Scale space semi-local invariants

摘要

in this paper we discuss a new approach to invariant signatures for recognizing curves under viewing distortions and partial occlusion. The approach is intended to overcome the ill-posed problem of finding derivatives, on which local invariants usually depend. The basic idea is to use invariant finite differences, with a scale parameter that determines the size of the differencing interval. The scale parameter is allowed to vary so that we obtain a 'scale space'-like invariant representation of the curve, with larger Difference intervals corresponding to larger, coarser scales.