1. Department of Computer Science, Norwegian University of Science and Technology, Gjovik, Norway
2. Engineering Research Center of Learning-Based Intelligent System, Ministry of Education, School of Computer Science and Technology, Key Laboratory of Computer Vision and System of Ministry of Education, Tianjin University of Technology, Tianjin, China
3. Jiangsu Province Key Laboratory of Image Processing and Image Communication, Nanjing University of Posts and Telecommunications, Nanjing, China