Affiliation: | 1. School of Information Technology and Engineering (SITE), University of Ottawa, 800 King Edward Avenue, Stn A, P.O. Box 450, Ottawa, Ontario, Canada, K1N 6N5 2. MIRALab, University of Geneva, 24 rue General Dufour, 1211, Geneva-4, Switzerland 3. IMI, NTU, Singapore, Singapore 4. Autodesk Research, 210 King Street East, Toronto, Ontario, M5A 1J7, Canada
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