IMAGING GLOSSARY
Concave (geometry)A 2-dimensional blob, for example, a region of interest (ROI),
where at least one tangent is drawn that touches the blob at two different
locations, and there is a point on the tangent between the two contacts that
does not touch the blob.
In simpler words, if a rubber band could be snugly wrapped around a
concave blob there would be places where the rubber band lifts off and does
not touch the blob.
Concave is the opposite of convex.
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