1. Machine Vision
Lighting
By Sam Mitchell
10/5/2012

2. Lighting Components

3. Lighting Components Linear Lights Spot Lights Ring Lights
Used to light a rectangle or along a path
There are also curved linear lights
Spot Lights
Used to illuminate specific areas
Adjustable distances and spot sizes
Ring Lights
Goes “around” camera
Can mount to lenese
Light to Camera Connectors
Connects the light to the camera.
Used to only activate the necessary lights so the rest of the area can be dark
Color filters
Changes the light to the ideal color to improve analysis

4. Limitations/Pitfalls
Color
When using a color light, the color on the opposite side of the wheel appears very dark
Contrast
There needs to be a big enough contrast between the environment and part.

5. Color

6. Use Specular reflection
Light reflected off target directly back to camera.
Effective for inspecting highly reflective targets (i.e. glass)
Diffuse reflection
Light dispersed in many directions off surface of target.
Effective for inspecting targets through reflective packaging.
Transmitted light
Light applied from behind target, camera sees target silhouette.
Effective for dimensional measurements.

7. Class Problem
If you were to use machine vision to recognize the defects on oranges what kind of light would you use?

8. Class Problem
If you were to use machine vision to recognize the defects on oranges what kind of light would you use? Diffuse orange colored

9. Industry Standard
The connectors from camera to control seem to be an industry standard
Industry standard for mounting

10. Videos http://www.youtube.com/watch?v=7lGjMw2hUBs

11. Summary
Lighting is used to setup the scene so that the image comes out clear and can be processed correctly.
Watch out for color, ambient light and reflections

12. References Paper http://www.smartvisionlights.com/