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A significant drawback of the symmetry set evaluation for a 2D shape using the wave diffusion process1 is its slow execution time caused, in large part, by the diffusion step. We first recall the need for a diffusion process. A parallel implementation of the wave diffusion algorithm on a transputer network is presented. A faster alternative approach to detect the symmetry set, which we call the normal transform, and which is similar to the wave propagation mechanism, is described.

Original publication




Journal article


International Journal of Pattern Recognition and Artificial Intelligence

Publication Date





291 - 306