Generative Adversarial Networks for Facial Expression Recognition in the Wild

The task of modeling and identifying people's emotions using facial cues is a complex problem in computer vision.Normally we approach these issues by identifying Action Units (AUs), which have many applications in Human Computer Interaction (HCI).Although Deep Learning approaches have demonstrated a high level of performance in recognizing AUs and emotions, they require large datasets of expert-labelled examples.In this article, we demonstrate that good deep features can be learnt in an unsupervised fashion using Deep Convolutional Generative Adversarial Networks (DCGANs), allowing for a supervised classifier to be learned from a smaller labelled dataset.The paper primarily focuses on two key aspects: firstly, the generation of facial expression images across a wide range of poses (including frontal, multi-view, and unconstrained environments), and secondly, the analysis and classification of emotion categories and Action Units.We demonstrate an enhanced ability to generalize and achieve successful results by using a different methodology and a variety of datasets for feature extraction and classification.Our method has been thoroughly tested through multiple experiments on different databases, leading to promising results.