基于势函数的印刷电路板定位孔快速定位算法  

Fast and Accurate Positioning Algorithm Based on the Potential Function for the Center of PCB Location Hole

作　　者：郭峰林[1] 管庶安[1] 何健[1] 

机构地区：[1]武汉工业学院计算机与信息工程系

出　　处：《科技导报》2010年第16期71-73,共3页Science & Technology Review

基　　金：湖北省自然科学基金项目(2004ABA033)

摘　　要：分析了Sobel算子检测印刷电路板（PCB）定位孔的缺陷,提出了一种基于势函数的定位孔快速精确定位算法。该算法对焊盘图像中亮斑干扰不敏感,对模糊成像的适应能力强,能有效纠正因蚀刻质量较差而引起的焊盘局部形状变形问题。模拟实验表明,该算法性能稳定、定位精度高、速度快,能较好地满足工程实时处理要求。It is shown in this paper that there are some defects in the Sobel operator to detect the location hole of Printed Circuit Board （PCB） and a fast and accurate positioning algorithm based on the potential function is proposed, which provides a two-step algorithm for the effective and accurate location of the pad hole center. （1） Coarse positioning of the radius and the center of the location hole through the region dividing and connected region searching method based on the smooth processing to the original image. （2） Setting up the potential function, which reflects the strength of the circle edge, then dynamically adjusting the offset of the radius and the center of the pad based on the circle parameter obtained in step （1）. When the value of the potential function reaches the maximum, the radius and the center of the pad is obtained. The algorithm is not sensitive to the interfering bright spots within the pad image, can be quite adaptable to the fuzzy pad image, and, at same time, can effectively correct the pad shape deformation due to the poor quality of the circuit board corrosion. Experiments show that the algorithm has a stable performance, a high positioning accuracy and a good efficiency, which can be better meet the engineering real-time requirements.

关 键 词：势函数 定位孔 粗定位 机器视觉 

分 类 号：TN41[电子电信—微电子学与固体电子学]