Abstract
Informally, the aspect graph [KvD79] (also called view graph) is a qualitative, viewer-centered representation which enumerates all possible appearances of an object. More formally, choosing a camera model (orthographic-parallel or perspective-central-projection) and a viewpoint determines the aspect of an object (i.e., the structure of the observed line-drawing). The range of possible viewpoints can be partitioned into maximal connected sets (regions) that yield identical aspects. The change in aspect at the boundary between regions is called a visual event. The maximal regions and the associated aspects form the nodes of an aspect graph, whose arcs correspond to the visual event boundaries between adjacent regions.
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Petitjean, S. (1996). The complexity and enumerative geometry of aspect graphs of smooth surfaces. In: González-Vega, L., Recio, T. (eds) Algorithms in Algebraic Geometry and Applications. Progress in Mathematics, vol 143. Birkhäuser Basel. https://doi.org/10.1007/978-3-0348-9104-2_16
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