A linear crack length measurement method for railway bridges based on calibration points fitting

For the linear crack skeleton of railway bridges with irregular strike,it is difficult to accurately express the crack contour feature by using a single smoothing fitting algorithm.In order to improve the measurement accuracy,a polynomial curve fitting was proposed,which used the calibration point of crack contour as the boundary point,and then put them all together to produce a continuous contour curve to achieve the crack length measurement.The method was tested by measuring the linar cracks with different shapes.It is shown that this proposed algorithm can not only solve the jagged problem generated in the crack skeleton extraction process,but also improve the crack length measurement accuracy.The relative deviation is less than 0.15,and the measurement accuracy is over 98.05%,which provides a more effective means for the crack length measurement in railway bridges.

一种基于编辑距离的汉代画像石裂缝的检测算法

为了得到更好的画像石裂缝区域的检测结果,提出了一种基于编辑距离的画像石裂缝的检测算法。将图像分为若干个大小相等的区域;为了将裂缝区域与背景区域区分开,计算各个区域之间的编辑距离,生成裂缝掩模图像;利用形态学中的膨胀运算进行掩模图中的空白区域填充;通过为掩模图像设定阈值完成对裂缝区域的标定。实验结果表明,该算法可以对汉代画像石的裂缝区域进行精确检测。