Line drawings of octree-represented objects

Interpretation of line drawings of complex objects

The machine interpretation of line drawings (pioneered by Guzman’) has a privileged position in the computer vision literature. It has proved to be the inspiration and testing ground of important techniques of much wider application, such as discrete relaxation’. Ironically, the simplified and idealized nature of the line drawing interpretation problems studied, which make them so attractive as...

Correspondence in Line Drawings of Multiple Views of Objects

This research was sponsored by the Defense Advanced Research Projects Agency (DOD), ARPA Order No. 3597, monitored by the Air Force Avionics Laboratory Under Contract F33615-81 -K-1539. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Defense Advanced Research Pr...

Computing the aspect graph for line drawings of polyhedral objects

Octree representations of moving objects

An algorithm is described that updates an object's octree representation as the object is linearly translated through space. This is accomplished by performing simple arithmetic on the path representations of the nodes to be translated. Among others, one advantage of the algorithm is in devising collision-free and efficient trajectories of moving objects in robotics.

Measurement and modelling of perceived slant in surfaces represented by freely viewed line drawings.

Simple pictures under everyday viewing conditions evoke impressions of surfaces oriented in depth. These impressions have been studied by measuring the slants of perceived surfaces, with probes (rotating arrowheads) designed to respect the distinctive character of depicted scenes. Converging arguments indicated that the perceived orientation of the probes was near theoretical values. A series o...