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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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Specific Lighting Techniques

Application of Oblique Lighting
While regular reflected light is easily affected by the surface variation of objects, oblique lighting is more stable because it captures diffuse reflection. This section introduces several types of oblique lighting examples.

Position a Ring Light Closer
Application of Oblique Lighting Because the object is illuminated at a very shallow angle, the light reflected from the glossy area will scatter. This method is effective for distinguishing areas with varying levels of reflectivity but similar colors.
Application Examples
Detection of print on an MD case.
Detection of scratches on film or glass.
Image with a distant ring light Image with a close ring light Example set-up using a close ring light

Diagonally Positioning an Area Light
Diagonally positioned area lights This basic illumination technique allows a large, reflective area to be evenly illuminated by positioning two area lights at opposite 45-degree angles.
Application Examples
Contamination on a film or glass.
Detection of print or stickers on food containers.
Image with an area light directly above Image with area lights at an angle Example set-up using diagonal area lights

Indirect Lighting
Indirect lighting   A camera and lights are placed inside a box made of white and non-glossy internal walls. The lights are positioned upwards so that an object is illuminated with indirect light reflected from the walls. Because the object is illuminated from multiple directions, an image can be captured without any shadowing.



Application Examples
Distinguishing the color of bottles.
Image with direct lighting Image with indirect lighting Example set-up using indirect lighting


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