Phytec FireWire-CAM-011H, Руководство пользователя

Страница: 67 / 87

The Camera in Detail
© PHYTEC Messtechnik GmbH 2006 L-680e_1
61
•
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 position 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 457
).
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 47: Light-Field- (Left) and Dark-Field-Lighting (Right)