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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
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Coated Glossy Surface, Engraved Mark Inspection

Oblique Lighting Prevents Glare and Irradiates Long Workpieces Uniformly
Detection of Insufficient Coating on Terminal
Insufficient coating of terminal tip is detected. Through color processing, the silver color of the ground metal and gold color coating can be distinguished although it is almost impossible in the case of black and white processing.
Example of oblique lighting set-up  
In the case of simple reflected light
Image with direct lighting
Color difference is indistinct and the surface gloss results in uneven irradiation.
 
In the case of bar light
Image with oblique lighting
The color difference between gold and silver is distinguished and the unevenness of the gloss minimized.

Lighting Technique of the Bar Type Light
A bar light allows uniform irradiation over a large area. In order to prevent regular reflected light which causes halation to occur, the bar light is fixed at an angle. The diffused reflected light is used for photography and detection. In addition, the use of a polarizing filter is also effective for excessive glossiness.
Oblique light set-up with a bar light

Coaxial Illumination Captures the Light of a Glossy Surface and Releases Light at the Edges of an Engraved Mark

Detection of an Engraved Mark of a Pressed Part
The engraved mark of a part number or specification is recognized by the pattern shape in order to detect a wrong mark or part.
Example set-up using coaxial illumination  
In the case of simple reflected light
Image with simple reflected light
The engraved marks are unclear.
 
In the case of coaxial vertical illumination
Image with coaxial illumination
The edges of the engraved marks stand out.

Coaxial Vertical Illumination Lighting Technique
The coaxial vertical illumination method irradiates light from the same axis of the lens. By irradiating regular reflected light from the glossy surface and releasing diffused light at the edges of the engraved mark, the light and shade of the object can be captured and detected.
Coaxial vertical illumination set-up diagram


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-> A Desktop Reference for Sensors, Vision Systems and Measuring Instruments. General Catalog
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