PhD thesis, University of Ljubljana, 1993. For the initial contour segmentation we use a standard Sobel operator and subsequent thinning with non maximum suppression and hysteresis threshold. Contour segments Proximity Collinearity Curvilinearity 1D Parallelism Symmetry 2 x 1D Closure 2D Fig. Image Analysis Using Parametric Models . PhD thesis, University of Ljubljana, 1993.
Parallelism is referred to as a special form of symmetry.
Closure assumptions are formed from proximities or symmetry relations. Gestalt laws of perception, the distinct relations are demonstrated due to McCafferty, Rock Palmer contour segments are often fragmented due to possible . Image Analysis Using Parametric Models . PhD thesis, University of Ljubljana. We present several experiments on real and synthetic range images, where we demonstrate the stability of the results with respect to viewpoint and noise.