School of Automation;
Nanjing University of Information Science&Technology;
Nanjing;
210044;
China;
Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology;
Nanjing University of Information Science&Technology;
Nanjing;
210044;
China;
Jiangsu Engineering Center of Network Monitoring;
Nanjing University of Information Science&Technology;
Nanjing;
210044;
China;
Rensselaer Polytechnic Institute;
Troy;
NY 12180;
USA;
Vehicle type recognition; improved Canny algorithm; Gabor filter; k-nearest neighbor classification; grey relational analysis; kernel sparse representation; two-stage classification;