Kevin Bowyer

Computing the visual potential of an articulated assembly of parts

Consideration is given to a generalization of the aspect graph concept which is applicable to objects which may have articulated connection between their (rigid) parts. This generalization is a major step forward in terms of applying the aspect graph concept to a larger and more realistic domain of objects. An algorithm for computing the generalized aspect graph is described, and an example is analyzed in detail.<<ETX>>

ERRORS-2: a 3D object recognition system using aspect graphs

A prototype 3D object recognition system is described that is composed of three major sections; an object representation module, a feature extraction and matching module, and a recognition control strategy module. The object representation module uses an algorithm which constructs perspective projection aspect graphs of convex polyhedra. The feature extraction and matching module uses Fourier descriptors to characterize the complete 2D projection of an object. The recognition control strategy module uses the aspect graph object representation to control the application of a constrained optimization algorithm. The system is implemented in C on a Sun workstation, and some simple recognition experiments are reported that demonstrate the validity of the overall concept. >