Tracking on Sidewalk (IMAGE) University of Washington Caption The tracking system first systematically picks out people in a camera frame, then follows each person based on his or her clothing texture, color and body movement. Credit Swiss Federal Institute of Technology Usage Restrictions Photo credit required. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.