Facial Expression Recognition and Analysis of Interclass False Positives Using CNN

In this paper, the performance of Facial Expression Recognition (FER) using Deep Convolutional Neural Network (DCNN) model is evaluated. The expressions include Angry, Disgust, Fear, Happy, Sad, Surprise, and Neutral. In addition to performance evaluation, the analysis on Interclass false positives are also discussed which helps to analyze the underlying challenges to improve the model. All classifiers give low performance on Fer2013 datasets. DCNN gives 54.46% accuracy on test and 89.52% on training set, whereas, in case of different kernels of Support Vector Machines (SVM), the highest accuracy is 45% using cubic kernel on training set. Experiments show that certain facial expressions have more false positives and few of them are very dominant. In case of Disgust expression, it has Angry as dominant false positive. Based on false positives analysis, binary classifiers can be trained to improve the accuracy of the expressions with dominant false positives. Experiments on Fer2013 dataset confirms that the accuracy of expression Disgust is improved by piping the binary classifiers, Disgust vs. Angry, to existing DCNN of multi-class.