3d scanning for museums kirk martinez university of southampton
Post on 20-Dec-2015
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3D Scanning for museums
Kirk Martinez
University of Southampton
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Overview
Why?
Techniques availableLaserimage-based
Summary
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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
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Examples of scanners
Cyberware Digibotics 3dscanners
MensiPolhemus
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Structured light scanning
• example from CNR Italy
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Michelangelo project
• by Stanford
• used Cyberware
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Arius 3D
• laser based – developed by CNR Canada
• RGB lasers give colour
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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
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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
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Turntable approach
• ENST scanner
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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)
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Outdoor scanning example
• Coloseum in Rome with Minolta laser scanner
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3D Laser: Cherbourg
Cherbourg_laser 17 Cherbourg_laser 13 Cherbourg_laser 12
Cherbourg_laser 03 Cherbourg_laser 18 Cherbourg_laser 14
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Image-based 3D reconstruction: VAM
33 objects: statuettes, ceramic French vases
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GET-ENST silhouette and multi-stereo technique
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3D
Image-based 3D
Image acquisition
Camera calibration
3DReconstruction
Texture mapcreation
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57639 sommets, 115282 triangles
Results
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385355 sommets770209 triangles
233262 sommets466520 triangles
Scanner laser 3D MinoltaMethode proposée
Results compared with laser
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bigHead buddha dragon
masque twins
african3
Image-based 3D reconstruction: GET-ENST Examples
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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