Human in Events

Challenge and Dataset on Large-scale Human-centric Video Analysis in Complex Events (HiEve)


The task of re-identifying groups of people under different camera views [1, 2], is an important yet less-studied problem. Group re-identification (Re-ID) is a very challenging task since it is not only adversely affected by common issues in traditional single object Re-ID problems such as viewpoint and human pose variations, but it also suffers from changes in group layout and group membership. In order to facilitate the research of Group Re-ID, we propose a new Road Group dataset [1]. It consists of 162 group pairs taken from a 2-camera-view of a crowded road scene. The bounding box coordinates of totally 1099 pedestrians are also provided. This dataset is challenging due to its large variation of group layout and human pose.


The image collections and annotations of our dataset can be downloaded here:

Road Group Dataset Images
Road Group Dataset Annotations


We provide 3 different kinds of annotations, the group id annotations, the single pedestrian correspondance annotations and single pedestrian bounding box annotations. Besides, we also provide the three kinds of annotation obtained via our detection results as mentioned in our paper [1].

The group id annotations is a json file with the following format. The field "id" is the group id number, "image name" denotes the names of images containing this group.
  "id": int,
  "image names" [str, str]

The single pedestrian bounding box annotations is a json file with the following format. The field "image name" denotes the name of group image. The "pedestrian" field is a list of person annotation type, which includes two sub-fields. The "person id" field is the index of the person within this group and the "bbox" field is the bounding box corrdinate of the person.
  "image name": str,
  "pedestrian": [person, person, ....]
  "person id": int,
  "bbox": [xmin, ymin, xmax, ymax]

The single pedestrian correspondance annotations indicate the individual correspondance between two matched groups. It is a json file with the following format. The field "group pair" is the list containing names of two images, and the "person pairs" field denotes the correspondance relationship between people in the two images, which is a list of person_pair annotation type. The person_pair annotation type includes two fields, "person1 id" and "person2 id", which denote the person ids in the first and second group in the group pair.
  "group pair": [str, str],
  "person pairs": [person_pair, person_pair, ...]
  "person1 id": int,
  "person2 id": int


[1] Group re-identification: leveraging and integrating multi-grain information. ACM Multimedia (MM), 2018

[2] Group Re-Identification with Hybrid Attention Model and Residual Distance. In: Proceedings of the IEEE International Conference on Image Processing. pp. 1217-1221 (2019)

Contact: humaninevents AT or humaninevents AT Any question related to the challenge participation, dataset, etc, please feel free to send email to the contact mailbox.