With the advantages of speed, accuracy and repeatability, machine vision detection system is good at quantitative measurement of structured scenes. It can easily check the details of objects that are too small for human eyes to see. It can also prevent the clean room from being polluted by human beings and protect workers from the threat of dangerous environment.
In modern industrial automation production, machine vision inspection system involves a variety of inspection, measurement and parts identification applications, such as automobile parts size detection, automatic assembly integrity detection, electronic assembly line automatic parts positioning, beverage bottle cap printing quality inspection, product packaging bar code and character recognition, etc. The common characteristics of such applications are continuous mass production and high requirements for appearance quality.
Usually, this kind of highly repetitive and intelligent work is completed by the naked eye, but in some special cases, such as accurate and rapid measurement of micro size, shape matching and color recognition, the naked eye can not continuously and stably carry out, and it is difficult to implement with other physical quantity sensors.
With the aggravation of industry competition, the company does not even allow 0.1% defects in product quality control. Therefore, it is necessary to ensure 100% inspection pass rate (i.e. "zero defect") to ensure the continuous and stable growth of performance.
CCD camera is used to capture the image and send it to the computer or special image processing module. Through digital processing, the size, shape and color can be determined according to the pixel distribution, brightness and color.
This method combines the rapidity and repeatability of computer processing with the highly intelligent and abstract ability of human vision, thus producing the concept of machine vision detection technology.
Machine vision detection technology is a new detection technology based on computer vision research. Different from the research of computer vision, vision inspection technology focuses on the measurement of geometric shape and position of objects, such as the measurement of three-dimensional dimensions of automobile body. Measure coaxiality and coplanarity of large workpiece.
In addition, the detection system of machine vision inspection system technology can also automatically detect the whole product, which is also very important to control the product quality and ensure the product quality.