The function of visual light source:

1. Illuminate the target and increase its brightness;

2. Forming imaging effects that are conducive to image processing;

3. Overcoming interference from ambient light to ensure image stability;

4. Used as a tool or reference for measurement.

Because there is no universal machine vision lighting equipment, it is necessary to design corresponding lighting devices for each specific application instance in order to achieve good results. This is also the value of machine vision system light sources.

The quality of the image, that is, whether the edges of the image are sharp, specifically:

1. Increase the difference in grayscale values between the part of interest and other parts;

2. Try to blank out the uninteresting parts as much as possible;

3. Improving signal-to-noise ratio is beneficial for image processing;

4. Reduce the impact of materials and irradiation angles on imaging.

LED light sources are commonly used and have the following characteristics:

1. It can be made into various shapes, sizes, and irradiation angles;

2. It can be made into various colors according to needs, and the brightness can be adjusted at any time;

3. Through this heat dissipation device, the heat dissipation effect is better and the brightness is more stable;

4. Long service life;

5. Fast response, able to achieve high brightness in 10 microseconds or less;

6. The power supply has an external trigger that can be controlled by a computer, with fast startup speed and can be used as an advantage; LEDs with low operating costs and long service life will show greater advantages in terms of comprehensive cost-effectiveness;

7. Special designs can be made according to customer needs.

By designing appropriate visual light sources and separating the target information and background information in the image, the difficulty of image processing algorithm segmentation and recognition can be greatly reduced, the positioning and measurement accuracy of the system can be improved, and the reliability and comprehensive performance of the system can be improved. On the contrary, if the visual light source is not designed properly, it will result in twice the effort in designing image processing algorithms and imaging systems. So the success or failure of visual light source and optical system design is an important factor determining the success or failure of the system.