A fast detecting algorithm for surface mount devices based on complex moment

In electronic manufacturing process, Surface Mount Devices, such as Ball Grid Array or Quad Flat Package, are difficult to locate precisely because of image noise. To improve the detecting accuracy, this paper analyzed the difficulties of detecting SMDs and then proposed a new fast detecting algorithm based on complex moment, which utilizes moment invariance to determine the position and angle of Surface Mount Devices and eliminate the locating uncertainty from local noise. The experiments demonstrated that the proposed algorithm can detect Surface Mount Devices´ position and angle efficiently and is more reliable than the algorithm based on edge detecting.