Stick-figure representations of objects were fundamental to the cave drawings of primitive man. They are still typical of the first attempts by children when rendering simple pictorial data using pencil and paper. Today we categorize these stick-figure representations as the skeletons of objects, or, more strictly, endoskeletons, i.e., interior skeletons. There are also exoskeletons, i.e., the exterior skeleton of a collection of objects, noting that the exoskeleton of a single object appears only at infinity. Often the endoskeleton is expressed as the skeleton of the figure (or foreground); the exoskeleton, the skeleton of the ground (background).
KeywordsCellular Automaton Central Element Medial Axis Left Hand Corner Japanese Text
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