|Table of Contents|

Laser ranging self-calibration method and system used for image measurement of fatigue cracks in steel bridge decks(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年01期
Page:
60-68
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Laser ranging self-calibration method and system used for image measurement of fatigue cracks in steel bridge decks
Author(s):
HUANG Bin;  CHENG Bin;  ZHOU Huan-xin;  ZENG Ling-bo
(School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)
Keywords:
bridge engineering;  fatigue crack;  image measurement;  laser ranging;  steel bridge deck;  self-calibration method
PACS:
U446
DOI:
10.19721/j.cnki.1671-8879.2025.01.006
Abstract:
Image measurement is an efficient method to detect the fatigue cracks in steel bridge decks, while it is inconvenient to set calibration targets and auxiliary devices or to place the cameras in special poses during the image calibration process, and as a result high-precision, real-time, and dynamic calibration cannot be achieved. To address the above problems, a laser ranging self-calibration method used for the image measurement of fatigue cracks in steel bridge decks was proposed. This method employs high-precision laser rangefinders to synchronously measure the position of the steel plate surface when taking the crack pictures, so that the object plane equation can be determined. Then the 2D coordinates of four sets of points that have been selected respectively from the object plane and the image planes can be obtained, and the homography matrix which represents the mapping relationship between object and image planes can be solved, so that the real-time calibration can be completed simply and rapidly. A set of image measurement system for fatigue cracks in steel bridge decks based on laser ranging self-calibration was independently developed, and the accuracy verification of self-calibration image measurement was carried out in the typical areas of the steel bridge deck. Furthermore, the image measurement of fatigue cracks in the steel bridge deck was conducted. The image feature points of fatigue cracks were extracted by using image processing methods such as grayscale conversion, erosion and dilation, filtering and denoising, binarization, extraction of connected components and medial axis transformation. Combined with the calibration results, the size measurement of various cracks with irregular shapes was realized. The results show that in the accuracy verification of self-calibration image measurement, the measurement relative errors of the ruler's length in the typical areas are all within 0.23%, which indicates that the laser ranging self-calibration method is accurate and robust. In the image measurement of fatigue cracks in the steel bridge decks, the measured values of crack sizes are relatively close to the actual values, and the measurement relative errors are all within 1.35%, providing a reference for the application of this method and system in real engineering.2 tabs, 12 figs, 25 refs.

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Last Update: 2025-02-25