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

Figure 3

Examples showing our proposed annotation rules. (a) The red line in the figure represents the demarcation line of the labelled area, and the small vehicle located outside the red line is not labelled. (b) Truck (the red signs 2) occludes car (the red signs 1) less than 1/2 of car’s own area, so car is labelled. (c) Truck (the red signs 1) is truncated less than 2/3 of its own area, so the truck is labelled. (d) The description of a special sample (the red signs 1) which is labelled as difficult.

(a)

(b)

(c)

(d)