| http://www.w3.org/ns/prov#value | - Irregular shape unit images except for the predetermined shape, such as the square and rectangle, require a complicated process when the unit image is stored in the unit-image storage means 15 comprising a memory such as a RAM. Therefore, the unit-image normalizing means 12 shapes a unit image which is not a square or a rectangle into a regular shape such as a square or a rectangle when the unit i
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