A complete set of visual inspection system mainly includes image acquisition part and image analysis part. The image acquisition part mainly includes industrial camera, industrial lens and machine vision light source. Today, we mainly introduce the relevant basic knowledge and selection skills of machine vision light source. First, we need to understand the role of light sources in machine vision:

1. Illuminate the target and improve the brightness;

2.Form an imaging effect conducive to image processing, reduce the complexity of the system and the requirements for image processing algorithms;

3.Overcome the interference of ambient light, ensure the image stability, and improve the accuracy and efficiency of the system;

Through proper light source lighting design, the target information and background information in the image can be optimally separated, which not only greatly reduces the algorithm difficulty of image processing, but also improves the accuracy and reliability of the system. At present, for each specific case, it is necessary to design an appropriate lighting device to achieve the best effect, while inappropriate lighting will cause many problems. Machine vision light source is so important, But it is often ignored by many people.

At present, LED (light emitting diode) is mainly used as machine vision light source. It is widely used in the industry because of its high degree of freedom of shape, long service life, fast response, good monochromaticity, various colors and high comprehensive cost performance:

1、 Shape degree of freedom

An LED light source is composed of many single LEDs. Therefore, compared with other light sources, it can be made into more shapes, and it is easier to design the shape and size of the light source according to the situation of users.

2、 Long service life

In order for the image processing unit to obtain accurate and reproducible measurement results, the lighting system must ensure that it can provide stable image input for a long time. The brightness of LED light source decreases after 10000 to 30000 hours of continuous operation, but the effect is much better than that of other types of light sources. In addition, by using the control system to make it work intermittently, the heating of the light-emitting tube can be restrained and the service life will be doubled.

3、 Fast response

The response time of LED light-emitting tube is very short. The real meaning of response time is to ensure the work switching between multiple light sources or between different areas of a light source as required. When a special controller is used to power the LED light source, the time to reach the maximum illumination is less than 10s.

4、 Various colors

In addition to the shape of the light source, another aspect of obtaining stable image input is to select the color of the light source. Even for light sources of the same shape, the images will be very different due to different colors. In fact, how to get the best contrast image effect by using the technical characteristics of light source color has always been the main direction of light source development.

5、 Low comprehensive operation cost

Choose products with low cost and no guarantee of performance, and the savings of initial investment will soon be offset by daily maintenance and repair costs. Other light sources not only consume 2-10 times more power than LED light sources, but also need to be replaced almost every month, wasting a lot of valuable time of maintenance engineers. Moreover, the more light sources put into use, the greater the cost of device replacement and labor. Therefore, it is very economical to choose LED light sources with long service life in the long run.

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