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Your guide to Machine Vision
Guide Topics
Machine Vision
System parts
Machine Vision Systems
Vision Techniques
Lighting Techniques
Major Illumination Types
Illumination Intensity
Illumination Basics
Specific Lighting Techniques
Polarizing Filters
Information About Lenses
Lens Basics
Lens Selection
Lens Characteristics
Image Processing Techniques
Major Image Processing Methods
Grayscale Edge Detection
Normalized Correlation Search
Binarization Stabilization Technique
Binarization Application Examples
Labeling
COUNT
Examples of Technique Application
Coated Glossy Surface, Engraved Mark Inspection
Detection of Scratches and Chips on a Low Contrast Surface
Detection of the Dimensions and Shape of Transparent Objects
Detection of Concave and Convex, Print on Curved Surface, and Contamination
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Machine Vision Systems
  

Polarizing Filter
A polarizing filter allows passage of certain light wave components. By attaching this filter in between the camera lens and light, direct reflections, such as those caused by gloss, can be eliminated as shown in the figure below.
Principle
  
Application
Light "1" is polarized in the direction of "2" by filter A. The light is reflected on the glass surface and the reflected light "3" is blocked by filter B. However, the light reflected on the object diffuses again (light "4") , part of which (light "5") enters the camera.   For poor prints inspection over the film, etc.
Set-up with polarizing filters
Detection of Defective Shrink Packaging of Batteries
Resulting images with and without polarizing filters
With polarizing filter Without polarizing filter


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