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       Ground light sourceIt is one of the key parts of the machine vision system. The machine ground light source directly affects the image quality, thereby affecting the performance of the system. Its importance cannot be overemphasized. Good lighting design allows us to get good images, thereby improving the resolution of the entire system and simplifying software calculations, while inappropriate lighting will cause many problems.

Through the machineGround light sourceAppropriate lighting design and reasonable separation of target information and background information in the image can greatly reduce the algorithm difficulty of image processing and improve the accuracy and reliability of the system. On the contrary, if the ground light source is not properly designed, it will lead to the design of image processing algorithms and imaging systems with half the effort. So far, there is no universal machine vision lighting device, so it is necessary to design a suitable lighting device for each specific situation to achieve the desired effect. Therefore, the success or failure of the machine ground light source and optical system design is an important factor in determining the success or failure of the system. So what factors do we need to consider when choosing a machine ground light source?Ground light sourceThe following factors should be considered:

　　1. Life

The light source is used for detection. In order to make the image processing accurate and consistent, the vision system must work for a long time to obtain a stable and consistent image.

　　2. Contrast

Contrast is very important and necessary for machine vision. The important task of the machine light source is to produce a huge contrast between the characteristics of the measured object and the image that needs to be ignored, so that it is easier to distinguish the characteristics of the measured object.

The definition of contrast is that the characteristics of the measured object and its surrounding ignored image area have sufficient difference in gray value. A good light source is to ensure that the characteristics of the measured object stand out from other backgrounds.

　　3. Scope

The color of the light source and the surface color of the measured object determine the size and wavelength of the light energy reflected in the camera. or other spectra may be an important factor in extracting other color features. When analyzing multi-color features, the color temperature of the light source is an important factor.

　　4. Contrast

When two light sources are selected, the brighter one should be selected. When the light source is not bright enough, three situations may occur.

　　1) The camera signal-to-noise ratio is not enough. Because the brightness of the light source is not enough, the contrast of the image is bound to be insufficient, and the noise on the image will increase accordingly.

　　2) Insufficient brightness of the light source will increase the aperture, thereby reducing the depth of field.

　　3) When the brightness is not enough, random light such as natural light has a greater impact on the system.

　　5. Light source uniformity

Uneven ground light source will cause uneven reflection. And will involve the following three aspects:

1) For the field of view, it should be uniform within the field of view of the camera, that is, the dark areas in the image lack reflected light, and the bright spots will reflect too strongly.

2) Uneven light will cause some areas in the field of view to have more light than others. This results in uneven reflection from the surface of the object.

　　3) A uniform light source will compensate for changes in the angle of the surface of the object. Even if the surface shape of the object is different, the reflection of the light source at each part is uniform.