The so-called machine vision is to use the machine instead of the human eye to make measurements and judgments. Machine vision system refers to the conversion of the ingested target into an image signal by a machine vision product, which is transmitted to a dedicated image processing system, and converted into a digitized signal according to pixel distribution and brightness, color and the like; the image system performs various operations on these signals. To extract the characteristics of the target, and then to control the device action on the scene according to the result of the discrimination.
Why use a machine vision system?
There are five main reasons for using machine vision systems in industrial automation control:
Accuracy - Due to the physical limitations of the human eye, the machine has obvious advantages in terms of accuracy. Even if the human eye relies on a magnifying glass or microscope to detect the product, the machine will still be more accurate because it can achieve an accuracy of one thousandth of an inch.
Repeatability - The machine can perform the inspection work again and again in the same way without feeling tired. In contrast, the human eye will have subtle differences each time the product is tested, even if the product is identical.
Speed ​​- the machine is able to detect products faster. Especially when detecting high-speed moving objects, such as production lines, machines can increase production efficiency.
Objectivity - There is also a fatal flaw in human eye detection, which is the subjectivity of emotions. The test results will change with the mood of the workers, and the machine has no emotions, and the results of the tests are naturally very reliable.
Cost – Since the machine is faster than a person, an automatic inspection machine can take on the tasks of several people. Moreover, the machine does not need to be stopped, does not get sick, and can work continuously, so it can greatly improve production efficiency.
Because machine vision systems can quickly acquire a large amount of information, and are easy to automate, and easy to integrate with design information and processing control information, in modern automated production processes, machine vision systems are widely used for condition monitoring and finished product inspection. And areas such as quality control. Machine vision systems are characterized by increased flexibility and automation. In some dangerous working environments that are not suitable for manual work or where artificial vision is difficult to meet the requirements, machine vision is often used instead of artificial vision. At the same time, in high-volume industrial production process, manual visual inspection is used to check product quality with low efficiency and low precision. Machine vision inspection methods can greatly improve production efficiency and automation of production. Moreover, machine vision is easy to realize information integration, and is the basic technology to realize computer integrated manufacturing.
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