said decomposition image generation unit provides the reference points at respective apexes of a frequency division image of the first frequency region and applies weighting to the frequency division image with each reference point as a reference to thereby generate {HEAD ~ decomposition images} corresponding in {TAIL ~ number} to the reference points, and 
corresponding in
said decomposition image generation unit provides the reference points at respective apexes of a frequency division image of the first frequency region and applies weighting to the frequency division image with each reference point as a reference to thereby generate { HEAD ~ decomposition images } corresponding in { TAIL ~ number } to the reference points , and
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