data corresponding to a plurality of pixels forming the image
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH