Curved inertia frames and the skeleton sketch: Finding salient frames of reference

A model for global symmetry detection in dense images

“…Several representations based on local symmetry have been proposed in computer vision, such as the Symmetrical Axis Transform (Blum and Nagel, 1978), the Smoothed Local Symmetry Transform (Brady, 1983), and the Local Rotational Symmetry Transform (Fleck, 1986). Recently, Subirana-Vilanova (1990) proposed a method to extract curved axes of symmetry from an image, for the e cient description of object shapes.…”