基于尺寸公差和图像处理的刹车片尺寸检测
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1.中国计量大学质量与安全工程学院杭州310018;2.中国计量大学计量测试工程学院 杭州310018;3.杭州市质量技术监督检测院杭州310019

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TP391.41TH124

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Brake pad dimension detection based on dimension tolerance and image processing
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1. College of Quality & Safety Engineering, China Jiliang University, Hangzhou 310018, China; 2.College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, China;3.Hangzhou Quality and Technology Supervision and Inspection Institute, Hangzhou 310019, China

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    摘要:

    刹车片尺寸检测是刹车片质量的重要指标之一。为了快速综合检测刹车片尺寸,提出了基于公差设计原则和图像处理的综合尺寸检测方法。首先根据图纸要求利用尺寸公差设计原理逆向设计刹车片尺寸允许公差控制带,作为综合尺寸检测标准模板图;其次,利用CCD相机采集待检刹车片图像以及进行滤波、二值化处理,得到二值图像并利用最小外接矩形优化算法确定其放缩倍数,得到与标准模板图相同的像素尺寸标准的实际图;最后利用实际图与标准模板图两圆心坐标连线中点位置截图相同大小的两幅图,并且将实际图进行边缘检测得到实际轮廓图,然后将实际轮廓图与标准模板图进行加法运算,利用白色像素点数与标准模版图白色像素点数差异得到检测结果。实验结果表明,检测精度可达到1个像素尺寸,检测速度5 s一片,并且可以检测出刹车片所有待检尺寸是否合格。

    Abstract:

    Brake pad dimension detection is one of the important indices of brake pad quality. In order to quickly and comprehensively detect the dimension of the brake pad, this paper presents a comprehensive brake pad dimension detection method based on tolerance design principle and image processing. Firstly, according to the requirements of the design drawings, the dimension tolerance design principle is used to reversely design the brake pad allowable dimension tolerance control zone, which is taken as the comprehensive dimension test standard template. Secondly, the CCD camera is used to acquire the image of the brake pad to be tested, which is then filtered, processed with binarization; a binary image is obtained and the minimum circumscribed rectangle optimization algorithm is used to determine the scaling factor, and the actual image the same as the standard template in pixel scale is obtained. Finally, at the midpoint of the line connecting two cycle center coordinates of the actual image and standard template, two images with same size are cut out. Edge detection is performed on the actual image to get the actual contour image, then the actual contour image and the standard template are added up, and then from the difference of the numbers of the white pixels for the added image and standard template, the detection result is obtained.The experiment result shows that the detection accuracy can reach 1 pixel, the detection speed reaches 1 piece per 5 seconds, and the proposed method can detect weather all the dimensions of the brake pad are qualified.

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徐志玲,胡琳丽,陈杨,厉志飞.基于尺寸公差和图像处理的刹车片尺寸检测[J].仪器仪表学报,2017,38(9):2317-2325

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  • 在线发布日期: 2017-11-01
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