Yun-Kyung Kim, Sung-Mok Kim, Hyung-Suk Lho, We-Duke Cho, Journal of Internet Computing and Services, Vol. 12, No. 3, pp. 17-26, Jun. 2011
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Keywords: step count, fri-axial accelerometer, Heuristic Algorithm, Adaptive Threshold Algorithm, Adaptive Locking Period Algorithm

Abstract

We have developed a wearable device that can convert sensor data into real-time step counts. Sensor data on gait were acquired using a triaxial accelerometer. A test was performed according to a test protocol for different walking speeds, e.g., slow walking, walking, fast walking, slow running, running, and fast running. Each test was carried out for 36 min on a treadmill with the participant wearing an Actical device, and the device developed in this study. The signal vector magnitude (SVM) was used to process the X, Y, and Z values output by the triaxial accelerometer into one representative value. In addition, for accurate step-count detection, we used three algorithms: an heuristic algorithm (HA), the adaptive threshold algorithm (ATA), and the adaptive locking period algorithm (ALPA). The recognition rate of our algorithm was 97.34% better than that of the Actical device(91.74%) by 5.6%.

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