The advantages and working process of machine vision system are described briefly

With the development of technology, the application field of machine vision system is more and more extensive, and it can be said that it has penetrated into all aspects of our life, production and work. At the same time, its advantages are: 1, non-contact measurement, will not cause any damage to the observer and the observed, so as to improve the reliability of the system. 2, with a wide spectrum response range, such as the use of infrared measurement invisible to the human eye, to expand the visual range of the human eye. 3, long-term stable work, it is difficult for humans to observe the same object for a long time, and machine vision can be measured, analyzed and identified for a long time. Its main working process is as follows:

1. The workpiece positioning detector detects that the object has moved close to the center of the field of view of the camera system, and sends a trigger pulse to the image acquisition part.

2. The image acquisition part sends the starting pulse to the camera and lighting system respectively according to the preset procedure and delay.

3. The camera stops the current scan and starts a new frame scan, or the camera is in a waiting state before the start pulse arrives and starts a frame scan after the start pulse arrives.

4. Open the exposure mechanism before the camera starts a new frame scan, and the exposure time can be set in advance.

5. Another start pulse turns on the light lighting, and the turn on time of the light should match the exposure time of the camera.

6. After the camera is exposed, the scanning and output of an image is officially started.

7. The image acquisition part receives the analog video signal through A/D to digitize it, or directly receives the digital video data after the camera is digitized.

8. The image acquisition part stores digital images in the memory of the processor or computer.

9. The processor processes, analyzes and recognizes the image to obtain the measurement result or logical control value.

10. Processing results Control the action of the assembly line, conduct positioning, correct the error of the movement, etc.

As can be seen from the above workflow, machine vision is a relatively complex system. Because most of the system monitoring objects are moving objects, the matching and coordination of the system and moving objects is particularly important, so it brings strict requirements for the action time and processing speed of each part of the system. In some application areas, such as robotics, flying object guidance, etc., there are strict requirements for the weight, volume and power consumption of the entire system or a part of the system.