基于Canny的自适应换热器板片边缘检测方法  

An Adaptive Edge Detection Method for Plate of Heat Exchanger Based on Canny

作　　者：苑玮琦[1] 赵佩瑶 YUAN Wei-qi;ZHAO Pei-yao(Key Laboratory of Machine Vision in Liaoning Province,Visual Inspection Institute of Shenyang University of Technology,Shenyang 110870,China;School of Information Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学视觉检测技术研究所辽宁省机器视觉重点实验室,辽宁沈阳110870 [2]沈阳工业大学信息科学与工程学院,辽宁沈阳110870

出　　处：《计算机技术与发展》2021年第11期81-85,94,共6页Computer Technology and Development

基　　金：国家自然科学基金(61271365)。

摘　　要：板式换热器板片型号多达上百种,每种型号的材质与结构也不尽相同,对不同亮暗不同纹理的区域进行定位,使用固定阈值的边缘检测方法难以保障检测结果。针对此问题,提出一种基于Canny的自适应板式换热器板片边缘检测方法。该方法根据不同型号的波纹板自动调整边缘检测参数,其中包括标准差、高低阈值,使其与所处理的波纹结构相适应,以达到最佳的边缘定位效果。通过数学模型推导出标准差与边缘宽度以及高低阈值与边缘高度之间的关系,利用梯度极大值找出图像中像素值发生跃迁的位置来得到粗略的边缘点信息,将极大值所获得的灰度过渡带与水平灰度剖面线做交集得到边缘的宽度与高度,就此获得Canny边缘检测的理想参数。实验结果表明,该方法能有效解决不同型号板片对区域定位的影响,为Canny算子在钢材边缘检测的应用提供了新的思路和技术参考。There are as many as hundreds of plate types of plate heat exchanger,with different materials and structures for each type.The edge detection method with fixed threshold is difficult to guarantee the detection results when locating the regions with different light and dark textures.To solve this problem,a Canny adaptive plate heat exchanger plate edge detection method is proposed.The edge detection parameters,such as standard deviation and high and low thresholds,are automatically adjusted according to different types of corrugated plates,so that they could be adapted to the processed corrugated structure to achieve the best edge positioning effect.First mathematical model is deduced by the standard deviation and edge width,and the relationship between the high and low threshold and edge height,and then the rough edge point information is obtained by using the gradient maximum value to find the position where the pixel value transitions in the image.The gray transition zone obtained by the maximum value is intersected with the horizontal gray profile line to obtain the width and height of the edge,thus obtaining the ideal parameter of Canny edge detection.The experiment shows that the proposed method can effectively solve the influence of different types of plates on regional positioning,and provides a new idea and technical reference for the application of Canny operator in steel edge detection.

关 键 词：板式热交换器 边缘检测 CANNY算法 自适应阈值 梯度极大值 

分 类 号：TP302[自动化与计算机技术—计算机系统结构]