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Motion capture technology

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