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. 2020 Jun 22;20(12):3534. doi: 10.3390/s20123534

Figure 1.

Figure 1

The hinge joint system that we consider. The two segments rotate independently with respect to each other only along the joint axis j. The sensor frames Si are rigidly fixed to their respective segments and their relative orientation can be described by one joint angle, that corresponds to a rotation about the joint axis. The joint axis expressed in local sensor coordinates is an important sensor-to-segment calibration parameter in joint systems with one degree of freedom (DOF).