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MachineGround light sourceThe function of the machine ground light source is to separate the target information from the background information in the image, which can greatly reduce the difficulty of image processing algorithm segmentation and recognition, improve the accuracy of the system, and improve the reliability and comprehensive performance of the system.

　　Use the machineGround light sourceThe purpose is to make the image of the machine vision system analysis clear, and in order to get a clear image, you need to use different machine ground light sources and different lighting methods.

　　One-way lighting

A unidirectional illumination system formed by one or more point light sources may use lenses or mirrors to converge or diverge the light. It has the advantages of high brightness, flexibility, easy to adapt to packaging requirements, uniformity through a variety of light sources or suitable imaging systems, and can be applied to various occasions. The disadvantages are shadows and reflections, which are commonly used to check flat and textured surfaces.

In order to obtain the effect of straight-line light, the ground light source is illuminated from top to bottom, and the bottom and background are basically dark, only protruding the edges. This is the feature we need-straight lines.

　　grazing illumination

The ground light source is substantially parallel to the surface of the object, I .e. illuminates at a small angle. Advantages: display surface structure, enhance the contour of the object. Cons: Hot spots and extreme shadows. Available light sources: low-angle ring light, linear light, strip light, often used in the edge of the object contour, surface defects, etc. The following figure shows the illumination effect of grazing light illuminating a low-angle ring light source, which can highlight the surface defects and contour performance of the wafer when the wafer is illuminated.

　　diffuse reflection illumination

In a direct shotGround light sourceA layer of diffuser plate is added to the outside to spread the light emitted by the light source evenly. Advantages: small reflection, uniform light. Disadvantages: Insufficient directivity. Light source type: ring light, strip light, flat shadowless light, etc. Uses: large area, reflective, long working distance, high uniformity requirements of the object.

If there is no diffuser, you can see the glare effect in the highlighted part of the image, as well as the LED particle reflection points on the highly reflective metal surface. There is a diffuser light source, the highlight part has no glare, and the LED graininess obviously disappears.

　　coaxial light illumination

And the lens can see the object through the beam splitter. Advantages: uniform, no shadow, small reflection, strong directivity. Disadvantages: large size, difficult to make large-area light source, low efficiency, short working distance, mirror image coincides with actual object. Purpose: Surface inspection of flat reflective objects, such as discs, glass, etc. Backlight illumination

The back illumination is used to create a shadow of an opaque object or to view the interior of a transparent object. Advantages: The edges are particularly prominent. Disadvantages: No surface details can be observed. Light source type: surface light, side light, coaxial light, coaxial parallel light, etc. Uses: edge detection, size detection, etc. This illumination mode is different from other modes. It is a lighting mode with a bright light source as the background and a dark target as the characteristic.

　　structured light illumination

Light is cast on an illuminated object in a structure. Advantage: A more uniform illumination pattern can be obtained. Disadvantages: Whether it is a single light source or multiple light sources, the volume is very large. Available light sources: ceiling light, four-sided dimmable, four-sided shadowless light, combined light source. Purpose: Large-area objects that require uniform illumination, and objects that need to detect multiple features at the same time.