| http://www.w3.org/ns/prov#value | - ending on the content of each of said M???M blocks of pixels, selectively decomposing each of said M???M blocks of pixels into one or more sub-blocks of pixels, each of said sub-blocks being of a size given by M/2i ???M/2i, where i=0,1,2, . . . ,K-1 and where K is an integer, said decomposing step comprising splitting each of said M???M blocks to produce a hierarchy of sub-blocks including the lev
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