1. Filtering Structured Light Data Detecting the Second Bounce
Authors:
John Palmateer
Boeing Commercial Airplane Group
Scott Sandwith
New River Kinematics
2002 Coordinate Measurement System Committee
Providence, RI

2. Introduction Filtering Structured Light Data
Primary and Secondary Reflections
Noise Reduction Filtering
JWP Row-Column Filter
Plane Angle Dependence
Application: 3D Inspection Automation
Conclusions – Summary

3. Filter Results Filter OFF Filter ON Discontinuity noise Measurements
confusing primary
and secondary
reflections
Scanner
Secondary
reflection
Data clipped
from spheres
Filter OFF
Filter ON

4. Primary and Secondary Reflections
Camera
Secondary
laser spots
Laser
Intersection of
camera LOS with
secondary reflection
Primary
laser spots
Laser image

5. Noise Reduction Filtering
Systematic Noise
In-Plane with Laser and Part Edge
Filter Properties
Plane Angle
Array  n x n

6. JWP Row-Column Filter (1 of 2)
Before
After

7. JWP Row-Column Filter

8. JWP Row-Column Filter (2 of 2)
Before
After

9. Plane Angle Dependence
15 degree filter
20 degree filter

10. Application 3D Inspection Automation

11. Filtering Structured Light Data