What do I need to pay attention to when buying a machine vision LED lighting source?

When purchasing machine vision LED lighting sources, in addition to the premise that product quality is guaranteed, procurement also needs to identify professional suppliers. So, how to choose a machine vision LED lighting source? The following Xinxiwang will take you to understand:

1. Brightness:

When choosing between two light sources, the best choice is the brighter one. When the light source is not bright enough, there are three undesirable situations that can occur. First, the camera's signal-to-noise ratio is insufficient. Due to the insufficient brightness of the light source, the contrast of the image is necessarily insufficient, and the likelihood of noise in the image immediately increases. Secondly, the brightness of the light source is insufficient, and the aperture must be increased to reduce the depth of field. Third, when the brightness of the light source is insufficient, random light such as natural light will have a big impact on the system.

2. Uniformity of light source:

Uneven light can lead to uneven reflections. There are three aspects involved. First of all, for the field of view, the field of view of the camera should be uniform. In short, the dark areas in an image are the places where the reflected light is lacking, and the bright spots are the places where the reflections are too strong. Second, uneven light can produce more light in some areas of the field of view than others. As a result, the reflection of the surface of the object is uneven (assuming that the light reflection of the surface of the object is the same). Thirdly, a homogeneous light source will compensate for changes in the angle of the object's surface. Even if the geometry of the surface of the object is different, the reflection of the light source in each part is uniform.

3. Spectral characteristics:

The color of the light source and the color of the surface of the measuring object determine the magnitude and wavelength of the light energy reflected to the camera. White light or special spectra can be important factors when extracting the characteristic information of other colors. When analyzing polychromatic properties, color temperature is a more important factor when choosing a light source.

4. Life characteristics:

Light sources generally need to be used continuously. In order to maintain consistent and accurate image processing, vision systems must ensure stable and consistent images over a long period of time.

5. Contrast ratio:

Contrast is very important for machine vision. An important task of lighting in machine vision applications is to maximize the contrast between the features that need to be observed and the image features that need to be ignored, making it easy to distinguish between features. Contrast is defined as a sufficient grayscale difference between a feature and the area around it. Good lighting should ensure that the features that need to be inspected stand out from the rest.

Chengdu Xinxiwang Technology Co., Ltd. specializes in the sales of ring light source, bar light source, surface light source, line light source, ultraviolet light source, parallel light source, UV light source, point light source, vision system, industrial camera, industrial lens and other products, many years of professional experience, serving dozens of well-known customers, welcome to consult!