| http://www.w3.org/ns/prov#value | - For a one-dimensional signal s(x), a positive step edge can be characterized by the equation s ( x ; b , c , ed , t ) = b + c 2 ( 1 + erf ( ( x - ed ) / 2 t ) ) , where b corresponds to L1 in FIGS. 1 a and 1 b,c is a contrast corresponding to L2???L1, ed is the center of the edge (the second derivative zero-crossing, a value of 24 in the Figures), and t is a scale parameter controlling the sharpne
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