Berkeley COMPSCI 184 - Lecture Notes (20 pages)

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Lecture Notes



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Lecture Notes

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Lecture Notes


Pages:
20
School:
University of California, Berkeley
Course:
Compsci 184 - Foundations of Computer Graphics
Foundations of Computer Graphics Documents

Unformatted text preview:

CS 184 Computer Graphics Lecture 20 Motion Capture Prof James O Brien University of California Berkeley V2011 S 20 1 0 Today Motion Capture 2 Motion Capture Record Use motion from physical objects motion to animate virtual objects Simplified Pipeline Setup and calibrate equipment Record performance Process motion data Generate animation 3 Basic Pipeline Setup Record Process Animatio n From Rose et al 1998 4 What types of objects Human whole Portions Facial body of body animation Animals Puppets Other objects 5 Capture Equipment Passive Optical Reflective markers IR typically illumination Special cameras Fast high res filters Triangulate for positions Images from Motion Analysis 6 Capture Equipment Capture Equipment Passive Optical Advantages Accurate use many markers Passive OpticalMay Advantages No cables Accurate High frequency May use many markers No cables Disadvantages High frequency Requires lots of processing Disadvantages Expensive 100K Requires lots of Occlusions processing Expensive systems Marker Swap Occlusions Lighting camera limitations Marker swap Lighting camera limitations 7 Capture Equipment Active Optical Similar to passive but uses LEDs Blink IDs no marker swap Number of markers trades off w frame rate Phoenix Technology Phase Space 8 Capture Equipment MagneticCapture Trackers Equipment Transmitter emits field Trackers sense field Trackers Magnetic Trackers report positionemits and orientation Transmitter field Trackers sense field Trackers report location and orientation May be wireless Control 9 Capture Equipment Electromagnetic Advantages 6 DOF data No occlusions Less post processing Cheaper than optical Disadvantages Cables Problems with metal objects Low er frequency Limited range Limited number of trackers 10 Capture Equipment Electromechanical Analogus 11 Capture Equipment Puppets Digital Image Design 12 Performance Capture Many studios regard Motion Capture as evil Synonymous with low quality motion No directive creative control Cheap



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