PureGaze: Purifying Gaze Feature for Generalizable Gaze Estimation.

Gaze estimation methods learn eye gaze from facial features. However, among rich information in the facial image, real gaze-relevant features only correspond to subtle changes in eye region, while other gaze-irrelevant features like illumination, personal appearance and even facial expression may affect the learning in an unexpected way. This is a major reason why existing methods show significant performance degradation in cross-domain/dataset evaluation. In this paper, we tackle the domain generalization problem in cross-domain gaze estimation for unknown target domains. To be specific, we realize the domain generalization by gaze feature purification. We eliminate gaze-irrelevant factors such as illumination and identity to improve the cross-dataset performance without knowing the target dataset. We design a plug-and-play self-adversarial framework for the gaze feature purification. The framework enhances not only our baseline but also existing gaze estimation methods directly and significantly. Our method achieves the state-of-the-art performance in different benchmarks. Meanwhile, the purification is easily explainable via visualization.