Multiview Cauchy Estimator Feature Embedding for Depth and Inertial Sensor-Based Human Action Recognition

The ever-growing popularity of Kinect and inertial sensors has prompted intensive research efforts on human action recognition. Since human actions were extracted from Kinect and inertial sensors, they can be characterized by multiple feature representations. By encoding the multiview features into a unified space, it could be optimal for human action recognition. In this paper, we propose a new unsupervised feature fusion method termed multiview Cauchy estimator feature embedding (MCEFE) for human action recognition. By minimizing empirical risk, MCEFE integrates the encoded complementary information in multiple views to find the unified data representation and the projection matrices. To enhance robustness to outliers, the Cauchy estimator is imposed on the reconstruction error. Furthermore, ensemble manifold regularization is enforced on the projection matrices to encode the correlations between different views and avoid overfitting. Experiments are conducted on the new Chinese Academy of Sciences—Yunnan University—multimodal human action database to demonstrate the effectiveness and robustness of MCEFE for human action recognition.