In general, machine vision is to use machines instead of human eyes to do measurement and judgment. Firstly, a CCD camera is used to convert the target into an image signal, which is transmitted to a professional image processing system. According to the pixel distribution, brightness, color and other information, it is converted into a digital signal. The image system performs various operations on these signals to extract the features of the target, such as area, length, quantity, position, etc. Finally, output results based on preset tolerances and other conditions, such as: size, Angle, offset, number, pass/fail, yes/No, etc.

Machine vision is characterized by automation, objective, non-contact and high precision, compared with the image processing system in the general sense, machine vision emphasizes the accuracy and speed, as well as the reliability of the industrial field environment. Machine vision inspection equipment is suitable for the measurement, inspection and identification in the process of mass production, such as: parts assembly integrity, assembly dimensional accuracy, parts processing accuracy, position/Angle measurement, parts identification, characteristics/character recognition, etc.

Its largest application industries are: Automotive, pharmaceutical, Electronics & Electrical, Manufacturing, packaging/food/beverage, Medicine. As to examine the car dashboard machining accuracy, high speed SMT machine for rapid positioning of electronic components, to examine the pin number, surface printed character recognition of IC, capsule of capsule wall thickness and appearance defects in production of inspection, quantity of ball bearing production and damage of examination, face food packaging production date identification, inspection of labels put position. Industry experts predict: in the next 20 to 50 years, machine vision will become a universal technology across all industries, almost all products will be produced by the visual inspection system to detect.

In modern industrial automation production, it involves a variety of inspection, measurement and part identification applications, such as auto parts size inspection and automatic assembly integrity check, electronic assembly line components automatic positioning, beverage bottle cap printing quality check, product packaging bar code and character recognition. The common characteristics of such applications are continuous mass production and very high appearance quality requirements. Usually this is highly repeatability and intelligent work can only be done by manual inspection, we often see behind the modern assembly line in some factory hundreds or even more than thousand testing workers to perform this procedure, the increase for the factory huge artificial cost and management cost at the same time, still can't guarantee a 100% inspection qualified rate, and the competition between enterprises today, Even 0.1% defects are no longer allowed.

Sometimes, such as accurate and rapid measurement of small size, shape matching, color identification, etc., the human eye can not be carried out continuously and stably, and other physical quantity sensors are difficult to be used. At this time, people began to consider the speed of the computer, reliability, repeatability of the results, combined with the highly intelligent and abstract ability of human vision, resulting in the concept of machine vision.

Machine vision with the development of computer technology, fieldbus technology, technology is becoming more mature, is an indispensable equipment for modern processing and manufacturing industry, widely used in food and beverage, cosmetics, pharmaceuticals, building materials and chemical industry, metal processing, electronic manufacturing, packaging, automobile manufacturing and other industries. The introduction of visual inspection equipment, instead of the traditional manual detection method, greatly improve the quality of products on the market, improve the production efficiency. Also stepped up a new level for intelligent manufacturing in China.