Soft morphological filters
Lasse Koskinen, Jaakko T. Astola, Yrjo A. Neuvo · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1991
New morphological operations, called soft morphological operations, are introduced. They maintain most of the properties of standard morphological operations, yet give improved performance under certain conditions. The main difference to standard morphological operations is that soft morphological operations are less sensitive to additive noise and to small variations in the shape of the objects to be filtered.