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Fig. 6 | BMC Medical Imaging

Fig. 6

From: Metrics for evaluating 3D medical image segmentation: analysis, selection, and tool

Fig. 6

Metrics that fail to discover boundary errors. In a, the star is compared with a circle and in b the same star is compared with another star of the same dimensions, rotated so that the resulting overlap errors (FP and FN) are equal in magnitude in both cases. All metrics that are based on FP and FN (overlap-based metrics) are not able to discover that the two shapes in (b) are more similar to each other than those in (a). On the contrary, all spatial distance based metrics discover the similarity and give (b) a higher score than (a). However, the metric most invariant to boundary error is the volumetric similarity, since it gives a perfect match in both cases

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