Inertial Measurements for Tongue Motion Tracking Based on Magnetic Localization with Orientation Compensation.
Inertial Measurements for Tongue Motion Tracking Based on Magnetic Localization with Orientation Compensation.
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DOI：
10.1109/jsen.2020.3046469
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发表时间：
2021-03-15
影响因子：
4.3
通讯作者：
Inan OT
中科院分区：
文献类型：
--
作者：
Sebkhi N;Bhavsar A;Anderson DV;Wang J;Inan OT
永磁定位（PML）是专为需要毫米级精度的非视线运动跟踪的应用而设计的。当前基于PML的舌头跟踪不仅由于许多传感器被放置在嘴周围而对于日常使用是不切实际的，而且还需要大量的跟踪器运动训练集。我们的方法旨在通过生成局部磁场并消除使用示踪剂旋转训练定位的需要来克服这些缺点。惯性测量单元（IMU）被用作在由磁条产生的局部磁场中移动的示踪剂。可以优化磁强度以使条带能够被放置得更远离示踪剂，从而从视野中隐藏。示踪物很小（6×6×0.8 mm3），以减少对自然舌头运动的阻碍，并且条带被设计为作为颈带佩戴。IMU的磁力计测量局部磁场，通过使用IMU的加速度计和陀螺仪补偿示踪剂的方向。然后将取向补偿的磁测量结果馈送到估计示踪剂的3D位置的定位算法中。本研究的目的是评估我们方法的跟踪准确性。在8×8×5 cm 3体积中，在沿着俯仰和滚转旋转±50°的示踪剂上实现了1.6 mm（中位数）和2.4 mm（第三四分位数，Q3）的位置误差。这些结果表明，该技术在舌头跟踪应用中很有前途。
Permanent magnet localization (PML) is designed for applications requiring non-line-of-sight motion tracking with millimetric accuracy. Current PML-based tongue tracking is not only impractical for daily use due to many sensors being placed around the mouth, but also requires a large training set of tracer motion. Our method was designed to overcome these shortcomings by generating a local magnetic field and removing the need for the localization to be trained with tracer rotations. An inertial measurement unit (IMU) is used as a tracer that moves in a local magnetic field generated by a magnet strip. The magnetic strength can be optimized to enable the strip to be placed further away from the tracer, thus hidden from view. The tracer is small (6×6×0.8 mm3) to reduce hindrance to natural tongue movements, and the strip is designed to be worn as a neckband. The IMU’s magnetometer measures the local magnetic field which is compensated for the tracer’s orientation by using the IMU’s accelerometer and gyroscope. The orientation-compensated magnetic measurements are then fed into a localization algorithm that estimates the tracer’s 3D position. The objective of this study is to evaluate the tracking accuracy of our method. In a 8×8×5 cm3 volume, positional errors of 1.6 mm (median) and 2.4 mm (third quartile, Q3) were achieved on a tracer being rotated ±50° along both pitch and roll. These results indicate this technology is promising for tongue tracking applications.
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影响因子：
4.3
作者：
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2009-04-01
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