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. Author manuscript; available in PMC: 2009 May 1.
Published in final edited form as: IEEE Trans Med Imaging. 2008 May;27(5):577–588. doi: 10.1109/TMI.2007.908687

TABLE III.

Definition of the Three Subsets

Subset 1 {x2 < x3, y2 > y3}
Subset 2 {x2 ≥ x3, y2 > y3, y2 - x2 ≥ y3 - x3}
Subset 3 {x2 ≥ x3, y2 > y3, y2 - x2 < y3 - x3}