一個新的步態分析方法及其應用

Abstract

在這篇論文裡，我們設計了一個將G-sensor及陀螺儀放在鞋後跟的穿戴式裝置，並用來收集人的步態資訊。我們可以從Sensor中的資料中取得詳細的步態階段資訊(Gait Phase Information)，所提取的步態階段起始點或結束點的時間誤差會小於0.215秒。而且我們也建立一個步態有向圖用來描述一個完整的步態(左右腳各一)。在這個有向圖上的應用非常多樣，我們用此作為走路速度的估計，所估計出來的速度誤差大約為0.5km/hr，然而在實驗中發現假如速度接近受測者平時走路的速度，這個誤差會接近0.1km/hr。

In this thesis, we designed a wearable device that is a shoes with G-sensor and gyroscope attached at the ankle position. We show that, using the information acquired from the G-sensor and gyroscope at that position, we could extract the different phases of a gait. The error of the starting and ending time of the extracted result were less than 0.215 seconds. A directed graph with information associated with the nodes as well as edges could be built to well describe a gait. This graph has varies applications. In this thesis, we show that estimation of the walking speed using the directed graph is possible. The estimated speed has error 0.5 km/hr, but close to 0.1 if experiment was done under the speed that the subject is used to.