Research of repeatable positioning accuracy of automatic optical inspection

It is very important that the beginning positioning in the inspection of PCB board in automated optical inspection. The accuracy of the original position influence the later checking result of the components in the PCB board, it is crucial to do research the positioning accuracy repeatedly. There are many factors affect the position accuracy. Which including different checking algorithm, the outside environment such as temperature, humidity, brightness and the size of PCB board. This article is mainly focus on the repeatedly process and results of positioning accuracy in two different algorithm between color segmentation algorithm and template matching algorithm, and then analyzing and discussing on these result.