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Motion capture

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Aswanth Talaseela
Aswanth Talaseela

Motion capture involves sensing and recording human or object motion as 3D data. There are several motion capture methods, including prosthetic, acoustic, electromagnetic, optical fiber, and optical. Optical motion capture uses reflective markers and high-speed cameras to capture high accuracy marker data. The motion data goes through processing like cleanup and mapping to digital characters. Motion capture is used extensively in movies for animating realistic characters and scenes but has limitations like expense and inability to add more expression than what is captured. Future improvements may include markerless motion capture and cheaper systems.

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Motion Capture Technology by T.Aswanth Id no-12006270 No-49(sec-D)
What is Motion Capture? Motion capture (mocap) is sampling and recording motion of humans, animals and inanimate objects as 3d data for analysis, playback and remapping.
Motion Capture of an object involves sensing, digitizing, and recording that object in motion • Whole body • Hands ,Limbs • Face • One way of acting out an animation
History of Motion Capture • Eadweard Maybridge (1830-1904) • Etienne-Jules Marey (1830-1904) • Harold Edgerton (1903-1990) Marey and Maybridge conducted human and animal motion studies by shooting multiple photographs of moving subjects over a short period of time. Harold Edgerton was the inventor of flash photography.
There are primarily five methods in motion capture. They are :  Prosthetic (or Electromechanical)  Acoustic  Electromagnetic  Optical fiber  Optical
 Prosthetic Motion Capture uses Potentiometers on the plastic exoskeleton that an actor must “wear”, and then act out their movements. This is very accurate and transmits real-time data at a far greater range than any other technology.
 Acoustic Motion Capture uses audio transmitters on the actor’s body and Set of microphones receive sound waves.  Other sounds in frequency range can disrupt capture  Accuracy not as high as other systems  Limited Rage and Limited number of sensors
 This approach has a central magnet with several receivers attached to the actor’s body. The receivers capture and record the actors movements and save them to the computer.  This motion capture method can be hindered by nearby metal objects if they are large enough and depending on the power of magnets being used.
 Fiber-optic sensor  Bend and twist sensors measure transmitted light  No occlusion  Multiple subjects  Portable  Adjustment to individual proportions is limited  Less accurate data
 Reflective markers  High speed capture  High data accuracy  Multiple Cameras that digitize different views of performance
Production Process: Sensor Calibration Subject Calibration Record Movements Marker Data Cleanup Convert to Joint Angles Mapping to characters
Post Processing:  Motion Editing: Cut, Copy, Paste  Motion Warping: Speed up or Slow Down Rotate, Scale or Translate  Motion Signal Processing: Smoother Motions
Limitations of MOCAP o Subject to data inaccuracy o Expensive o Only realistic motion captured o Cartoony Animations not possible o WYSIWYG (what you see is what you get) o Can’t add more expression o Continally need to recapture motion
The Future of MOCAP  Markerless MOCAP  Cheaper MOCAP  MOCAP as Input to Large Displays
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 $8’495 - $21’925 Vicon (Optical) 166-10’000 1/117’600in or 0.02 of a Pixel up to 4MP No camera limit 500 Sony, Nintendo, Microsoft, Boeing, $89’170 - $209’920 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 - $102’315 Gypsy (Mechanical) wireless possible 12-120 No Absolute position 1° 200m 42 $20’000 - $27’000 Stats:
Feature Films: • Avatar • Curious Case of BenjaminButton • Pirates of the Carribean • The Incredible Hulk • Lord of the Rings • Polar Express • Matrix • Kocchadaiyan • Dawn of the planet of the apes
Motion capture
Conclusion: Motion capture (MOCAP) is an effective 3D animation tool for realistically capturing human motion
Any Questions ?????
Thank you!!!!

More Related Content

Motion capture

  • 1. Motion Capture Technology by T.Aswanth Id no-12006270 No-49(sec-D)
  • 2. What is Motion Capture? Motion capture (mocap) is sampling and recording motion of humans, animals and inanimate objects as 3d data for analysis, playback and remapping.
  • 3. Motion Capture of an object involves sensing, digitizing, and recording that object in motion • Whole body • Hands ,Limbs • Face • One way of acting out an animation
  • 4. History of Motion Capture • Eadweard Maybridge (1830-1904) • Etienne-Jules Marey (1830-1904) • Harold Edgerton (1903-1990) Marey and Maybridge conducted human and animal motion studies by shooting multiple photographs of moving subjects over a short period of time. Harold Edgerton was the inventor of flash photography.
  • 5. There are primarily five methods in motion capture. They are :  Prosthetic (or Electromechanical)  Acoustic  Electromagnetic  Optical fiber  Optical
  • 6.  Prosthetic Motion Capture uses Potentiometers on the plastic exoskeleton that an actor must “wear”, and then act out their movements. This is very accurate and transmits real-time data at a far greater range than any other technology.
  • 7.  Acoustic Motion Capture uses audio transmitters on the actor’s body and Set of microphones receive sound waves.  Other sounds in frequency range can disrupt capture  Accuracy not as high as other systems  Limited Rage and Limited number of sensors
  • 8.  This approach has a central magnet with several receivers attached to the actor’s body. The receivers capture and record the actors movements and save them to the computer.  This motion capture method can be hindered by nearby metal objects if they are large enough and depending on the power of magnets being used.
  • 9.  Fiber-optic sensor  Bend and twist sensors measure transmitted light  No occlusion  Multiple subjects  Portable  Adjustment to individual proportions is limited  Less accurate data
  • 10.  Reflective markers  High speed capture  High data accuracy  Multiple Cameras that digitize different views of performance
  • 11. Production Process: Sensor Calibration Subject Calibration Record Movements Marker Data Cleanup Convert to Joint Angles Mapping to characters
  • 12. Post Processing:  Motion Editing: Cut, Copy, Paste  Motion Warping: Speed up or Slow Down Rotate, Scale or Translate  Motion Signal Processing: Smoother Motions
  • 13. Limitations of MOCAP o Subject to data inaccuracy o Expensive o Only realistic motion captured o Cartoony Animations not possible o WYSIWYG (what you see is what you get) o Can’t add more expression o Continally need to recapture motion
  • 14. The Future of MOCAP  Markerless MOCAP  Cheaper MOCAP  MOCAP as Input to Large Displays
  • 15. 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 $8’495 - $21’925 Vicon (Optical) 166-10’000 1/117’600in or 0.02 of a Pixel up to 4MP No camera limit 500 Sony, Nintendo, Microsoft, Boeing, $89’170 - $209’920 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 - $102’315 Gypsy (Mechanical) wireless possible 12-120 No Absolute position 1° 200m 42 $20’000 - $27’000 Stats:
  • 16. Feature Films: • Avatar • Curious Case of BenjaminButton • Pirates of the Carribean • The Incredible Hulk • Lord of the Rings • Polar Express • Matrix • Kocchadaiyan • Dawn of the planet of the apes
  • 18. Conclusion: Motion capture (MOCAP) is an effective 3D animation tool for realistically capturing human motion