A Deep Learning System for Recognizing Facial Expression in Real-Time

Abstract

This article presents an image-based real-time facial expression recognition system that is able to recognize the facial expressions of several subjects on a webcam at the same time. Our proposed methodology combines a supervised transfer learning strategy and a joint supervision method with center loss, which is crucial for facial tasks. A newly proposed Convolutional Neural Network (CNN) model, MobileNet, which has both accuracy and speed, is deployed in both offline and in a real-time framework that enables fast and accurate real-time output. Evaluations towards two publicly available datasets, JAFFE and CK+, are carried out respectively. The JAFFE dataset reaches an accuracy of 95.24%, while an accuracy of 96.92% is achieved on the 6-class CK+ dataset, which contains only the last frames of image sequences. At last, the average run-time cost for the recognition of the real-time implementation is around 3.57ms/frame on a NVIDIA Quadro K4200 GPU.