Tracking on Sidewalk (image) University of Washington Share Print E-Mail 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. Share Print E-Mail 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.