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Fig. 2 | Archives of Physiotherapy

Fig. 2

From: Finite helical axis for the analysis of joint kinematics: comparison of an electromagnetic and an optical motion capture system

Fig. 2

Compensation of the position data error due to the distortion of the electromagnetic field. The top panels a, b show the original coordinates of the trajectories of the second Polhemus sensor during the different acquisitions in top and side view respectively. The bottom panels c, d show the same data after the application of the bidimensional function of the second order that minimizes the distortion in the z axis

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