The main components of the machine vision system

From the literal meaning of the machine vision system can be seen to be divided into three parts: machine, vision and system. The machine is responsible for the movement and control of the machine; the vision is realized through the lighting source, industrial lens, industrial camera, and image acquisition card; the system mainly refers to the software, and can also be understood as a set of machine vision equipment. Here we focus on the five major modules in the machine vision system:

1 machine vision light source (ie lighting source)

Illumination light source is an important part of the machine vision system input, its quality directly affects the quality of the input data and the application effect. Since there is no universal machine vision lighting device, the corresponding visual light source is selected for each specific application example to achieve the best results. Common light sources include: LED ring light sources, low angle light sources, backlight sources, bar light sources, coaxial light sources, cold light sources, point light sources, linear light sources, and parallel light sources.

Industrial lens

The lens is responsible for beam modulation in the machine vision system and completes the signal transmission. Lens types include: standard, telecentric, wide-angle, close-up, and telephoto. The selection basis is generally based on the camera interface, subject distance, shooting range, CCD size, distortion allowable range, magnification, focal length, and aperture.

3. Industrial Camera

The most essential function of industrial cameras in machine vision systems is to convert light signals into electrical signals. Compared with ordinary cameras, it has higher transmission force, anti-interference force and stable imaging capability. According to different standards can have a variety of classification: According to the output signal, can be divided into analog industrial cameras and digital industrial cameras; according to different types of chips, can be divided CCD industrial cameras and CMOS industrial cameras, this classification is the most common.

4. Image capture card

Although the image acquisition card is only a component of a complete machine vision system, it is also very important and directly determines the camera's interface: black and white, color, analog, digital and so on. Typical examples are PCI acquisition cards, 1394 capture cards, VGA capture cards, and GigE Gigabit Ethernet capture cards. Some of these capture cards have built-in multiplexers that can connect multiple cameras and capture multiple messages at the same time.

5. Machine Vision Software

Machine vision software is a key component of the automation process in the machine vision system. According to the specific application requirements, secondary development of the software package can automatically complete the image acquisition, display, storage and processing. In the purchase of machine vision software, we must pay attention to the development of the hardware environment, the development of operating systems, language development, etc., to ensure that the software is stable and convenient for secondary development.