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In the following we deal with the possible parameters of illumination and the different lighting techniques. They must be selected in such a way that a perfectly evaluable image is generated in combination with the material properties of the test object.
Types ofilluminationpdf
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Illumination lightingmeaning
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lente convergente di distanza focale pari a 16 cm. ▻ Calcola la distanza dell'immagine dalla lente. ▻ Verifica graficamente il risultato ottenuto. [0,44 m].
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Usually one of these effects never appears alone, but it is always a combination of several effects. Even a high-quality mirror reflects only about 95% of the incident light.
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Depending on the material surface, a large number of effects appear there. The incident light is partly absorbed and, depending on the material surface, parts of it are reflected and strayed. In case of opaque, semi-transparent or translucent materials, the light can penetrate through the body (transmission). In some cases, the light is even polarised or diffracted at the surface.
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Basic lens specifications are inscribed on interchangeable lenses. The numbers and letters provide the focal length, maximum aperture (f-stop setting), filter size, and other information related to the lens.
2020107 — Introduction · Field of view (FOV): Area under inspection that the camera needs to acquire · Smallest feature: The size of the smallest feature ...
Light beams can shine onto the object from above, at angles from one side or all around, shallowly or from the opposite side. Depending on the surface shape, material texture and structure, light is scattered, absorbed, reflected or transmitted on the object or it can cast a shadow. In addition to the direction of the illumination, it is very important whether the light is collimated and diffuse.
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The main task of lighting is to create contrast between the object features to be detected. A variety of parameters can determine the light source, which creates an interaction with the test object and its individual material properties.
For example, on the front of the SAL1870 lens the inscription reads: DT3.5-5.6/18-70 and 0.38m/1.3ft MACRO and Ø55. The DT prefix indicates that the lens is specifically designed for use with APS-C format digital SLR cameras. The 3.5-5.6 numbers indicate the maximum aperture (f-stop setting) possible at the shortest and longest focal lengths. The 18-70 indicates 18mm is the shortest focal length and 70mm is the longest focal length. The 0.38m/1.3ft designation indicates the minimum focusing distance of the lens in meters and feet. The Ø55 indicates the size (in millimeters) of filter you can attach to the lens.
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