Invariant pattern recognition based on centroids

A new method for pattern recognition that is invariant under changes of pos ition, orientation, intensity, and scale is presented. The centroids of obj ects provide unique points that are related to the energy distribution. For obtaining more such unique points a conformal transform can be used to rea rrange the energy distribution of the object. By means of the conformal tra nsform many different centroids can be produced from the same object. A use ful pattern-recognition and object-registration method that yields a positi on-, rotation-, intensity-, and scale-invariant feature vector based on the se centroids can be created. (C) 2000 Optical Society of America OCIS codes : 070.6110, 100.4550, 100.5010, 110.2960, 200.4740.