| http://www.w3.org/ns/prov#value | - First, for each individual data row identified from vector Ly, i.e. row j, in the current block of t data rows (where t is a constant determined in the manner described above), block 661 calculates the derivative (difference), Dp (x,j), between pixel intensity values, i.e. (Px+l,j -Px,j), as a function of the horizontal position (x) in the row.
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