Pedestrian detection in crowded scenes is a challenging problem since the pedestrians often gather together and occlude each other. In this paper, we propose a new occlusion-aware R-CNN (OR-CNN) to improve the detection accuracy in the crowd. Specifically, we design a new aggregation loss to enforce proposals to be close and locate compactly to the corresponding objects. Meanwhile, we use a new part occlusion-aware region of interest (PORoI) pooling unit to replace the RoI pooling layer in order to integrate the prior structure information of human body with visibility prediction into the network to handle occlusion. Our detector is trained in an end-to-end fashion, which achieves state-of-the-art results on three pedestrian detection datasets, i.e., CityPersons, ETH, and INRIA, and performs on-pair with the state-of-the-arts on Caltech.

本文提出一种新的遮挡感知R-CNN (OR-CNN) 检测算法来提高人群中行人检测的准确率，其中使用的新型聚合损失来将建议的探测框紧密地与相应的对象定位；使用新的部分遮挡感知ROI池化单元来整合人体结构的前期结构信息以及可见性预测到网络中来处理遮挡，此检测器在三个行人检测数据集上达到了最新的结果，并且在Caltech上与最新技术持平。

Occlusion-aware R-CNN: 检测人群中的行人