Machine vision is a comprehensive skill, which is mainly composed of industrial cameras, light sources, industrial computers and corresponding picture analysis software systems. Machine vision is like a single-function industrial robot, such as using a camera to obtain a picture of the detected object, and a special light source makes the characteristics of the detected policy be strengthened in the picture, such as scale features, appearance defect features, etc. The picture with clear characteristics is transmitted to the industrial computer at high speed, and the characteristics are calculated by professional picture analysis and processing software, and the industrial computer can control the actuator to classify, reject, alarm and other actions according to the calculation results. Therefore, the performance of the industrial computer directly affects the processing speed and operation time of the entire machine vision system, and is the key point of the entire machine vision system
So how to choose an industrial computer for machine vision? The selection of industrial computers should pay attention to the following points:
1. Confirm the scale of the industrial computer
The space of automation equipment is limited, and the scale of the industrial computer should be selected according to the size of the space of the on-site device.
2. Confirm the device method of the industrial computer
According to the feasible device method on site, the industrial computer can be divided into wall-mounted, rack-mounted, desktop and embedded, and the wiring method should be considered together to avoid wiring difficulties such as front wiring and rear wiring.
3. Confirm the equipment of the industrial computer
Industrial computer equipment mainly includes processor, memory, storage, interface, etc. According to the size of the industrial computer and the device environment, select the processor to ensure the stable operation of the industrial computer. Determine the memory size according to the given usage, some vision systems need to store pictures every time, and if they run continuously every day, a large memory image will be generated. Together, in order to speed up processing and reduce current transformers, it is necessary to consider replacing HDDs with SSDs. Confirm the interface of the industrial computer according to the number of cameras, light source manipulator and connection method in the machine vision system. For example, if the system has 8 cameras and 4 light source demand control, the cameras are connected through the network cable, and the light source controller is RS232 interface, so that the number of network interfaces and serial ports of the industrial computer can be confirmed.
In recent years, the industrial computer industry has developed rapidly, relying on the strong support of industrial computers, machine vision skills are more and more applied to the online inspection of industrial production, to complete the rapid full inspection of product quality without loss, so as to complete the zero defect of product quality. At present, machine vision is mainly used in appearance quality inspection, scale measurement, policy positioning, policy identification, policy comparison, etc. The scope of involvement includes the production of steel, non-ferrous metals, plastics, glass, textiles, papermaking, electronics, and fine spare parts.
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