In machine vision system, the key technologies are light source illumination technique, industrial lens, video camera, image acquisition card, image processing card, fast and accurate actuator, etc.
Light sources play an important role in machine vision systems. The right machine vision light source becomes the key factor to determine the success of the whole system. The main purpose of the light source is to distinguish the measured object from the background as much as possible, so as to obtain high quality and high contrast images.
In machine vision application systems, good light sources and illumination schemes play a very important role in the success of the whole system. They do not just illuminate objects.
The coordination of light sources and illumination schemes should highlight the characteristic quantity of the object as much as possible. Machine vision 3D detection should increase the sharpness and contrast between the parts of the object that need to be detected and those that are not important. At the same time, it should ensure the sufficient overall brightness, and changes in object position should not affect the image quality.
Transmitted light and reflected light are commonly used in machine vision application systems. For reflected light, factors such as the relative position of the light source and the optical lens, the texture of the object surface, the geometry of the object, and the background should be fully considered. The choice of light source must conform to the required geometry, lighting brightness, uniformity, luminous spectral characteristics, etc. At the same time, the luminous efficiency and service life of light source should be took into account.
Optical lenses are equivalent to the lens of the human eyes, which are very important in machine vision systems. The image quality of a lens, that is, the image calibration effect of a lens, can be judged by the aberration size. The common aberrations are spherical aberration, coma, astigmatism, field curvature, aberration and chromatic aberration.
Machine vision is a technology that makes measurements and judgments with machines instead of human eyes. This technology has been successfully applied to the quality inspection of a lot of products in the world. Compared with artificial vision detection, machine vision has the advantages of high automation, strong recognition ability and high measurement accuracy, which has a wide application prospect.
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