3d scanning for museums kirk martinez university of southampton
Post on 20-Dec-2015
220 Views
Preview:
TRANSCRIPT
3D Scanning for museums
Kirk Martinez
University of Southampton
Overview
Why?
Techniques availableLaserimage-based
Summary
Motivation
2d representations don’t capture 3D objects well
Any 2-D view can be generated from a single 3-D model.
3D studies can be donemodels can be compared/searched
Examples of scanners
Cyberware Digibotics 3dscanners
MensiPolhemus
Structured light scanning
• example from CNR Italy
Michelangelo project
• by Stanford
• used Cyberware
Arius 3D
• laser based – developed by CNR Canada
• RGB lasers give colour
Issues
•Some objects can be very large e.g. building
•Objects can be very complex e.g. lots of holes
•Lighting conditions often very important
•File formats and browsers
•Cost
Image-based 3D reconstruction techniques
• Image sequences of rotating objects• Two approaches used:
– Silhouette-based only approach: CANON software– Silhouette and multi-stereo technique: GET-ENST
approach• For less complex objects with textured surface • Required:
– good quality image sequences (precise turntable, good lighting, photographic know-how)
– good silhouette segmentation
Turntable approach
• ENST scanner
3D laser acquisition & reconstruction
• Using MINOLTA Vi 900 laser scanner (ARCHIDATA)
• Using reconstruction software– Rapidform® (C2RMF, Cherbourg) – Maya® (Quai Branly)
• User partners involved– White clay Gallo-Roman figurines and moulds:
• C2RMF - Bourbon-Lancy
• C2RMF - Moulins
– Miscellaneous• C2RMF - Cluny
• Cherbourg
• Quai Branly (external partner, negotiation for collaboration in progress)
Outdoor scanning example
• Coloseum in Rome with Minolta laser scanner
3D Laser: Cherbourg
Cherbourg_laser 17 Cherbourg_laser 13 Cherbourg_laser 12
Cherbourg_laser 03 Cherbourg_laser 18 Cherbourg_laser 14
Image-based 3D reconstruction: VAM
33 objects: statuettes, ceramic French vases
GET-ENST silhouette and multi-stereo technique
3D
Image-based 3D
Image acquisition
Camera calibration
3DReconstruction
Texture mapcreation
57639 sommets, 115282 triangles
Results
385355 sommets770209 triangles
233262 sommets466520 triangles
Scanner laser 3D MinoltaMethode proposée
Results compared with laser
bigHead buddha dragon
masque twins
african3
Image-based 3D reconstruction: GET-ENST Examples
Summary
•Cost / quality / time trade-offs
•Techniques vary in:•mesh quality•texturing quality
•some scanners are better suited to some materials•smaller 3D models are simple to put on Web
top related