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Human motion can
be captured by placing
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reflective
markers on the joints and then using
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lots of infrared
cameras to track the 3-D
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positions of the
markers.
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Given a skeletal
model, the 3-D positions of the
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markers can be
converted into the joint angles
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plus 6
parameters that describe the 3-D position
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and the roll,
pitch and yaw of the pelvis.
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We
only represent changes in yaw because physics
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doesn’t
care about its value and we want to avoid
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circular
variables.
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