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Motion Capture in 3D Animation

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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 ... – PowerPoint PPT presentation

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Date added: 18 April 2019
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Title: Motion Capture in 3D Animation


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
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
Capture
Costa-Sousa, M., 2004
9
Calibration
Image Space World Space
(X,Y) (X,Y,Z)
(X,Y) (X,Y,Z)
(X,Y) (X,Y,Z)
10
3D Position Reconstruction (Utopia)
11
3D Position Reconstruction (Reality)
12
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

Device Cost for Body capture (USD)
Mechanical 20000 30000
Electromagnetic 100000 120000
Optical 90000 210000
17
Limitations of MOCAP
  • Only realistic motion captured
  • Cartoony Animations not possible
  • WYSIWYG (what you see is what you get)
  • Cant add more expression
  • Continally need to recapture motion

Robertson, B., 2001
18
The Future of MOCAP
  • Markerless MOCAP
  • Cheaper MOCAP
  • MOCAP as Input to Large Displays

19
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 thats too cool for you!

22
Stats
Input Device Frame Rate Range (hz) Position Accuracy Orientation Accuracy Latency range Maximum Points tracked Use in Movies Cost Range (USD)
Polhemus (Magnetic) 60-240 .03in RMS static 0.00015in at 12in range .15 RMS static 0.0012 at 12in range 3.5ms 5 ft 16 Woody and Hamm in Toy Story, The Chandelier in Beauty and the Beast 8495 - 21925
Vicon (Optical) 166-10000 1/117600in or 0.02 of a Pixel up to 4MP No camera limit 500 Sony, Nintendo, Microsoft, Boeing, 89170 - 209920
Ascension ReActor 2 (Magnetic) 100 0.08cm RMS at 1.52m range 0.5 RMS at 1.52m range 4.11m x 4.11m area 30 99,410 - 102315
Gypsy (Mechanical) wireless possible 12-120 No Absolute position 1 200m 42 20000 - 27000
23
Calibration
24
Outline
  • History
  • Motion Capture Pipeline
  • Limitations
  • Future Work
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