Group emotion recognition in the wild is a challenging problem, due to the
unstructured environments in which everyday life pictures are taken. Some of
the obstacles for an effective classification are occlusions, variable lighting
conditions, and image quality. In this work we present a solution based on a
novel combination of deep neural networks and Bayesian classifiers. The neural
network works on a bottom-up approach, analyzing emotions expressed by isolated
faces. The Bayesian classifier estimates a global emotion integrating top-down
features obtained through a scene descriptor. In order to validate the system
we tested the framework on the dataset released for the Emotion Recognition in
the Wild Challenge 2017. Our method achieved an accuracy of 64.68% on the test
set, significantly outperforming the 53.62% competition baseline.

本文提出了一种基于深度神经网络和贝叶斯分类器的新型解决方案，其中神经网络分析单个面孔表情，贝叶斯分类器通过场景描述符估计全局情感。在 Emotion Recognition in the Wild Challenge 2017 数据集上测试，该方法在测试集上的准确率为 64.68％，显著优于竞争基线 53.62％。