1. Laboratory of Technologies and Applied Sciences, University of Douala, Douala, Cameroon
2. Laboratory of Electrical Engineering, Mechatronic and Signal Treatment, National Advanced School of Engineering, University of Yaounde 1, Yaoundé, Cameroon
3. School of Geology and Mining Engineering, University of Ngaoundéré, Ngaoundéré, Cameroon
4. Signal, Image and Systems Laboratory, Higher Technical Teacher Training College of Ebolowa, University of Ebolowa, Ebolowa, Cameroon
5. Process Systems Engineering Laboratory, Department of Chemical Engineering, University of the Philippines, Quezon City, Philippines
6. College of Physics and Information Engineering, Fuzhou University, Fuzhou, People’s Republic of China