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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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