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. 2018 Feb 19;5(1):015006. doi: 10.1117/1.JMI.5.1.015006

Fig. 4.

Fig. 4

A simplified segmentation case with undefined local precision in some of the boundary neighborhoods. (a) Ground truth pixels I to IV; (b) machine segmentation pixel V. The highlighted Moore neighborhood of pixel I contains no machine segmentation pixels, hence the precision metric is undefined there.