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| Infrared and Visible Image Matching Method for Power Equipment Based on Local and Global Features |
| Feng Xugang1,2,3, Ruan Shanhui3, Wang Zhengbing1,2,3, An Shuo3, Zhang Keqi3 |
1. Anhui Province Engineering Laboratory of Intelligent Demolition Equipment Anhui University of Technology Maanshan 243032 China;
2. Anhui Engineering Research Center for Intelligent Applications and Security of Industrial Internet Anhui University of Technology Maanshan 243032 China;
3. School of Electrical and Information Engineering Anhui University of Technology Maanshan 243032 China |
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Abstract The most intuitive manifestation of power equipment failure is temperature abnormality, through the fusion of infrared and visible images of power equipment can realize the analysis and detection of equipment operation status. Aiming at the problem that the matching process of infrared and visible images of power equipment is greatly affected by the local intensity difference of the images and the difficulty of feature point description and matching, an infrared and visible image matching method for power equipment based on local and global features is proposed.
First, the infrared and visible images of power equipment undergo preprocessing through grayscale conversion and normalization. The Canny algorithm is then applied to extract prominent contour features. Secondly, a threshold is set to solve the problem of possible misestimation in k-cosine estimation of curvature. Then the feature points in the contour image are detected separately by the multi-scale corner detection algorithm based on arithmetic mean k-cosine curvature. The proposed curvature adaptive weighting-based principal direction assignment method is used to assign feature principal directions to each feature point to achieve scale and rotation invariance. Then the PIIFD and global context descriptor are constructed for each feature point, and the proposed similarity bidirectional matching method is utilized to complete the preliminary matching. Finally, the RANSAC algorithm is used to obtain the final matching results and thus the parameters of the affine transformation model between images.
The experimental results show that the algorithm in this paper successfully matches 10 groups of images, and the average accuracy of the proposed method is 93.41%, and the average repetition rate is 33.56%, which verifies that the matching method in this paper can effectively match the infrared and visible images of power equipment. Compared with PIIFD, LGHD and CAO matching algorithms, the number of correct matching points is significantly increased, the average accuracy is improved by 50.71, 27.62 and 11.11 percentage points compared with the other three algorithms, and the average repetition rate is improved by 27.69, 28.81 and 19.18 percentage points respectively. The accurate matching with visible images can still be realized after scaling and rotating changes to the infrared images respectively.
The contributions of the proposed infrared and visible image matching method for power equipment based on local and global features are as follows: (1) The improved k-cosine curvature can accurately reflect the curvature meaning, and a large number of feature points with high accuracy and scale invariance can be extracted by multi-scale arithmetic mean curvature feature detection. (2) The principal orientation assignment method based on curvature adaptive weighting proposed in this paper is robust when small-angle rotations occur between image pairs. (3) By proposing a feature description method that combines global context information with local feature information, the effect of local intensity differences on the matching results is effectively overcome, and infrared and visible image matching with scale invariance is realized.
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Received: 02 April 2024
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2025, Vol. 40 
