1. Key Laboratory of Image Information Processing and Intelligent Control of Education Ministry of China, School of Automation, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
2. Government Girls Postgraduate College, Kohat 26000, Khyber Pakhtunkhwa, Pakistan
3. Department of Computer Science, University of the Philippines Diliman, Quezon City, Philippines
4. School of Information Science and Engineering, Xiamen University, Xiamen 361005, China