基于SIFT算法的PCB板基准点匹配  

PCB board reference point match base on SIFT algorithm

作　　者：潘长开[1] 田学军[2] 叶峰[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640 [2]湛江师范学院基础教育学院,广东湛江524300

出　　处：《现代电子技术》2012年第12期84-86,共3页Modern Electronics Technique

基　　金：国家863计划资助项目(2009AA04Z111);广东省教育部产学研结合基金资助项目(2010B090400531);广东省工业攻关基金资助项目(2009B010900017)

摘　　要：当PCB板上载到夹具过程中,由于夹具精度,人为等因素的影响,对基板坐标产生一定偏移及旋转的影响,从而对元器件装贴精度产生影响,因此对基准点进行特征提取,但具有比较大的局限性。由此提出一种基于尺度空间的SIFT算法的Mark点匹配方法,将图像上特征转化为尺度空间特征,可以只对一个Mark点进行匹配校正,消除电路板平面上平移误差和旋转误差,通过实验证明其精度能达到0.6个像素以下的亚像素级别的精度要求。In the SMT industry, when electronic components are placed by SMT machine automatically on PCB boards and the PCB boards are clamped to the fixture by man, the coordinate of the PCB board may produce a certain offset and rotation error, which may affect the placement accuracy of the components due to fixture accuracy and man-made factors. The general solution to eliminate the errors is feature extraction of the reference point, but it has a great limitation. The Mark matching method base on SIFT algorithm is proposed. This method changes the image characteristics into scale space features and can do matching correction for only one Mark point. It can eliminat translational errors and rotation errors on the circuit board plane. The experiments prove its accuracy can meet the accuracy requirements of suh-pixel which is less than 0.6 pixel.

关 键 词：SIFT算法 基准点 匹配 平移误差 

分 类 号：TN919-34[电子电信—通信与信息系统]