Real time PCB diagnosis using FPGA - implemented video analysis tool

This paper presents a solution to diagnosis printed circuit boards in terms of wiring crossing, based on real-time image analysis. The image is captured using an ordinary video camera (web cam) that is placed above the board while a light source is placed under. The image is processed locally in the FPGA, and bright spots which indicate board cross are isolated. Through an Ethernet interface, the system allows the input “pattern” (correct PCB cross positions) to be compared to the processed image. The comparison can determine the exact position of the cross points and if it corresponds to the expected pattern. The system is meant to be an effective method of real time checking of the printed circuit boards´ quality. For this paper we use the SoC circuit Zynq 7000 (XC7Z010).