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Machine Vision and Applications

, Volume 28, Issue 1–2, pp 173–183 | Cite as

Smile detection in the wild with deep convolutional neural networks

  • Junkai ChenEmail author
  • Qihao Ou
  • Zheru Chi
  • Hong Fu
Original Paper

Abstract

Smile or happiness is one of the most universal facial expressions in our daily life. Smile detection in the wild is an important and challenging problem, which has attracted a growing attention from affective computing community. In this paper, we present an efficient approach for smile detection in the wild with deep learning. Different from some previous work which extracted hand-crafted features from face images and trained a classifier to perform smile recognition in a two-step approach, deep learning can effectively combine feature learning and classification into a single model. In this study, we apply the deep convolutional network, a popular deep learning model, to handle this problem. We construct a deep convolutional network called Smile-CNN to perform feature learning and smile detection simultaneously. Experimental results demonstrate that although a deep learning model is generally developed for tackling “big data,” the model can also effectively deal with “small data.” We further investigate into the discriminative power of the learned features, which are taken from the neuron activations of the last hidden layer of our Smile-CNN. By using the learned features to train an SVM or AdaBoost classifier, we show that the learned features have impressive discriminative ability. Experiments conducted on the GENKI4K database demonstrate that our approach can achieve a promising performance in smile detection.

Keywords

Smile detection In the wild Deep learning Feature learning Convolution neural network 

Notes

Acknowledgements

The work reported in this paper was supported by a research grant from National Natural Science Foundation of China (project code: 61473243) and a research grant from the Hong Kong Polytechnic University (project code: 4-BCCJ). Junkai Chen would like to acknowledge a postgraduate scholarship from The Hong Kong Polytechnic University.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of Electronic and Information EngineeringThe Hong Kong Polytechnic UniversityKowloonHong Kong
  2. 2.PolyU Shenzhen Research InstituteShenzhenChina
  3. 3.Department of Computer ScienceChu Hai College of Higher EducationTuen MunHong Kong

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