000178155 001__ 178155
000178155 005__ 20181203022740.0
000178155 0247_ $$2doi$$a10.1016/j.jbiomech.2012.06.009
000178155 022__ $$a0021-9290
000178155 02470 $$2ISI$$a000308854400018
000178155 037__ $$aARTICLE
000178155 245__ $$aAn effortless procedure to align the local frame of an inertial measurement unit to the local frame of another motion capture system
000178155 269__ $$a2012
000178155 260__ $$aOxford$$bElsevier$$c2012
000178155 300__ $$a4
000178155 336__ $$aJournal Articles
000178155 520__ $$aInertial measurement units (IMUs) offer great opportunities to analyze segmental and joints kinematics. When combined with another motion capture system (MCS), for example, to validate new IMU-based applications or to develop mixed systems, it is necessary to align the local frame of the IMU sensors to the local frame of the MCS. Currently, all alignment methods use landmarks on the IMU's casing. Therefore, they can only be used with well-documented IMUs and they are prone to error when the IMU's casing is small. This study proposes an effortless procedure to align the local frame of any IMU to the local frame of any other MCS able to measure the orientation of its local frame. The general concept of this method is to derive the gyroscopic angles for both devices during an alignment movement, and then to use an optimization algorithm to calculate the alignment matrix between both local frames. The alignment movement consists of rotations around three more or less orthogonal axes and it can easily be performed by hands. To test the alignment procedure, an IMU and a magnetic marker were attached to a plate, and 20 alignment movements were recorded. The maximum errors of alignment (accuracy ± precision) were 1.02° ± 0.32° and simulations showed that the method was robust against noise that typically affect IMUs. In conclusion, this study describes an efficient alignment procedure that is quick and easy to perform, and that does not require any alignment device or any knowledge about the IMU casing
000178155 6531_ $$aAlignment procedure, motion capture system, inertial sensor, local frame, wearable system
000178155 700__ $$0242455$$aChardonnens, Julien$$g154773
000178155 700__ $$0240351$$aFavre, Julien$$g119513
000178155 700__ $$0240167$$aAminian, Kamiar$$g104385
000178155 773__ $$j45$$k13$$q2297–2300$$tJournal of Biomechanics
000178155 8564_ $$uhttp://www.sciencedirect.com/science/article/pii/S0021929012003417$$zURL
000178155 909C0 $$0252052$$pLMAM$$xU10303
000178155 909CO $$ooai:infoscience.tind.io:178155$$pSTI$$particle$$qtest
000178155 917Z8 $$x154773
000178155 917Z8 $$x104385
000178155 917Z8 $$x154773
000178155 937__ $$aEPFL-ARTICLE-178155
000178155 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000178155 980__ $$aARTICLE