Dec. 2000

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1. Description of the boundary or outline of an object.

• a sequence of elements: points, triangles, ...
• distinctive features: the corners of a cube, its edges, ...
• the relationship between elements, features
• models: polygons, Fourier descriptors, splines, curvature, ...

2. Description of the interior or region delimited by an object.

• space-filling, compactness
• symmetry and topology
• models: superquadrics, implicit functions, skeletal graphs, ...

non-maximal gauges	maximal gauges

..... Boundary versus Region.

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