Catalogue of Artificial Intelligence Techniques
Author(s): R.M. Cameron-Jones
A method of object representation in which the appearance (under orthographic projection) of the object is modelled over the sphere of possible viewing directions. As the object's appearance in intensity terms depends on the illumination, the form of appearance usually modelled is more stable, e.g., the visibility of a region or the topology of a line drawing of the object. The representation may then consist of the viewsphere regions in which the appearance remains constant and the corresponding appearances in those regions. Considerable interest is also shown in the boundaries between viewsphere regions, which often represent singularities of appearance.
- Gigus, Z., Canny, J. and Seidel, R., Efficiently computing and representing aspect graphs of polyhedral objects
Pattern Analysis and Machine Intelligence 13 (1991), 542--551.