Vision inspection is the use of machines instead of the human eye to make measurements and judgments.

Visual inspection refers to the machine vision products (i.e. image acquisition device, divided into CMOS and CCD two kinds) will be taken into the target into the image signal, transmitted to the special image processing system, according to the pixel distribution and brightness, color and other information, into digital signals; image system on these signals to carry out a variety of operations to extract the characteristics of the target, and then according to the results of the judgment to control the field equipment action. It is used in the detection of defects and the prevention of defective products. It has inestimable value in the function of detecting defects and preventing defective products from being distributed to consumers, and has outstanding advantages such as non-contact, fast speed, good flexibility, etc., which has an important application prospect in the modern manufacturing industry.