Scientific Journal

Applied Aspects of Information Technology

DEEP LEARNING TECHNOLOGY OF CONVOLUTIONAL NEURAL NETWORKS FOR FACIAL EXPRESSION RECOGNITION
Abstract:
The application of deep learning convolutional neural networks for solving the problem of automated facial expression  recognition and determination of emotions of a person is analyzed. It is proposed to use the advantages of the transfer approach to  deep learning convolutional neural networks training to solve the problem of insufficient data volume in sets of images with different  facial expressions. Most of these datasets are labeled in accordance with a facial coding system based on the units of human facial  movement. The developed technology of transfer learning of the public deep learning convolutional neural networks families  DenseNet and MobileNet, with the subsequent “fine tuning” of the network parameters, allowed to reduce the training time and  computational resources when solving the problem of facial expression recognition without losing the reliability of recognition of  motor units. During the development of deep learning technology for convolutional neural networks, the following tasks were solved.  Firstly, the choice of publicly available convolutional neural networks of the DenseNet and MobileNet families pre-trained on the  ImageNet dataset was substantiated, taking into account the peculiarities of transfer learning for the task of recognizing facial  expressions and determining emotions. Secondary, a model of a deep convolutional neural network and a method for its training have  been developed for solving problems of recognizing facial expressions and determining human emotions, taking into account the  specifics of the selected pretrained convolutional neural networks. Thirdly, the developed deep learning technology was tested, and  finally, the resource intensity and reliability of recognition of motor units on the DISFA set were assessed. The proposed technology  of deep learning of convolutional neural networks can be used in the development of systems for automatic recognition of facial  expressions and determination of human emotions for both stationary and mobile devices. Further modification of the systems for  recognizing motor units of human facial activity in order to increase the reliability of recognition is possible using of the augmentation technique.
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DOI
https://doi.org/10.15276/aait.02.2021.6
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