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convex hull

The smallest convex polygon that contains a shape's entire boundary.

A shape's convex hull is the smallest convex polygon containing every point of its boundary -- equivalently, the shape traced by stretching a rubber band around it. It is always at least as large as the shape's own contour, and the two coincide exactly when the shape is already convex.

Examples

  • A hand's contour has deep concave notches between the fingers, but its convex hull is one smooth shape stretched tight around the fingertips.

See also

contour bounding box
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