Research on Geometric Positioning Algorithm of Vision System in High Speed and High Precision Chip Mounter

Abstract

Considering features of PCB marks and components image, in order to search a consistent location for reference images in multidimensional parameter space, the algorithm of geometric characteristic recognition location is proposed. Geometric location algorithm mainly include model training and real-time search. Compared to edge location and traditional localization methods, which not only adapt the gray-scale linearity and the gray non-linear changes, but also support changes in scale and perspective. Numerical results shows that the position deviation of geometric positioning algorithm is less than 0.5 pixel, the angle deviation is less than 0.5 degree. This algorithm is robust, simple, practical and it is better than the traditional location method.