FINITE-RESOLUTION ASPECT GRAPHS OF POLYHEDRAL OBJECTS

We address the problem of computing the aspect graph of a polyhedral o bject observed by an orthographic camera with limited spatial resoluti on, such that two image points separated by a distance smaller than a preset threshold cannot be resolved. Under this model, views that woul d differ under normal orthographic projection may become equivalent, w hile ''accidental'' views may occur over finite areas of the view spac e. We present a catalogue of visual events for polyhedral objects and give an algorithm for computing the aspect graph and enumerating all q ualitatively different aspects. The algorithm has been fully implement ed and results are presented.