Machine vision lighting systems maximize the characteristics of the object under test and reduce the effects of contrast in the corresponding background, allowing high-speed cameras to clearly “see†the object under test. High contrast images can reduce system difficulty and improve system stability; conversely, low contrast images increase system processing time and increase system complexity. A large part of the success of machine vision applications depends on the lighting settings, and a suitable lighting system can make the entire vision inspection system more efficient and accurate. The following points will detail the machine vision lighting:
Light field illumination technology is suitable for detecting objects with a smooth surface. When the surface texture of the object is smooth, the illumination will produce specular reflection on the surface of the object to be measured. The intense reflected light is directly received by the high-speed camera, and a bright area appears in the field of view. When the surface of the object is missing, there is a rough texture, and the scattered light Keep away from high-speed cameras, dark areas appear in the field of view.
Figure 1: Good workpiece: a high-speed camera captures the complete annular area; missing artifacts: the exact part presents a dark area
Second: use the appropriate wavelength for precise positioningA light source of the appropriate color illuminates the board, allowing specific board components to reflect bright light, while erroneously mounted components absorb light and appear dark. Machine vision systems can quickly identify these errors. In this application, coaxial illumination technology and blue light source are used. The blue wavelength (460 nm) clearly distinguishes between silver and copper surfaces: copper absorbs blue light, dark colors appear, silver reflects blue light, and bright colors appear.
Figure 2: Blue light waves at 460 nm distinguish copper and silver surfaces
Three: use non-scattering illumination to detect glass cracksNon-scattering array illumination can be used to highlight defects on transparent glass. In this application, the non-scattering dark field illumination can highlight the characteristics of the object under dark background, making the crack appear bright. Light illuminates the clear glass in the dark field outside the field of view of the high speed camera. Most of the light penetrates the transparent glass and is not noticeable by high-speed cameras. When there are hollow cracks on the glass surface, the light refracts, reflects, and scatters in many directions, so that some of the light is captured by the high-speed camera. When the illumination light is scattered light, it is difficult to make the crack appear bright.
Figure 3: Non-scattering dark field illumination detects glass surface cracks
Four: use transparent light to check the transparent packagingDeletion, damage or inaccuracy in the plastic packaging of tablets is an important step in checking the quality of finished products. Illuminating plastic packaging that wraps pills is often a tough challenge. In this application, white LED lights are used for daylight illumination (CDI: Cloudy Day Illumina TIon). This cloudy lighting method enables the plastic packaging film of the drug to exhibit a transparent color, and the drug therein exhibits a high contrast neutral color.
This continuous diffuse lighting technology emphasizes surface texture and height variations. This illumination provides an oversized solid angle that allows light to be illuminated from multiple angles to the object under test, eliminating reflections and shadows from typical unidirectional or single-plane sources.
Figure 4: Check the transparent package with a diffused light source
Five: use color to create contrastZGAR TWISTER Disposable
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