Machine vision is to use machines instead of human eyes do measure and judge.
The machine vision system means through machine vision products will be converted into an image signal pickup target, transfer to a dedicated image processing system, according to the distribution of pixels and brightness, color and other information into a digitized signal; image system for various operations on these signals to extract target features, and thus to control the action of equipment depending on the identified results.
The use of machine vision systems have the following five main reasons:
Accuracy - because the human eye physical constraints on the accuracy of the machine has obvious advantages. Even if the human eye depends on the magnifying glass or a microscope to detect the products, the machine will still be more precise, because of its precision can be achieved thousandth of an inch.
Reproducibility - machine testing work can be completed in the same way again and again and not feel tired. In contrast, the human eye each detection products will be slightly different, even if the product is identical.
Speed - the machine faster detection products. Especially when high-speed moving objects detected, for example, the production line, the machine can be improved production efficiency.
Objectivity - the human eye to detect there is a fatal flaw, is the emotional subjectivity, the test results will be good or bad with the workers' mood changes, and the machine does not have emotions, naturally very impressive and reliable test results.
Cost - the machine faster than a human, an automatic inspection machine able to assume the tasks of several people. And the machine does not need to pause, do not get sick, be able to work continuously, it can greatly improve production efficiency.
Machine vision system can quickly obtain a large amount of information, and easy, but also easy with the design information and process control information integration, modern automated production process, machine vision systems are widely used in working condition monitoring, product testing and quality control and other fields. The machine vision system is to improve the flexibility and degree of automation of the production. Difficult to meet the requirements of the occasion in a dangerous work environment is not suitable for manual operation or artificial vision, commonly used in machine vision to replace artificial vision; doing so visually check the efficiency of product quality at the same time in large volume industrial production process with low accuracy is not high. machine vision detection method can greatly improve production efficiency and the degree of automation. And machine vision easy to implement information integration is the basis of computer integrated manufacturing technology.
