裂纹检测中的匹配滤波器构造方法研究

摘要

匹配滤波技术在基于数字图像处理的裂纹检测领域有着广泛的应用前景.在使用匹配滤波方法对裂纹X光图像进行预处理滤波时,匹配滤波器的选择是否合适直接影响到滤波效果的好坏.本文论证匹配滤波在裂纹图像检测中的优越性,对裂纹检测中所使用的匹配滤波器矩阵的构造方法进行研究,提出构造匹配滤波器时关于滤波器矩阵形态、尺寸和非零元素宽度的3个原则.通过仿真实验,将滤波后裂纹图像的边缘重绘于原始图像上,从而验证本文提出原则的正确性.%The matched filtering has great prospect in the field of crack detection based on digital image processing. The choose of the filter is very important for the result of the matched filtering. In this paper, a demonstration about the superiority of the matched filter used in crack detection is given first of all, and then three principles are given about the method for constructing the matched filter using in crack detection, including the principles of the form, the dimension and the width of the non-zero element of the filter matrix. At last, the principles are testified by simulation experiment, and the crack image edges matched filtering is drew on the original image.