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CCA-Based Fusion of Camera and Radar Features for Target Classification Under Adverse Weather Conditions

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Abstract

Deep learning models such as deep convolutional neural networks (DCNNs) image classifiers have achieved outstanding performance over the last decade. However, these models are mostly trained with high-quality images drawn from publicly available datasets such as ImageNet. Recently, many researchers have evaluated the impact of low-quality image degradations on the performance of different neural network-based image classifiers. But, most of these studies generate low-quality images by synthetic modification of the high-quality images. Besides, most of the studies employed various image processing techniques to remove the image degradations and trained the DCNNs again to achieve better performance. But it has since been discovered that such methods could not improve the classification accuracy of DCNNs. The robustness of DCNNs based image classifiers trained on low-quality images resulting from natural factors common in autonomous driving and other intelligent system settings was rarely studied over the recent years. In this paper, we proposed a canonical correlation analysis (CCA) based fusion of camera and radar features for improving the performance of DCNNs image classifiers trained on natural adverse weather data. CCA is a statistical approach that creates a highly discriminative feature vector by measuring the linear relationship between the camera and radar features. A spatial attention network was designed to re-weight the camera features before associating them with radar features in the CCA-feature fusion block. Our findings based on experimental evaluations have proven that, indeed, the performance of the DCNN models (i.e., Alex-Net and VGG-16-Net) is heavily affected by degradations arising from natural factors. Specifically, the DCNN models are more affected by the degradations arising from rainfall, foggy and nighttime conditions using Radiate and Carrada datasets. However, the proposed fusion frameworks have improved the performance of the individual sensing modalities significantly. The radar data has helped substantially in enhancing the fusion performance, mainly using rainfall data where the camera data is heavily affected.

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Funding

This work was supported in part by the Science and Technology Innovation Project of Xiongan New Area (No. 2022XAGG0181), the Science and Technology Key Project of Fujian Province (No. 2020HZ020005, 2021HZ021004 and 2021H61010115), the National Natural Science Foundation of China (No.U1705263), the President’s Fund of Xiamen University for Undergraduate (No. 20720212006), and the Open Project of State Key Laboratory of Matamaterial Electromagnetic Modulation Technology (No. XM-202204-0024).

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Authors and Affiliations

  1. Department of Information and Communication Engineering, School of Informatics, Xiamen University, 422 Siming South Road, Siming District, Xiamen, 361005, Fujian, China

    Fahad Jibrin Abdu & Zhenmiao Deng

  2. School of Electronic Science and Engineering (National Model Microelectronics College), Xiamen University, Xiamen, 361005, China

    Yixiong Zhang

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  1. Fahad Jibrin Abdu
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Correspondence to Yixiong Zhang.

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Abdu, F.J., Zhang, Y. & Deng, Z. CCA-Based Fusion of Camera and Radar Features for Target Classification Under Adverse Weather Conditions. Neural Process Lett 55, 7293–7319 (2023). https://doi.org/10.1007/s11063-023-11261-w

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