of the input is segmented at regions of deep concavity into simple volumetric components,
such as blocks, cylinders, wedges, and cones. The fundamental assumption of the proposed
theory, recognition-by-components (RBC), is that a modest set of components [N probably≤
36] can be derived from contrasts of five readily detectable properties of edges in a 2-
dimensional image: curvature, collinearity, symmetry, parallelism, and cotermination. The …