1. 4th February 2003 Animating Scanned Human Models João Fradinho Oliveira* Animating Scanned Human Models Dongliang Zhang** Bernard Buxton* Bernhard Spanlang* * Department of Computer Science, University College London ** CAD/CAM Center Hong Kong University of Science & Technology

2. 4th February 2003 Animating Scanned Human Models 1 - Feature extraction/segmentation 2 - Building the skeleton 3 - LOD to reduce computation 4 - Mapping skin to skeleton/surface growing 5 - Motion capture DEMO & Acknowledgements Overview Background Conclusion

3. 4th February 2003 Animating Scanned Human Models 1 - Feature extraction/segmentation 2 - Building the skeleton 3 - LOD to reduce computation 4 - Mapping skin to skeleton/surface growing 5 - Motion capture DEMO & Acknowledgements Overview Background Conclusion

4. 4th February 2003 Animating Scanned Human Models Standard layered approach Control skeleton + skin e.g. [Sun W et al.] Layered Animation of Captured Data, Animation and Simulation99 Control skeleton has BVH hierarchy Motivation to create skeleton automatically Background Medial axis, Convex Hull Library Control skeleton

5. 4th February 2003 Animating Scanned Human Models 1 - Feature extraction/segmentation [Dekker et al.] Building Symbolic Information for 3D Human Body Modelling Range Data Proceedings of the 2 nd International Conference on 3-D Digital Imaging and modelling, IEEE Computer Society Octree/horizontal slices

6. 4th February 2003 Animating Scanned Human Models 1 - Feature extraction/segmentation Projected contour approach /local maxima Slice approach (binning, changes in Depth) 6 groups of centroids2 levels/phases of feature extraction

7. 4th February 2003 Animating Scanned Human Models 2 - Building the skeleton centroids centroids + landmarks closest centroids to landmarks skeleton

8. 4th February 2003 Animating Scanned Human Models 3 - LOD to reduce computation 135 099 triangles ---------------------------- 4999 triangles 67595 vertices -------------------------------- 2535 vertices

9. 4th February 2003 Animating Scanned Human Models 4 – Mapping skin to skeleton/surface growing Use skeleton + bisector planes, for skin mapping Volume queries, user placement of separation planes A - Select triangle closest to endpoints of skeleton B - Select connected triangles that are behind separation planes

10. 4th February 2003 Animating Scanned Human Models 4 – Mapping skin to skeleton/surface growing

11. 4th February 2003 Animating Scanned Human Models 4 – Mapping skin to skeleton/surface growing Bi-sector separation plane Landmark constrained separation plane

12. 4th February 2003 Animating Scanned Human Models 4 – Mapping skin to skeleton/surface growing STEP 1 – select connected triangles after plane & below small vertical offset of landmark e.g. smallest edge length of model /will also work with a zero offset in all models

13. 4th February 2003 Animating Scanned Human Models 4 – Mapping skin to skeleton/surface growing STEP 2 – select connected triangles above the vertical offset of the landmark & behind the landmark constrained plane

14. 4th February 2003 Animating Scanned Human Models 4 – Mapping skin to skeleton/surface growing mapped skin result

15. 4th February 2003 Animating Scanned Human Models 4 – Mapping skin to skeleton/surface growing W = u Rigid transformation vs Soft transformation Mapping parameters/ vertex attributes

16. 4th February 2003 Animating Scanned Human Models 4 – Mapping skin to skeleton/surface growing Two-link structure Multi-link structure [Weber J.] Run-Time Skin deformation, Game Developers Conference 2000 More on deformation constraints:

17. 4th February 2003 Animating Scanned Human Models 5 - Motion capture DEMO & Acknowledgements Hamamatsu Photonics UK Prof. Mel Slater, EPSRC grant GR/M46082/01 (UK) Fundacao Calouste Gulbenkian (Portugal) Ministerio da Ciencia e Tecnologia (Portugal), JNICT/PRAXIS XXI