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