Typical track demonstrating the pursuit process. The algorithm operates pair-step-wise, going from one pair group to the next. In this case, it starts with a pair from the second group. Because the origin lies in the first half of the image sequence, the candidate track is first tracked forward, then backward in time (indicated by the circled numbers). If no suitable pair is found at a given step, the algorithm switches to searching for suitable single detections (single-step) instead, starting with the detection set that is closer in time to the previous step. The algorithm only searches the second set as well if it finds no suitable detection in the first. Afterwards, the pair-tracking continues. The track’s color gradient from red to yellow indicates the direction of time (and therefore the object’s motion through space). While the red ellipses mark the detections that make up the track, the black, dashed circles indicate where detections are missing. The background image is part of the stacked image similar to Fig. 4.