Engineering KnowledgeEnglish日本語 |
->

Photoelectric Sensors Laser
Sensors		 Pressure Sensors Safety
Curtain		 Displacement Sensors Optical Micrometers Digital Microscopes Laser Markers PLC
Units		 Barcode Readers
 
Ask the ExpertExpert Price InfoPrice Trial UnitUnit Catalog DownloadCatalog
Your guide to Machine Vision
Guide Topics
Machine Vision
System parts
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
KEYENCE General Catalog

Keyence Product Information Site
KEYENCE Machine Vision product information

Technical Glossary

World Standards Information
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


More on this topic...
-> A Desktop Reference for Sensors, Vision Systems and Measuring Instruments. General Catalog
-> Machine Vision Academy Vol.7 Machine Vision Academy Vol.7
Visual Inspection Guide Collection Visual Inspection Guide Collection
Click here to ask our Machine Vision experts a support question.
Need price information? Click Here
For information on a trial unit click here.

Page Top
Copyright(c) 2007 KEYENCE CORPORATION. All rights reserved. | Privacy | Terms of Use | Contact | Produced by Produced by Keyence