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The role of industrial computer in machine vision

Since the 21st century, as people's quality of life has continued to increase, the diverse demands for daily necessities, transportation, clothing, housing, etc. have also continued to change and grow. This has a great impact on factory design, product update iterations, and factory productivity. There is a huge test, let more factories consider intelligent equipment manufacturing, let factories move towards automation, industry 4.0, the road of future factories, in the fiercely competitive international market, low cost and high quality are the key to determine the life of products. How to improve product quality, how to achieve zero-defect products and other topics are gradually being more and more widely concerned. For various products, the method of ensuring quality is also different. Let's discuss the application of machine vision technology in this respect.

First introduce what is machine vision
Machine vision is a comprehensive technology, including image processing, mechanical engineering technology, control, electric light source lighting, optical imaging, sensors, analog and digital video technology, computer software and hardware technology (image enhancement and analysis algorithms, image cards, I/O card, etc.). A typical machine vision application system includes image capture, light source system, image digitization module, digital image processing module, intelligent judgment decision-making module and mechanical control execution module.

Machine vision is the eye of industrial automation. The performance of the industrial computer affects the processing speed and running time of the entire vision system, which is the key to the entire vision system. Especially for vision systems that need to control multiple cameras to run simultaneously, high-reliability and high-stability industrial computer storage devices are indispensable.

The working principle of machine vision is very simple. It is very similar to a single-function industrial robot. It uses a camera to capture the image of the detected object, and the special light source makes the characteristics of the detected object strengthened in the image, such as size features, surface defect features, etc. . These images with clear features are transmitted to the industrial computer at high speed to calculate the characteristics through specialized image analysis and processing software. According to the calculation results, the industrial computer can control the actuator to perform actions such as classification, elimination, and alarm. If compared with human beings, cameras are like human eyes, industrial computer is like human brain, software is like human thinking, and actuators are like human hands and feet. In fact, the machine vision system is like a person who thinks fast, moves quickly, and is tireless. Compared with humans, it has the following advantages:
Fast speed: It can fully inspect the surface of the steel strip moving at 1000m per minute with an accuracy of 0.1mm, and can also precisely measure the dimensions of complex parts at a speed of thousands per minute.
Stable quality: The biggest disadvantage of manual inspection is that the quality is not stable, but the industrial computer does not. The industrial computer has the characteristics of reliability and stability. The machine vision can work 24 hours a day according to the set task, and ensure that there is no omission in product inspection.
Not restricted by the environment: Human beings cannot work in environments such as high temperature and narrow space in industrial production, but machine vision is not restricted.
High precision: For the quality inspection of very small electronic components, connectors, etc., workers often need to use microscopes and other means, and the efficiency is low, while machine vision can quickly measure any small size with the help of high-magnification lenses.
In recent years, industrial computer technology has developed rapidly. Relying on the strong support of industrial computer, machine vision technology has been more and more applied to the online inspection of industrial production, so as to realize the rapid and full inspection of product quality, and then realize the product quality. of zero defects. At present, machine vision is mainly used in surface quality inspection, dimension measurement, target positioning, target recognition, target comparison, etc. The fields involved include steel, non-ferrous metals, plastics, glass, textiles, papermaking, electronics, and the manufacturing of precision spare parts.

Industry 4.0 cannot be separated from intelligent manufacturing, and intelligent manufacturing cannot be separated from machine vision. Against the backdrop of rapidly rising labor costs and rapidly changing manufacturing application requirements, machine vision, as a window of industrial automation, can effectively save manufacturing costs and improve work efficiency, which is inseparable from the guarantee of the following technical features.

1. Intelligent identification, the fast-paced development of the manufacturing industry, machine vision needs to have the ability to acquire massive information, in order to find the key from a large amount of information to achieve intelligent sorting and precise measurement, accuracy and reliability are the key;
2. Intelligent detection, in view of the rapid increase in the writing of complex application programs and computer algorithm functions of various testing instruments, on the basis of measurement, it is necessary for the relevant visual measurement system to have the logical judgment ability of multi-information and multi-task comprehensive analysis and processing;
3. Intelligent interconnection, based on the rapid development of the Internet of Things, Industry 4.0 is about to realize the multi-node collection and interconnection of massive data of machine vision. By associating management and control personnel, machinery and equipment, production materials, etc., innovative capabilities such as intelligent prediction and intelligent optimization are derived. , to make efforts for intelligent manufacturing.

Machine vision technology plays an important role in the development of industrial automation. With the transformation and upgrading of manufacturing intelligence, the application of related embedded machine vision systems in various automation equipment will be more flexible.

How to choose a visual industrial computer?
There are three main types of industrial computers with different product architectures currently on the market. One is a combination of general-purpose 4U industrial computer with multi-network port network card; the other is a dedicated embedded machine vision host based on ARM architecture; the other is an X86 embedded machine vision host with high performance and low power consumption. These three types of industrial computers have their own advantages and disadvantages in actual industrial applications, but they all have one thing in common, that is, they all need to integrate multiple network ports or multiple USB ports, or a number of digital I/O ports. Various interfaces to be added.

The selection of industrial computer should pay attention to the following aspects:
1. Size of industrial computer
Determine the size of the industrial computer Due to the limitation of machine space, the size of the industrial computer will be limited. According to the installation size of the industrial computer, the height varies from 1U to 7U. There are also smaller, fanless industrial computers and embedded industrial computers, which are only a dozen centimeters long, and the workstations are more complicated. First, select the product specifications according to the size of the on-site installation.

2. Installation method of industrial computer
According to the actual installation method, industrial computers can be divided into wall-mounted, rack-mounted, desktop all-in-one and embedded. The industrial computer can be selected according to the application regulations and considering the wiring mode, such as preventing wiring problems such as front wiring and rear wiring.

3. Computer host configuration for industrial production
The core of industrial computer equipment includes CPU, memory, running memory, mobile phone software and so on. According to the size of the industrial computer and the natural installation environment, select the CPU to ensure the smooth operation of the industrial computer. Clearly give the main purpose of the memory space. Some vision systems must store the image each time. If they continue to run every day, it will cause a very large running memory image. In addition, in order to better speed up the response and reduce the voltage transformer, it is necessary to consider using a solid-state drive instead of a solid-state drive.

4. Industrial computer socket
Specify the total number and connection method of surveillance cameras and light source control boards in the vision system. If the system has 8 cameras and needs to operate 4 light sources, the cameras are connected by network cables, and the light control board has 232 ports, then the number of network ports and the number of serial ports can be cleared by the industrial computer.

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