Butterfly Project Report 13 DARPA Parallel Architecture Benchmark Study

In intensive work over a four-week period in the summer of 1986, seven problems were studied and implemented on the Butterfly. The problems were Inspired by various capabilities in computer vision, and were proposed as benchmarks for a DARPA worksho{' on parallel architectures. They were: convolution and zero-crossing detectlOn for edges, edge tracking, connected component labeling, hough transform, three computational geometry problems (convex hull, voronoi diagram, and minimum spanning tree), three-dimensional visibility calculations, subgraph isomorphism and minimum cost path calculation. BPRs 10,11, and 14 are detailed reports on three of the problems. BPR13 contains the conclusions of the study and writeups of the work not covered in other BPRs. This work was supported in part by the Defense Advanced Research Projects Agency U.S. Army Topographic Labs under grant number DACA76-85-C-0001 and in part by the National Science Foundation under grant number DCR-8320136.