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A novel modular deep fully convolutional network for efficient low resolution facial expression recognition

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Abstract

Facial expression is one of the most important and natural way to express human feelings. Although deep convolutional neural networks have improved the performance of facial expression recognition (FER) systems, recognizing facial expressions from low resolution images is still a challenging task for real-time applications. A new modular deep fully convolutional neural network is designed to tackle this problem. The proposed network is composed of four modules namely, feature extraction (FE), residual spatial-channel attention (RSCA), atrous spatial pyramid pooling (ASPP), and classification module. The prominent facial regions relevant to facial expressions are extracted using FE module and then strengthened using RSCA and ASPP modules. Finally, a classification module using convolutional layers with adjusted stride parameter values is employed instead of fully connected layers to significantly reduce the number of learnable parameters. Experimental results using CK+, RAF-DB, and SFEW 2.0 datasets show that our proposed method achieves improved accuracies of 99.9%, 84.96%, and 53.0% at image resolutions of \(32\times 32\), \(48\times 48\), and \(26\times 26\), respectively.

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Availability of data and materials

The datasets used in the current study are available in the below links. RAF-DB: http://www.whdeng.cn/raf/model1.html. SFEW 2.0: https://cs.anu.edu.au/few/emotiw2015.html. CK+: https://www.pitt.edu/~emotion/ck-spread.htm. FER-2013: https://www.kaggle.com/c/challenges-in-representation-learning-facial-expression-recognition-challenge.

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Acknowledgements

Walaa Aly would like to thank the Deanship of Scientific Research at Majmaah University for supporting this work under Project No. R-2023-103.

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Aly, W., Shahin, A.I. & Aly, S. A novel modular deep fully convolutional network for efficient low resolution facial expression recognition. J Ambient Intell Human Comput 14, 7747–7759 (2023). https://doi.org/10.1007/s12652-023-04586-w

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