We present the first publicly available annotations for the analysis of face-touching behavior. These annotations are for a dataset composed of audio-visual recordings of small group social interactions with a total number of 64 videos, each one lasting between 12 to 30 minutes and showing a single person while participating to four-people meetings. They were performed by in total 16 annotators with an almost perfect agreement (Cohen's Kappa=0.89) on average. In total, 74K and 2M video frames were labelled as face-touch and no-face-touch, respectively. Given the dataset and the collected annotations, we also present an extensive evaluation of several methods: rule-based, supervised learning with hand-crafted features and feature learning and inference with a Convolutional Neural Network (CNN) for Face-Touching detection. Our evaluation indicates that among all, CNN performed the best, reaching 83.76% F1-score and 0.84 Matthews Correlation Coefficient. To foster future research in this problem, code and dataset were made publicly available (github.com/IIT-PAVIS/Face-Touching-Behavior), providing all video frames, face-touch annotations, body pose estimations including face and hands key-points detection, face bounding boxes as well as the baseline methods implemented and the cross-validation splits used for training and evaluating our models.
