Phytec FireWire-CAM-001, Руководство пользователя

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The Camera in Detail
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PHYTEC Messtechnik GmbH 2005 L-661d_1
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Light-Field or Dark-Field Lighting
These two methods differ from one another considerably in terms of
the camera position in relation to the object. The positon of the
lighting source in relation to the object remains the same.
The light field lighting leaves the ranges of interest dark (e.g. a drill
hole in a workpiece). The dark field lighting functions in the opposite
manner (Figure 40).
The type of lighting should be selected based on the object surface. If
necessary tests should be performed with both variants to determine
which method displays the structures of interest the best.
Figure 40: Light-Field- (Left) and Dark-Field-Lighting (Right)