基于双目视觉的裂缝三向变化检测方法研究

Research on Three-way Crack Change Detection Method Based on Binocular Vision

为解决传统裂缝三向检测方法成本高、效率低的问题,提出了一种基于双目视觉的裂缝三向变化检测方法。首先建立裂缝三维等效模型,将裂缝变化计算等效为计算标靶间变化情况;然后通过特征点编码匹配、空间坐标系变换、三维坐标计算等对裂缝进行三维重建,量化裂缝三向变化情况;最后通过单轴位移试验验证了该方法的精度。结果表明,裂缝的开合方向和平行于裂缝表面的错动方向最大测量误差在0.2 mm以内,垂直于裂缝表面的错动方向的最大测量绝对误差在0.3 mm以内,满足《土石坝安全监测技术规范》中对于裂缝检测的要求。

To solve the disadvantage of high cost and low efficiency in the traditional three-way crack detection methods, a three-dimensional crack change detection method based on binocular vision was proposed. Three-dimensional equivalent model of crack change was established, and the calculation of crack changes was equivalent to the calculation of changes between targets. Three-dimensional reconstruction of cracks was carried out through feature point code matching, spatial coordinate system transformation, three-dimensional coordinate calculation, and the three-dimensional situation of the fracture change was obtained. To verify the accuracy of the method, a unidirectional displacement test was carried out. The results show that the maximum measurement error of the opening and dislocation of the crack is within 0.2 mm, and the maximum measurement absolute error of settlement of the crack is within 0.3 mm, which meets the requirements for crack detection in technical specification for earth-rockfill dam safety monitoring.