IMAGING GLOSSARY
Convex (geometry)A 2-dimensional blob, for example, a region of interest (ROI),
where every tangent that can be drawn touches the blob at a continuous
stretch of the blob's surface with no gaps.
In simpler words, if a rubber band could be snugly wrapped around a
convex blob there would be no places where the rubber band lifts off and is
not touching the blob.
Convex is the opposite of concave.
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