Comput Methods Programs Biomed - A method to align the coordinate system of accelerometers to the axes of a human body: The depitch algorithm.

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Resumo

One of the key problems in accelerometry based gait analyses is that it may not be possible to attach an accelerometer to the lower trunk so that its axes are perfectly aligned to the axes of the subject. In this paper we will present an algorithm that was designed to virtually align the axes of the accelerometer to the axes of the subject during walking sections. This algorithm is based on a physically reasonable approach and built for measurements in unsupervised settings, where the test persons are applying the sensors by themselves. For evaluation purposes we conducted a study with 6 healthy subjects and measured their gait with a manually aligned and a skewed accelerometer attached to the subject's lower trunk. After applying the algorithm the intra-axis correlation of both sensors was on average 0.89?0.1 with a mean absolute error of 0.05g. We concluded that the algorithm was able to adjust the skewed sensor node virtually to the coordinate system of the subject.

Resumo Limpo

one key problem accelerometri base gait analys may possibl attach acceleromet lower trunk axe perfect align axe subject paper will present algorithm design virtual align axe acceleromet axe subject walk section algorithm base physic reason approach built measur unsupervis set test person appli sensor evalu purpos conduct studi healthi subject measur gait manual align skew acceleromet attach subject lower trunk appli algorithm intraaxi correl sensor averag mean absolut error g conclud algorithm abl adjust skew sensor node virtual coordin system subject

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