Motion capture technology

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Motion capture technology

  1. 1. Motion Capture Technology
  2. 2. Introduction• Motion capture is the process of recording human movement through specialised camera’s, and mapping them onto a character model .• Motion capture technology involves sensing, digitizing, and recording that object in motion.• It is also known as Mo-Cap, Virtual Theatre, Real- Time Animation or Performance Animation.
  3. 3. The birth of motion capture Historically, Motion Capture in animated movies was created using the extension of "ROTOSCOPING" technique.
  4. 4. RotoscopingA Rotoscoping is a device that enables animators to trace live action movement, frame by frame, for use in animation.
  5. 5. RotoscopingCaptured Video:Rotoscoping works by firstcapturing a video of a realactor around props thatresembles elements of a scene.
  6. 6. RotoscopingTracing:Animators then trace overeach frame of the recordedvideo, this would result in afigure that moved in avery realistic fashion.
  7. 7. RotoscopingPost Processing:Finally, the animated figuredwould be coloured and thenintegrated with variousbackground layers to createthe final shot.
  8. 8. The MOCAP PipelineCalibrationCaptureFitting to the SkeletonPost Processing
  9. 9. Calibration C 1 C 2Triangulation C 1 = (x , y , z ) 1 1 = (x , y , z ) 1principle!!!! C 2 2 2 2
  10. 10. MOCAP TechniquesThere are three MOCAP techniques:1) Optical2)Magnetic3)Mechanical
  11. 11. Optical
  12. 12. Optical Infra Red cameras
  13. 13. Marker PlacementsLocation should move rigidly with jointsStay away from bulging muscles
  14. 14. Multiple Hypothesis Tracking C1 C2
  15. 15. MagneticMagnetic Transmitter
  16. 16. MechanicalPotentiometers
  17. 17. Fitting to the SkeletonUtopian approach  10 – 20% length changesMarkers on both sidesJoint Displacement θUse Rotation Angles Only
  18. 18. Post ProcessingMotion Editing  Cut, Copy, PasteMotion Warping  Speed up or Slow Down  Rotate, Scale or TranslateMotion Signal Processing  Smoother Motions
  19. 19. ApplicationsEntertainmentMedicineArts / EducationScience / Engineering
  20. 20. Entertainment: Live Action FilmsComputer generated characters in live action films.
  21. 21. Entertainment: 3D computer animationsCharacters in computer animated files (e.g. Avatar, Polar Express, Monster House)
  22. 22. Entertainment: Video GamesVideo games by Electronic Arts, Gremlin, id, RARE, Square, Konami, Namco, and others, (e.g. Enemy Territory)
  23. 23. Games using Motion Capture
  24. 24. MedicineMedicine (e.g., gait analysis, rehabilitation)Sports medicine (e.g. injury prevention, performance analyses, performance enhancement) Gait Analysis Service
  25. 25. Science / EngineeringEngineering (e.g., Biped robot developments)Military (e.g., field exercises, virtual instructors, and role-playing games)
  26. 26. The Future of MOCAP • Markerless MOCAP • Cheaper MOCAP • MOCAP as Input to Large DisplaysBregler et al., 2002
  27. 27. ConclusionMotion capture (MOCAP) is an effective 3D animation tool for realistically capturing human motion.

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