Age Should Not Matter: Towards More Accurate Pedestrian Detection via Self-Training
Shunsuke Kogure, Kai Watabe, Ryosuke Yamada, Yoshimitsu Aoki, Akio Nakamura, Hirokatsu Kataoka · 2022
Why is there disparity in the miss rates of pedestrian detection between different age attributes? In this study, we propose to (i) improve the accuracy of pedestrian detection using our pre-trained model; and (ii) explore the causes of this disparity. In order to improve detection accuracy, we extend a pedestrian detection pre-training dataset, the Weakly Supervised Pedestrian Dataset (WSPD), by means of self-training, to construct our Self-Trained Person Dataset (STPD). Moreover, we hypothesize that the cause of the miss rate is due to three biases: (1) the apparent bias towards “adults” versus “children”; (2) the quantity of training data bias against “children”; and (3) the scale bias of the bounding box. In addition, we constructed an evaluation dataset by manually annotating “adult” and “child” bounding boxes to the INRIA Person Dataset. As a result, we confirm that the miss rate was reduced by up to 0.4% for adults and up to 3.9% for children. In addition, we discuss the impact of the size and appearance of the bounding boxes on the disparity in miss rates and provide an outlook for future research.