1. 1 Hands and face tracking for VR applications Adviser: Chih-Hung Lin Date:2010/12/14 Speaker: Chin He Hsu Javier Varona, Jose’ M. Buades, Francisco J. Perales Unidad de Gra´ficos y Visio´n por Ordenador, Dept. de matematiques i Informatica, Universitat de les Illes Balears (UIB), crta. Valldemossa km. 7,5, 07122 Palma de Mallorca, Spain

2. 2 Outline 1.Introduction 2. Hands and face tracking algorithm 3.Visualization using H-Anim 4.Conclusion and future work

3. 3 1.Introduction In order to allow a user to navigate in a 3D- space

4. 4 Interactive 3D-space

5. 5 system must detect a new user –entering into the system’s environment –analyse him to set parameters –tracking interesting regions

6. 6 2. Hands and face tracking algorithm tracking problem lies in identifying both hands and face in each image –detect skin-colour pixels –data association algorithm

7. 7 2.1. Skin-colour segmentation module skin-colour detection –necessary to model the actor’s skin-colour in a previous step

8. 8 skin-colour sample transform these pixels from the RGB-space to HSL-space –hue and saturation values contain the chroma information two main problems –human skin hue values are near the red colour –saturation values are near 0

9. 9

10. 10 skin-colour distribution Gaussian model

11. 11

12. 12 Contours of skin-colour blobs after the connected components process

13. 13 2.2. Data association module

14. 14 Next linear scheme of prediction that an extreme limb will maintain the same velocity

15. 15 Set of hypothesis

16. 16 define an approximation to the distance from the x image pixel to the hypothesis h

17. 17 calculating the angle Normalized image pixel and the hypothesis centre

18. 18

19. 19 distance between an image pixel and a hypothesis if d( x,h) 0, then x is outside the hypothesis h

20. 20 a blob with empty intersection with all hypotheses a pixel x of a blob is inside a limb hypothesis

21. 21 Occlusion case solved using multiple labelling

22. 22

23. 23 2.3. 3D-point reconstruction

24. 24 Complete procedure: color segmentation, data association and 3D reconstruction

25. 25 3. Visualization using H-Anim H-Anim (humanoid animation) we use the H-Anim standard, this way we can collaborate with standard VRML (Virtual Reality Modeling Language ) models

26. 26 3D position

27. 27 4. Conclusion and future work proposed a new system human–computer interaction future work