Method and device for measuring tunnel lining cracks
一种测量方法、裂缝的技术,应用在测量装置、采用光学装置、图像数据处理等方向,能够解决拍摄距离随机性、手持接触采集过程繁琐、宽大裂缝的边缘提取方法不适用等问题
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[0064] The present invention will be further described below in conjunction with accompanying drawing.
[0065] Such as figure 1 Shown, a tunnel lining crack measurement method, comprising the following steps:
[0066] (1) collect the image of crack by digital camera, and measure the distance collected by laser range finder;
[0067] (2) Select the area to be measured on the collected image to prevent processing deviation due to the large size of the image and the small target crack, and turn the selected area into a grayscale image;
[0068] (3) Determine the threshold value for the gray image selected above, and perform binary image segmentation to obtain the target area; threshold segmentation is the most common direct detection area technology. However, in the entire image, the range of grayscale variation is large and a single threshold value cannot meet the requirements. The present invention dynamically adopts an adaptive threshold value related to the grayscale chara...
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