Perceptual grouping of circular arcs under projection
Paul L. Rosin, G. A. W. West · 1990
Theories and techniques of shape constancy and shape from contour often assert that ellipses seen in an image are the 2D projection of 3D circles from the scene. Given this assumption, several methods for grouping ellipses are described. From these perceptual groups inferences about the 3D structure of their generating circles are made. This will be useful for model invokation. The world (both natural and man-made) is constrained by physical laws to a finite number of basic patterns. Certain three dimensional relationships between features in a scene give rise to two dimensional relationships that are relatively viewpoint invariant and can be distinguished as non-accidental. Thus, those regularities observable in the image arise not by accident, but are projections of real regularities in the scene. The Gestalt movement proposed