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Plantar pressure image classification employing residual-network model-based conditional generative adversarial networks: a comparison of normal, planus, and talipes equinovarus feet

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Abstract

The number of deep learning (DL) layers increases, and following the performance of computing nodes improvement, the output accuracy of deep neural networks (DNN) faces a bottleneck problem. The resident network (RN) based DNN model was applied to address these issues recently. This paper improved the RN and developed a rectified linear unit (ReLU) based conditional generative adversarial nets (cGAN) to classify plantar pressure images. A foot scan system collected the plantar pressure images, in which normal (N), planus (PL), and talipes equinovarus feet (TE) data-sets were acquired subsequently. The 9-foot types named N, PL, TE, N-PL, N-TE, PL-N, PL-TE, TE-N, and TE-PL were classified using the proposed DNN models, named resident network-based conditional generative adversarial nets (RNcGAN). It improved the RN structure firstly and the cGAN system hereafter. In the classification of plantar pressure images, the pixel-level state matrix can be direct as an input, different from the previous image classification task with image reduction and feature extraction. cGAN can directly output the pixels of the image without any simplification. Finally, the model achieved better results in the evaluation indicators of accuracy (AC), sensitivity (SE), and F1-measurement (F1) by comparing to artificial neural networks (ANN), k-nearest neighbor (kNN), Fast Region-based Convolution Neural Network (Fast R-CNN), visual geometry group (VGG16), scaled-conjugate-gradient convolution neural networks (SCG-CNN), GoogleNet, AlexNet, ResNet-50–177, and Inception-v3. The final prediction of class accuracy is 95.17%. Foot type classification is vital for producing comfortable shoes in the industry.

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Funding

This work is supported by Huidong County Footwear Technology Innovation Center Construction Project of Guangdong Provincial Department of Science and Technology under No. 2017B090922003. The sponsor provided experimental design method, foot scan system and device, data collect and analysis.

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Authors and Affiliations

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Contributions

J. H.: Conceptualization, Methodology, Data curation, Writing—original draft preparation. D. W., Visualization, Validation; Z. L.: Writing—reviewing & editing, Supervision. N. D.: Visualization, Validation. R. G. C.: Validation, and Investigation F. S.: Software, Validation, and Investigation.

Corresponding author

Correspondence to Zairan Li.

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Conflicts of interest

Jianlin Han, Dan Wang, Zairan Li, Nilanjan Dey, and Fuqian Shi declare that they have no conflict of interest.

Ethics approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants involved in the study.

Consent to participate

The foot scan data-set was collected in accordance with the code of conduct of research with human material in China. This study was approved by the ethical committee of the Huizhou University. All subjects gave written informed consent.

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All presentations of case reports have consent to publish.

Additional information

Communicated by Mu-Yen Chen.

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Han, J., Wang, D., Li, Z. et al. Plantar pressure image classification employing residual-network model-based conditional generative adversarial networks: a comparison of normal, planus, and talipes equinovarus feet. Soft Comput 27, 1763–1782 (2023). https://doi.org/10.1007/s00500-021-06073-w

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  • DOI: https://doi.org/10.1007/s00500-021-06073-w

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