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

Darkfield

Improves contrast of transparent workpieces. Low angle illumination makes the edges appear bright against dark background.

How to realize:

• Linelight