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Motion Capture in 3D Animation

Motion Capture in 3D Animation. Edward Tse. Motion Capture as a Tool. Motion capture (MOCAP) is an effective 3D animation tool for realistically capturing human motion . By the Power of Appendix B!!. Outline. Rotoscoping The MOCAP Pipeline Limitations of MOCAP The Future of MOCAP.

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Motion Capture in 3D Animation

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  1. Motion Capture in 3D Animation Edward Tse

  2. Motion Capture as a Tool • Motion capture (MOCAP) is an effective 3D animation tool for realistically capturing human motion

  3. By the Power of Appendix B!! Outline • Rotoscoping • The MOCAP Pipeline • Limitations of MOCAP • The Future of MOCAP

  4. Rotoscoping History • Captured Video Johnston, et al., 1995

  5. Rotoscoping History • Tracing Johnston, et al., 1995

  6. Rotoscoping • Post Processing Johnston, et al., 1995

  7. The MOCAP Pipeline • Calibration • Capture • 3D Position Reconstruction • Fitting to the Skeleton • Post Processing

  8. Infra Red LEDs Mechanical Magnetic Optical Magnetic Transmitter Potentiometers Capture Costa-Sousa, M., 2004

  9. Calibration

  10. 3D Position Reconstruction (Utopia)

  11. 3D Position Reconstruction (Reality)

  12. C1 C2 Ringer, et al., 2002 Multiple Markers • For small number of markers: Size • Occlusions are a problem • Multiple Hypothesis Tracking

  13. Multiple Markers • Mechanical Optical Hybrids http://www.animazoo.com/services/gypsyHybrid.htm

  14. Fitting to the Skeleton • Utopian approach • 10 – 20% length changes • Markers on both sides • Joint Displacement • Use Rotation Angles Only

  15. Post Processing • Motion Editing • Cut, Copy, Paste • Motion Warping • Speed up or Slow Down • Rotate, Scale or Translate • Motion Signal Processing • Smoother Motions

  16. Limitations of MOCAP • Subject to data inaccuracy • Expensive

  17. Limitations of MOCAP • Only realistic motion captured • Cartoony Animations not possible • WYSIWYG (what you see is what you get) • Can’t add more expression • Continally need to recapture motion Robertson, B., 2001

  18. Ngan, S., 2004 hollywoodjesus.com Bregler et al., 2002 The Future of MOCAP • Markerless MOCAP • Cheaper MOCAP • MOCAP as Input to Large Displays

  19. Questions? Conclusion • Motion capture (MOCAP) is an effective 3D animation tool for realistically capturing human motion

  20. References • Johnston, O., Thomas, F., (1995) The Illusion of Life: Disney Animation, Disney Editions, ISBN: 0786860707 • Costa-Sousa, M. (2004) Motion Synthesis, Powerpoint Presentation • Parent, R. (2002) Computer Animation: Algorithms and Techniques, Morgan Kaufmann Publishing • Ringer, M., Lasenby, J. (2002) Multiple Hypothesis Tracking for Automatic Optical Motion Capture, European Conference on Computer Vision (ECCV ’02) • Robertson, B. (2001) Medieval Magic, Computer Graphics World, April 2001. • Tse, E. (2004) The Single Display Groupware Toolkit, MSc Thesis, University of Calgary, Ab, Canada • Bregler, C., Loeb, L., Chuang, E., Deshpande, H., (2002) Turning to the Masters: Motion Capturing Cartoons, Proceedings of ACM Siggraph 2002 pp 399 – 407. • vicon.com, inition.co.uk, polhemus.com, wikipedia.org, animazoo.com, hollywoodjesus.com

  21. Bonus Slides Stuff that’s too cool for you!

  22. Stats

  23. θ 1 θ 2 Calibration

  24. Outline • History • Motion Capture Pipeline • Limitations • Future Work

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