Vision system is to use machines instead of human eyes to measure and judge. Vision system refers to that through machine vision, the product (i.e.image pickup device, divided into CMOS and CCD) converts the captured target into image signal and transmits it to the special image processing system, which is transformed into digital signal according to pixel distribution, brightness, color another information; The image system performs various operations on these signals to extract the characteristics of the target, and then controls the equipment action on the scene according to the discrimination results.