Affiliation: | aDipartimento di Informatica e Sistemistica, Universitá di Napoli “Federico II, Via Claudio, 21, 80125, Napoli, Italy;bCiticorp Securities, Inc. 399 Park Avenue, 1, New York, New York, 10043;cDepartment of Computer Science, Image Analysis Laboratory, SUNY at Stony Brook, Stony Brook, New York, 11794-4400 |