The main working process of a complete machine vision system is as follows:
1. The workpiece positioning detector detects that the object has moved to the center of the field of view close to the camera system, and sends a trigger pulse to the image acquisition part.
2. The image acquisition part sends a starting pulse to the camera and the lighting system respectively according to the pre-set program and delay.
3. The camera stops scanning and restarts a new frame scan, or the camera is in a waiting state before the start pulse arrives, and starts a frame of scanning after the start pulse arrives.
4. Turn on the exposure mechanism before the camera starts a new frame scanning, and the exposure time can be set in advance.
5. Another start pulse turns on the lighting, and the opening time of the light should match the exposure time of the camera.
6. After the camera is exposed, the scanning and output of a frame of image will officially begin.
7. The image acquisition part receives the analog video signal and digitizes it through A/D, or directly receives the digital video data after the camera digitization.
8. The image acquisition part stores the digital image in the memory of the processor or computer.
9. The processor processes, analyzes, and identifies the image to obtain the measurement results or logic control values.
10. The processing results control the action of the assembly line, carry out 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 objects monitored by the system are moving objects, the matching and coordination of the system and the moving objects are particularly important, so the action time and processing speed of each part of the system are strictly required. In some application areas, such as robotics and flying object guidance, there are strict requirements for the weight, volume and power consumption of the entire system or a part of the system.
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