3d scanning for museums kirk martinez university of southampton

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3D Scanning for museums Kirk Martinez University of Southampton

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Page 1: 3D Scanning for museums Kirk Martinez University of Southampton

3D Scanning for museums

Kirk Martinez

University of Southampton

Page 2: 3D Scanning for museums Kirk Martinez University of Southampton

Overview

Why?

Techniques availableLaserimage-based

Summary

Page 3: 3D Scanning for museums Kirk Martinez University of Southampton

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

Page 4: 3D Scanning for museums Kirk Martinez University of Southampton

Examples of scanners

Cyberware Digibotics 3dscanners

MensiPolhemus

Page 5: 3D Scanning for museums Kirk Martinez University of Southampton

Structured light scanning

• example from CNR Italy

Page 6: 3D Scanning for museums Kirk Martinez University of Southampton

Michelangelo project

• by Stanford

• used Cyberware

Page 7: 3D Scanning for museums Kirk Martinez University of Southampton

Arius 3D

• laser based – developed by CNR Canada

• RGB lasers give colour

Page 8: 3D Scanning for museums Kirk Martinez University of Southampton

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

Page 9: 3D Scanning for museums Kirk Martinez University of Southampton

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

Page 10: 3D Scanning for museums Kirk Martinez University of Southampton

Turntable approach

• ENST scanner

Page 11: 3D Scanning for museums Kirk Martinez University of Southampton

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)

Page 12: 3D Scanning for museums Kirk Martinez University of Southampton

Outdoor scanning example

• Coloseum in Rome with Minolta laser scanner

Page 13: 3D Scanning for museums Kirk Martinez University of Southampton

3D Laser: Cherbourg

Cherbourg_laser 17 Cherbourg_laser 13 Cherbourg_laser 12

Cherbourg_laser 03 Cherbourg_laser 18 Cherbourg_laser 14

Page 14: 3D Scanning for museums Kirk Martinez University of Southampton

Image-based 3D reconstruction: VAM

33 objects: statuettes, ceramic French vases

Page 15: 3D Scanning for museums Kirk Martinez University of Southampton

GET-ENST silhouette and multi-stereo technique

Page 16: 3D Scanning for museums Kirk Martinez University of Southampton

3D

Image-based 3D

Image acquisition

Camera calibration

3DReconstruction

Texture mapcreation

Page 17: 3D Scanning for museums Kirk Martinez University of Southampton

57639 sommets, 115282 triangles

Results

Page 18: 3D Scanning for museums Kirk Martinez University of Southampton

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