| http://www.w3.org/ns/prov#value | - Apparatus as claimed in claim 2, wherein said threshold values in each of said groups are represented by Cij +k-1, where i and j represent columns and rows, respectively, of said elemental areas of said imaginary matrices, Cij represents the threshold value of a cell located in the elemental area in the i-th column and j-th row of a predetermined one of said imaginary matrices, and k is an integer
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