Video-Based Vehicle Counting for Expressway: A Novel Approach Based on Vehicle Detection and Correlation-Matched Tracking Using Image Data from PTZ Cameras

Figure 5

Example errors about our tracking algorithms and schematic diagram of abnormal trajectory points. We define that the forward direction is from near to far and the backward direction is from far to near. (a) The two buses occlude in the backward direction, satisfying the constraints of the tracking algorithm, but the trajectory connection is error. (b) The two trucks travelling in parallel in the forward direction also satisfy the constraints of the tracking algorithm so that the trajectory connection is wrong. (c) A schematic representation of the trajectory points of two trucks travelling in parallel for a period of time.

(a)

(b)

(c)