摘要
印刷电路板上连接PIN正位度检测是保证PCB电气可靠性的重要环节,其主要检测PIN缺针、共线度与高度。为满足生产实际需求,提出一种基于双目视觉的连接PIN正位度检测方法。首先,通过双目标定获取相机内外参数,实现图像立体校正;其次,根据先验的相对方位和给定的排列信息生成相应的栅格,基于栅格灰度阈值变化进行PIN缺失检测;然后,分别提取PIN在两个相机视野中对应的特征角点,基于视差原理进行针尖三维坐标计算,实现对PIN的排列共线度检测;最后,提出了基于特征提取的PIN相对高度检测方法,实现了对PIN的相对高度检测。实验结果验证了所提方法的有效性,PIN相对高度检测的平均耗时为125.4 ms,精度达99.535%,重复性精度在±0.05 mm内。
Position detection of connecting PIN on printed circuit board(PCB)is a vital link to ensure the electrical reliability of PCB,which mainly detects missing,collinearity,and height of PIN.In this study,a method for determining the position of the connecting PIN based on binocular vision is proposed to meet the actual needs of production.First,the intrinsic and extrinsic parameters of the cameras are obtained by binocular calibration,and the stereo rectification of images is achieved.Second,the relevant grid is constructed according to the previously provided arrangement information and relative orientation,followed by PIN missing detection using a change of the grid’s gray threshold.Next,to achieve the collinearity detection of PIN arrangement,the feature corner points corresponding to the PIN in two camera fields of view are extracted separately.Furthermore,the three-dimensional coordinates of the pinpoint are determined based on the disparity principle.Finally,a feature extraction-based PIN relative height detection approach is suggested to implement the relative height detection for PINs.The experimental findings support the effectiveness of the proposed method;the average elapsed time of PIN relative height detection is 125.4 ms,the accuracy is 99.535%,and the repeatable accuracy is within±0.05 mm.
作者
刘文超
杨轶睿
汪威
杨昊
翟中生
Liu Wenchao;Yang Yirui;Wang Wei;Yang Hao;Zhai Zhongsheng(School of Mechanical Engineering,Hubei University of Technology,Wuhan 430068,Hubei,China;Hubei Key Laboratory of Modern Manufacturing Quality Engineering,Wuhan 430068,Hubei,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2023年第14期281-289,共9页
Laser & Optoelectronics Progress
基金
国家自然科学基金(32071457)
武汉市科技成果转化专项(2020030603012342)。
关键词
双目视觉
PIN
正位度检测
视差
图像处理
binocular vision
PIN
position detection
disparity
image processing
