Vision positioning system is the key technology for improving the accuracy of high pre-cision mounter.The machine vision was proposed to detect the deviation of surface mounted technology(SMT)components and PCB board.The regional growth method and the maximum internal rectangle method were used to calculate the displacement and angle center of the SMT components and PCB board,respectively,and the displacement and angle that needed correction were obtained.Experiments show that the detection accuracy of the component center can reach 30 μm and the total processing time is 63.6 ms,so it can meet the requirements for fast detection of mounting components with high precision.%高精度贴片机的视觉定位系统是提高贴片精度的关键.利用机器视觉技术分别对贴片元件和PCB板的位置及角度偏差进行检测.采用了以区域生长法为基础的元件中心和角度的计算方法,以最大内接矩形法计算了PCB板的中心和角度,从而得到了需要纠偏的位移和角度.实验验证元件中心的检测精度可达30 μm,算法处理总时间为63.6 ms,满足贴装元件定位检测系统对高速高精度的要求.
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