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Image-Based Bolt-Loosening Detection Using a Checkerboard Perspective Correction Method.

Chengqian Xie¹, Jun Luo¹, Kaili Li¹

¹School of Civil Engineering and Architecture, Chongqing University of Science and Technology, No. 20, East University Town Road, Shapingba District, Chongqing 401331, China.

Sensors (Basel, Switzerland)

|June 19, 2024

Summary

This summary is machine-generated.

This study introduces an image-correction technique for flange joint bolts using a checkerboard pattern to improve accuracy. The method enhances bolt-loosening detection stability and accuracy, even with fewer correction points.

Keywords:

bolt loosening camera calibration checkerboard flange joints perspective correction

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Area of Science:

Engineering
Computer Vision
Mechanical Systems

Background:

Flange joints are critical in mechanical systems, and bolt integrity is essential for structural safety.
Accurate bolt status monitoring is challenging due to image distortions and camera positioning errors.

Purpose of the Study:

To develop and validate a novel image-correction method for flange joint bolts.
To enhance the stability and accuracy of bolt-loosening detection.
To analyze the influence of various factors on the correction method's performance.

Main Methods:

A checkerboard pattern is used to identify feature points on flange joint bolts.
Homography matrix estimation using multiple feature points corrects image perspective distortion and camera angle deviation.
Analysis of factors including feature point count, camera distance, and light intensity.

Main Results:

The proposed method effectively corrects image distortion and camera position angle deviation.
Using more than four correction points significantly improves the stability of bolt image correction and bolt-loosening detection.
The method remains effective with as few as nine checkerboard points, achieving an average bolt-loosening detection error below 1.5 degrees.

Conclusions:

The developed image-correction technique offers a robust solution for flange joint bolt analysis.
The method demonstrates improved stability and accuracy in detecting bolt loosening.
Optimal camera shooting distances range from 20 cm to 60 cm, with low sensitivity to light intensity.