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研究生： 廖信宇
Liao, Hsin-Yu
論文名稱： 以Android系統智慧型手機開發的高爾夫揮桿過程分析系統
A Golf Swing Analysis System Using Android Smartphones
指導教授： 斯國峰
Ssu, Kuo-Feng
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 電腦與通信工程研究所
Institute of Computer & Communication Engineering
論文出版年： 2013
畢業學年度： 101
語文別： 英文
論文頁數： 41
中文關鍵詞： 智慧型手機 、高爾夫
外文關鍵詞： Smartphone, Golf
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    • 在運動科學這個領域裡，有許多熱門的研究，高爾夫揮桿過程分析就是其中的一種。目前的高爾夫揮桿過程分析研究中，研究者最常使用的有兩種方法。第一種是在使用者身上裝多個感測器，利用感測器傳回的訊號重建揮桿時的動作模型。這種方法常需要將感測器裝在關節節點上，影響使用者關節的活動，使揮桿過程不順暢。另一種方法是使用錄影機錄下使用者的揮桿動作。但是一台錄影機只能有一個視角，如果使用者想從各個角度查看自己揮桿時的動作，就必須架設相對應視角的攝影機，而這通常需要一塊特定的空地才能架設完整的錄影系統。採取這種方法就需要多負擔場地的費用，以及使用者到特定實驗地點的運輸成本。本篇論文提出一個用智慧型手機上的感測器分析高爾夫揮桿動作的方法，並整理成錯誤偵測模型，在找到手部動作上的問題後提供使用者改進建議做為回饋。這個方法利用了現代智慧型手機上普遍配備有感測器群組的特性，將智慧型手機配戴在手臂上，使用者身上只需要一個感測器裝置。另一方面，智慧型手機可以隨身攜帶，所以使用者不用特地跋涉到架設特殊儀器的地點，節省了時間和空間的成本。這篇論文使用Android 系統的手機作為實驗器材，開發出一款應用程式來分析高爾夫揮桿動作。這款應用程式提供兩種模式。第一種預設模式，給揮桿過程會發生特定問題的使用者使用；第二種個人模式，提供經驗豐富且對自己球技有信心的人使用。實驗結果顯示這個方法可以有效地分析高爾夫揮桿過程中手部動作的問題。

    Golf swing motion analysis is one of the most popular research topics in the field of sport science. Nowadays researchers either attach multiple sensors to the golf players' body or deploy cameras to record the golf players' swing motion. If the sensors are attached to the key joints in the human body, the players' swing motion will be affected by the sensors. If the players want to examine their motion comprehensively, multiple cameras and a special place are required. The requirement of a special place will cause transportation and space costs.
    This thesis proposes a brand new mechanism. This mechanism analyzes golf swing motion and provides feedback to the user. By using the sensors equipped on smartphones, the sensing device attached to human body is simplified. Moreover, since smartphone is portable, the transportation and space costs are saved.
    An android application is developed to evaluate the performance of this mechanism. This application provides two modes, default mode and user specific mode, for the golf players. Default mode is designed for players whose golf swing motion contains specific problems. User specific mode is designed for well-experienced players. The experiment results validate that the application is useful for detecting forearm motion during golf swing.

    Chapter 1 Introduction : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 1 2 Related Work : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 3 2.1 Mobile Computing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Sport Science . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 System Model : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 8 4 Proposed Scheme : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 10 4.1 Takeaway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.2 Horizonarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.3 Impact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.4 Followthrough . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5 Analysis : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 18 5.1 Sensor Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.2 Sampling Frequency Decision . . . . . . . . . . . . . . . . . . . . . . . . 20 5.3 Head and Tail Cutting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.4 Threshold Choosing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.4.1 Takeaway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.4.2 Horizonarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.4.3 Impact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.4.4 Followthrough . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.5 Club Dependency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6 Performance Evaluation : : : : : : : : : : : : : : : : : : : : : : : : : : : : 29 6.1 Checkpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.2 Direction Validation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 6.3 Default and User Speci c Mode . . . . . . . . . . . . . . . . . . . . . . . 33 7 Conclusion and Future Work : : : : : : : : : : : : : : : : : : : : : : : : : 35 7.1 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 7.2 Future Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 References : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 38 Vita : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 41

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