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Evaluation of Smile Detection Methods with Images in Real-World Scenarios

  • Zhoucong Cui
  • Shuo Zhang
  • Jiani Hu
  • Weihong Deng
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9010)

Abstract

Discriminative methods such as SVM, have been validated extremely efficient in pattern recognition issues. We present a systematic study on smile detection with different SVM classifiers. We experimented with linear SVM classifier, RBF kernel SVM classifier and a recently-proposed local linear SVM (LL-SVM) classifier. In this paper, we focus on smile detection in face images captured in real-world scenarios, such as those in GENKI4K database. In the meantime, illumination normalization, alignment and feature representation methods are also taken into consideration. Compared with the commonly used pixel-based representation, we find that local-feature-based methods achieve not only higher detection performance but also better robustness against misalignment. Almost all the illumination normalization methods have no effect on the detection accuracy. Among all the SVM classifiers, the novel LL-SVM is verified to find a balance between accuracy and efficiency. And among all the features including pixel value intensity, Gabor, LBP and HOG features, we find that HOG features are the most appropriate features to detect smiling faces, which, combined with RBF kernel SVM, achieve an accuracy of \(93.25\,\%\) on GENKI4K database.

Notes

Acknowledgement

This work was partially sponsored by National Natural Science Foundation of China (NSFC) under Grant No. 61375031, No. 61471048, and No. 61273217. This work was also supported by the Fundamental Research Funds for the Central Universities, Beijing Higher Education Young Elite Teacher Project, and the Program for New Century Excellent Talents in University.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Zhoucong Cui
    • 1
  • Shuo Zhang
    • 1
  • Jiani Hu
    • 1
  • Weihong Deng
    • 1
  1. 1.Beijing University of Posts and TelecommunicationsBeijingChina

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