Emotion Recognition Using Fusion of Audio and Video Features
This work addresses emotion recognition for applications like human-computer interaction, but it is incremental as it builds on existing fusion methods with preprocessing and post-processing improvements.
The paper tackles continuous emotion recognition by fusing audio and video features to predict arousal and valence levels, achieving concordance correlation coefficients of 0.749 for arousal and 0.565 for valence on the RECOLA dataset.
In this paper we propose a fusion approach to continuous emotion recognition that combines visual and auditory modalities in their representation spaces to predict the arousal and valence levels. The proposed approach employs a pre-trained convolution neural network and transfer learning to extract features from video frames that capture the emotional content. For the auditory content, a minimalistic set of parameters such as prosodic, excitation, vocal tract, and spectral descriptors are used as features. The fusion of these two modalities is carried out at a feature level, before training a single support vector regressor (SVR) or at a prediction level, after training one SVR for each modality. The proposed approach also includes preprocessing and post-processing techniques which contribute favorably to improving the concordance correlation coefficient (CCC). Experimental results for predicting spontaneous and natural emotions on the RECOLA dataset have shown that the proposed approach takes advantage of the complementary information of visual and auditory modalities and provides CCCs of 0.749 and 0.565 for arousal and valence, respectively.