1. Signal Image and Systems Laboratory, HTTTC Ebolowa, University of Yaoundé I, P.O. Box 886, Yaoundé, Cameroon
2. Centre for Research, Experimentation and Production, HTTTC Ebolowa, University of Yaoundé 1, P.O. Box 886, Ebolowa, Cameroon
3. Ingénierie Mathématique et Systèmes d’Information, National Advanced School of Engineering, University of Yaoundé I, P.O. Box 8390, Yaoundé, Cameroon
4. Laboratoire d’Automatique et d’Informatique Appliquée (LAIA), Department of Engineering, IUT-FV Bandjoun, University of Dschang, Dschang, Cameroon