1. Henan Key Laboratory of Imaging and Intelligent Processing, PLA Strategic Support Force Information Engineering University, Zhengzhou, China
2. School of Biomedical Engineering, Sun Yat-sen University, Shenzhen, China
3. Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education, Chongqing University, Chongqing, China
4. Department of Electrical and Computer Engineering, University of Massachusetts Lowell, Lowell, MA, USA