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