Two-dimensional change measurement algorithm of crack under micro shooting condition

doi:10.13474/j.cnki.11-2246.2024.0119

Bulletin of Surveying and Mapping ›› 2024, Vol. 0 ›› Issue (1): 115-119,125.doi: 10.13474/j.cnki.11-2246.2024.0119

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Two-dimensional change measurement algorithm of crack under micro shooting condition

YANG Chengxiang¹, DING Yong¹, LI Denghua^2,3

1. School of Science, Nanjing University of Science and Technology, Nanjing 210094, China;
2. Nanjing Hydraulic Research Institute, Nanjing 210024, China;
3. Key Laboratory of Reservoir Dam Safety, Ministry of Water Resources, Nanjing 210024, China

Received:2023-03-29 Online:2024-01-25 Published:2024-01-30

Abstract

Abstract: Structural crack change is a common disease in building structures. In view of the shortcomings of the existing two-dimensional crack detection technology under macro photography, this paper designs a target that can adapt to macro photography according to the equivalent physical model of crack change, and develops a two-dimensional crack change detection algorithm. The algorithm consists of target target location, distortion parameter correction, crack parameter calculation and other parts. A micro-range image acquisition device is designed by combining raspberry pie and camera. Based on the indoor test verification, the measurement accuracy of the crack width change under the micro-distance photography is within 0.1 mm.

Key words: macro photography, image correction, projective transformation, crack changes, digital image

CLC Number:

P258

YANG Chengxiang, DING Yong, LI Denghua. Two-dimensional change measurement algorithm of crack under micro shooting condition[J]. Bulletin of Surveying and Mapping, 2024, 0(1): 115-119,125.

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Two-dimensional change measurement algorithm of crack under micro shooting condition

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