1. I3S Laboratory, Côte d’Azur University, CNRS, 06900 Sophia Antipolis, France
2. Univ. Grenoble Alpes, CNRS, Inria, Grenoble INP, GIPSA-Lab, 38000 Grenoble, France
3. Faculty of Science (Auckland Park Campus), University of Johannesburg, Johannesburg 2006, South Africa