Application of image processing in the detection of printed circuit board

It is inevitable that there will appear defections such as the appearance's not neat, solder mask's unevenness, lines' and pads' damages in the production of printed circuit board. In this paper an image acquisition system of the circuit board is designed. Digital image processing technology has been carried on the analysis of the collected image. In image preprocessing, these processing methods as image enhancement, edge detection, the two value processing method have been used to improve the image quality. In the extraction and recognition of the defection, subtraction method is used to perform the detection of the defect board through the comparison and matching of the defect image and the template image.