Advanced Lighting
Creating a Good
Image
A
v4.1.3, April 2012 Visionscape FrontRunner™ User’s Manual A-11
Polarized Light
Polarized light helps reduce glare on an object when the glare interferes
with a visual inspection, such as when attempting to read a label.
To polarize light, place polarizing material over the light source, as shown
in Figure A–9. Another piece of polarizing material (an analyzer) is placed
in front of the camera lens and rotated until the glare, or mirror-like
reflection, is minimized.
FIGURE A–9. Polarized Light
For some applications glare may be helpful and you would not want to
eliminate it. For example, a hole in an object may be more easily seen on
a surface that has glare. In all cases, you will want to adjust the rotation of
the polarizing material to maximize the image contrast of the features you
wish to inspect.
Advanced Lighting
Microscan NERLITE is a recognized leading provider of lighting systems
designed specifically for machine vision applications. These products
allow machine vision systems to perform reliably in difficult imaging
applications involving highly reflective or uneven surfaces. NER is the
inventor of:
• DOAL™ — Diffused On-Axis Lighting. Refer to page A–12.
• CDI™ — Cloudy Day Illumination. Refer to page A–13.
Polarizer
Analyzer
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