for some very helpful discussions, and Prof. D. E. Troxel for his help in designing the sensory display.

No abstract

Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. ABSTRACTHough has proposed an interesting and computationally efficient procedure for detecting lines in pictures. In this paper we point out that the use of angle-radius rather than s lope-intercept parameters simplifies the computation further. We also show how the method can be used for more general curve fi tting, and give alternative interpretations that explain the source of its efficiency.