PCB钻孔自动光电检测精确配准关键算法

为了实现快速印制电路板（PCB）钻孔自动检测,提出了一种PCB待测板和标准板快速自动配置算法。介绍了PCB钻孔自动光学检测系统的基本结构。采用粗匹配和精匹配两步进行配准的方法,通过边缘提取和Hough变换得到待测板4个角点坐标,利用角点坐标和标准板角点的关系进行粗配准,并找到待测板的定位孔;然后利用待测板定位孔圆心和标准板定位孔圆心的关系进行精确配准。实验证明,该算法计算速度和精度完全能够满足实际要求。

Key Arithmetic of Image Accurate Registration for Automatic PCB Drill Photoelectric Inspection

In order to realize the fast automatic PCB drill inspection, a fast arithmetic of image registration between standard PCB and testing PCB is proposed. The basic process of the image algorithm and the system structure are introduced. The process of registration is mainly consisted of approximate registration and accurate registration. Edge extraction and Hough transformation are used to obtain 4 corners coordinate of PCB firstly; the coordinates of location hole of the testing PCB can be obtained after approximate registration; the coordinates of circle center of location hole between the testing PCB and standard PCB are used to process accurate registration. Experience shows the method greatly improved the accuracy of image registration. The speed of the arithmetic also meets the needs of the real time process.