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Improving Neural Network Detection Accuracy of Electric Power Bushings in Infrared Images by Hough Transform

School of Electrical & Electronic Engineering, North China Electric Power University, Baoding 071003, China
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Sensors 2020, 20(10), 2931; https://doi.org/10.3390/s20102931
Received: 23 April 2020 / Revised: 15 May 2020 / Accepted: 18 May 2020 / Published: 21 May 2020
(This article belongs to the Section Physical Sensors)
To improve the neural network detection accuracy of the electric power bushings in infrared images, a modified algorithm based on the You Only Look Once version 2 (YOLOv2) network is proposed to achieve better recognition results. Specifically, YOLOv2 corresponds to a convolutional neural network (CNN), although its rotation invariance is poor, and some bounding boxes (BBs) exhibit certain deviations. To solve this problem, the standard Hough transform and image rotation are utilized to determine the optimal recognition angle for target detection, such that an optimal recognition effect of YOLOv2 on inclined objects (for example, bushing) is achieved. With respect to the problem that the BB is biased, the shape feature of the bushing is extracted by the Gap statistic algorithm, based on K-means clustering; thereafter, the sliding window (SW) is utilized to determine the optimal recognition area. Experimental verification indicates that the proposed rotating image method can improve the recognition effect, and the SW can further modify the BB. The accuracy of target detection increases to 97.33%, and the recall increases to 95%. View Full-Text
Keywords: infrared image; power apparatus bushing; standard hough transform; target detection; YOLOv2; CNN infrared image; power apparatus bushing; standard hough transform; target detection; YOLOv2; CNN
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Zhao, H.; Zhang, Z. Improving Neural Network Detection Accuracy of Electric Power Bushings in Infrared Images by Hough Transform. Sensors 2020, 20, 2931.

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