The apparatus 1, wherein said image division unit divides {HEAD ~ the reference image} into {TAIL ~ a first frequency region} and a second frequency region, the second frequency region being higher in frequency than the first region, to thereby form two frequency division images, 
into
The apparatus 1 , wherein said image division unit divides { HEAD ~ the reference image } into { TAIL ~ a first frequency region } and a second frequency region , the second frequency region being higher in frequency than the first region , to thereby form two frequency division images ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL 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 OTH OTH