結合類神經網路及Kinect深度攝影機之跌倒偵測系統

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廖家偉(Jia-Wei Liao) 查詢紙本館藏

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資訊工程學系

論文名稱

結合類神經網路及Kinect深度攝影機之跌倒偵測系統
(A Fall Detect System Based on Neural Networks with Kinect Depth-Camera)

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摘要(中)

近年來社會面臨老年化日趨嚴重的問題，老人照護議題也越發重要；老
人跌倒的發生頻率高，且常附帶著因延後就醫所帶來的巨大風險，因此跌倒
偵測的相關研究越來越蓬勃發展。本論文開發一套基於結合Kinect 及類神
經網路的跌倒偵測系統，希望在多人情境下，能夠正常運作，使其更貼近現
實生活。本系統使用Kinect 所提供之深度資訊，找出場景中的地面資訊，
再搭配背景相減演算法，找出前景資訊，並進一步追蹤；再利用事前訓練好
的類神經網路模型及選定的特徵，判斷是否有跌倒事件發生，當系統偵測跌
倒時，會記錄當下的畫面以及時間，回傳給照顧者。本論文會針對規則式判
斷可能會發生誤判的情況做探討，及利用類神經網路所帶來的優勢。
本論文設計了六種模擬情境，三種單人情境、三種多人情境，並且比較
規則式判斷及使用類神經網路的實驗結果，探討之間的差別以及誤判的可
能因素。在全部的情境中總共有168 次跌倒事件以及168 次未跌倒事件，
其實驗結果，敏感度(Sensitivity)約為97%，特異度(Specificity)約為90%，
Kappa 值為0.84，證明系統有幾乎與事實吻合的程度。

摘要(英)

Recently, society is faced with the problematic issue of an aging population.
The eldercare issue is extremely important. The frequency of falls in the elderly
is higher than in younger people with a greater risk caused by treatment delay.
Therefore, the research of fall detection systems has been increasing drastically.
This thesis proposes to develop a fall detection system based on neural networks
with Kinect depth-camera. We hope it can operate reliable in a complex
environment or in multi-person scenarios. The system uses raw data of Kinect
depth images to locate the ground in the scene, identify the foreground pixels with
a background subtraction algorithm, and then tracked the foreground for analysis.
Last, the system will judge whether the fall events occurred by using its welltrained
neural networks model and the specified features. When fall events are
detected, the system would record the image and time immediately, then report to
caregivers for efficient aid. Additionally, this thesis will discuss the reasons for
rule decision system’s misjudgment and the advantages of using neural networks.
The performance of the proposed system was verified by six experimental
scenarios. There are three single person and for multi-person experimental
scenarios. After these experiments, we would compare the result of rule decision
system with the proposed system and discuss the difference and the reason of
misjudgment between both of them. Among all of these experimental scenarios:
168 are fall events and 168 are not fall events. The results show the sensitivity
iii
rate and the specificity rate were 97% and 90%, respectively. And the Kappa value
of the proposed system is 0.84 which is higher than 0.80, showing that we have a
reliable system that accurately reflects reality in terms of fall events.

關鍵字(中)

★ Kinect
★ 跌倒偵測
★ 類神經網路
★ 影像監控

關鍵字(英)

★ Kinect
★ fall detect system
★ video surveilleance
★ eldercare
★ neural netwroks

論文目次

摘要 .......................................................................i
ABSTRACT ...................................................................ii
誌謝 .......................................................................iv
目錄 ........................................................................v
圖目錄 ....................................................................vii
表目錄 .....................................................................ix
第一章、緒論 .............................................................. 1
1-1 研究動機研究動機 ...................................................... 1
1-2 研究目的研究目的 ...................................................... 3
1-3 論文架構論文架構 ...................................................... 4
第二章、相關研究 .......................................................... 5
2-1 跌倒偵測跌倒偵測 ...................................................... 5
2-1-1 感測 ..................................................................5
2-1-2 影像式偵測系統 ....................................................... 7
2-1-3 加入機器學習 ......................................................... 9
2-2 類神經網路(Neural Networks) .......................................... 11
2-2-1 類神經網路簡介 ...................................................... 11
2-2-2 倒傳遞類神經網路演算法 (Back-propagation networks) ..................12
2-2-3 放射狀基底函數類神經網路 (Radial Basis Function Networks, RBFN) .... 19
2-2-4 支撐向量機 (Support Vectors Machines, SVM) .......................... 24
2-2-5 深度學習 (Deep Learning) .............................................29
第三章、跌倒偵測系統 ..................................................... 34
3-1 系統架構系統架構 ..................................................... 35
3-1-1 硬體介紹 ............................................................ 35
3-1-2 軟體架構 ............................................................ 36
3-1-3 系統介面說明 ........................................................ 37
3-2 環境建置環境建置 ..................................................... 39
3-2-1 座標轉換 ............................................................ 39
3-2-2 背景相減法 ...................................................... ... 44
3-3 簡單規則判斷式的跌倒偵測系統 .............................. ........... 46
3-4 特徵擷取特徵擷取 ..................................................... 48
3-5 類神經網路訓練類神經網路訓練 ......................................... 52
第四章、實驗設計與結果 ................................................... 55
4-1 實驗設計實驗設計 ..................................................... 55
4-1-1 評估指標 ............................................................ 55
4-1-2 情境設計 ............................................................ 58
4-1-3 不同之類神經網路比較 ............................................... 62
4-1-4 K 折交叉驗證法 (K -Fold cross validation) [40] ...................... 63
4-2 實驗結果實驗結果 ..................................................... 64
4-2-1 規則式判斷跌倒偵測實驗結果 ......................................... 64
4-2-2 四種分類器以及 Neuroph Studio 訓練測試結果 .......................... 66
4-2-3 醫院模擬情境實驗結果 ............................................... 76
4-2-4 卷積類神經網路實驗結果 .............................................. 82
4-2-5 類神經網路跌倒偵測實驗結果 ......................................... 85
第五章、結論與未來展望 .................................................. 87
5-1 結論 .................................................................. 87
5-2 未來展望 ............................................................. 89
參考文獻 .................................................................. 90

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指導教授

蘇木春(Mu-Chun Su)

審核日期

2016-8-8

推文