Light source is positioned on opposite side of camera and workpiece.
Brightfield
By means of a diffusor between light source and workpiece a high contrast image of the shape of the workpiece will be created.
Advantages:
Sharp silhouette of workpiece for edge detection (dimensioning)
Even illumination background for transparent and opaque workpieces
Disadvantages:
Surface structure not visible
How to realize:
LED Backlight
Fiber Optic Backlight
Transmitted Light Stage
Darfield
Improves contrast of transparent workpieces. Low angle illumination makes the edges appear bright against dark background.
How to realize:
Linelight
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