Mean Error eNp

Using the definition of the polyline distance between two polygons, we can now compute the mean error of the overall system. It is denoted by eNFp and defined by poly _ 2 x J2t=^J2n=1 Ds(Gnt, Cnt) ,Q

where Ds(Gnt, Cnt) is the polyline distance between the ground truth Gnt and computer-estimated polygons Cnt for patient study n and slice number t. Using the definition of the polyline distance between two polygons, the standard deviation can be computed as a poly -

Ht=1 v g vertices Gvi (db (v, Cnt) - ej\/FP)2 + v g vertices Cm (db (v' Gnt) - ej\FP)2}

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