Troubleshooting Point Cloud Registration Issues

Point Cloud Registration Troubleshooting

# Common Registration Problems

1. Poor Scan Overlap
*Symptoms:*
- Large registration errors
- Scans won't align
- Gaps in coverage

*Solutions:*
- Re-scan with additional positions
- Ensure 30%+ overlap between scans
- Use targets in sparse areas

2. Moving Objects
*Symptoms:*
- Ghost points
- Double surfaces
- Registration drift

*Solutions:*
- Filter moving objects in software
- Rescan affected areas
- Use intensity/color filtering

3. Repetitive Geometry
*Symptoms:*
- Scans jump to wrong position
- Systematic offset errors
- Loops don't close

*Solutions:*
- Add targets in repetitive areas
- Use manual correspondence
- Break into smaller registration zones

4. Long Corridors
*Symptoms:*
- Progressive drift
- Bowing or curving
- End points don't match

*Solutions:*
- Add control points along corridor
- Close loops where possible
- Use bundle adjustment

# Quality Metrics

Acceptable Registration:
- Mean error: <5mm
- Max error: <20mm
- Overlap: >30%

Survey-Grade Registration:
- Mean error: <2mm
- Max error: <5mm
- Constrained to control points

# Software-Specific Tips

Leica Cyclone:
- Use Cloud-to-Cloud for clean data
- Target-based for survey-grade
- Check constraint graph

FARO Scene:
- Auto registration for speed
- Manual QC of weak links
- Use reference scans