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Interactive Modelling for AR Applications John Bastian, Ben Ward, Rhys Hill, Anton van den Hengel, Anthony Dick
Australian Centre for Visual TechnologiesSchool of Computer ScienceUniversity of Adelaide
Introduction Our method allows users to rapidly build
3D models forManipulation within AR workspaceUse as occlusion masks
Our approach is characterised byAn interactive modelling processModelling by segmentation and silhouette
carving
Overview Video an object with a hand-held webcam Track camera movement with PTAM User selects object in one frame System segments object in subsequent frames Observations are combined to construct the
3D model
Segmentation User marks the object, using a
mouse or the camera Build foreground and background
colour models from user marking Apply graph cut segmentation
Optimal segmentation given colour models and image edges
Additional marking refines the segmentation
Segmentation
Silhouette Carving Use the silhouettes
to generate 3D models
Start with a volume around the object
Remove voxels with projection outside the silhouette
Feedback Current shape estimate is used to
predict subsequent silhouettes Predicted silhouette is used to:
Define cut regionUpdate colour modelsReduce ambiguity when foreground has
similar colour to background
3D Prior Silhouette is predicted from
current shape estimate Initial mesh used until volume
is defined Volume model is used to
generate a confidence map for inclusion of each pixel in the silhouette
User Feedback User can view
the model as its shape evolves
Results
Results
Results
Future Work Register models from a
database to the images Incorporate photoconsistency Use more sophisticated
segmentation Increased automation
Questions?