Affiliation: | a Intelligent Autonomous Systems Laboratory, Department of Information Engineering (DIE), Faculty of Engineering, The University of Padua, Via Gradenigo 6/a, 35131, Padova, Italy b VStone Co. Ltd., Shimaya 4-2-7, Konohana, Osaka 554-0024, Japan c Department of Adaptive Machine Systems, Osaka University, Suita, Osaka 565-0871, Japan |