Single-Pedestrian Detection Aided by Two-Pedestrian Detection

In this paper, we address the challenging problem of detecting pedestrians who appear in groups. A new approach is proposed for single-pedestrian detection aided by two-pedestrian detection. A mixture model of two-pedestrian detectors is designed to capture the unique visual cues which are formed by nearby pedestrians but cannot be captured by single-pedestrian detectors. A probabilistic framework is proposed to model the relationship between the configurations estimated by single- and two-pedestrian detectors, and to refine the single-pedestrian detection result using two-pedestrian detection. The two-pedestrian detector can integrate with any single-pedestrian detector. Twenty-five state-of-the-art single-pedestrian detection approaches are combined with the two-pedestrian detector on three widely used public datasets: Caltech, TUD-Brussels, and ETH. Experimental results show that our framework improves all these approaches. The average improvement is
$9$
percent on the Caltech-Test dataset,
$11$
percent on the TUD-Brussels dataset and
$17$
percent on the ETH dataset in terms of average miss rate. The lowest average miss rate is reduced from
$37$
to percent on the Caltech-Test dataset, from
$55$
to
$50$
percent on the TUD-Brussels dataset and from
$43$
to
$38$
percent on the ETH dataset.