presenter : yu chen advisor : jian-jiun ding, jian-hua wang
TRANSCRIPT
![Page 1: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/1.jpg)
3D Accelerometer Presenter : Yu Chen
Advisor : Jian-Jiun Ding , Jian-Hua Wang
![Page 2: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/2.jpg)
Introduction 3D Accelerometer Applications about 3D accelerometers A Real-Time Human Movement Classifier Analysis of Acceleration Signals using
Wavelet Transform Conclusion Reference
Outline
2
![Page 3: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/3.jpg)
Introduction 3D Accelerometer Applications about 3D accelerometers A Real-Time Human Movement Classifier Analysis of Acceleration Signals using
Wavelet Transform Conclusion Reference
Outline
3
![Page 4: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/4.jpg)
Accelerometer is a device which can detect and measure acceleration.
Introduction
xv
t
2
2
xa
t
4
![Page 5: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/5.jpg)
There are a lot of types of accelerometers
◦ Capacitive◦ Piezoelectric◦ Piezoresistive◦ Hall Effect◦ Magnetoresistive◦ Heat Transfer
Introduction
5
![Page 6: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/6.jpg)
Introduction
6
![Page 7: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/7.jpg)
Introduction 3D Accelerometer Applications about 3D accelerometers A Real-Time Human Movement Classifier Analysis of Acceleration Signals using
Wavelet Transform Conclusion Reference
Outline
7
![Page 8: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/8.jpg)
Basic Principle of Acceleration◦ Velocity is speed and direction so any time there
is a change in either speed or direction there is acceleration.
◦ Earth’s gravity: 1g◦ Bumps in road: 2g◦ Space shuttle: 10g◦ Death or serious injury: 50g
3D Accelerometer
F ma
8
![Page 9: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/9.jpg)
Basic Accelerometer◦ Newton’s law◦ Hooke’s law◦ F = kΔx = ma
3D Accelerometer
ka x
m
9
![Page 10: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/10.jpg)
Piezoelectric Systems
3D Accelerometer
10
![Page 11: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/11.jpg)
Electromechanical Systems
3D Accelerometer
11
![Page 12: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/12.jpg)
Tilt angle
3D Accelerometer
12
![Page 13: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/13.jpg)
Introduction 3D Accelerometer Applications about 3D accelerometers A Real-Time Human Movement Classifier Analysis of Acceleration Signals using
Wavelet Transform Conclusion Reference
Outline
13
![Page 14: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/14.jpg)
Calculate the user’s walking state Analyze the lameness of cattle Detect walking activity in cardiac
rehabilitation Examine the gesture for cell phone or
remote controller for video games
Applications about 3D accelerometers
14
![Page 15: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/15.jpg)
Introduction 3D Accelerometer Applications about 3D accelerometers A Real-Time Human Movement Classifier Analysis of Acceleration Signals using
Wavelet Transform Conclusion Reference
Outline
15
![Page 16: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/16.jpg)
A Real-Time Human Movement Classifier
16
![Page 17: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/17.jpg)
Human body’s movements are within frequency below 20 Hz (99% of the energy is contained below 15 Hz)
Median filter◦ remove any abnormal noise spikes
Low pass filter◦ Gravity◦ bodily motion
A Real-Time Human Movement Classifier
17
![Page 18: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/18.jpg)
Activity and Rest
◦ Appropriate threshold value
◦ Above the threshold -> active◦ Below the threshold -> rest
A Real-Time Human Movement Classifier
0 0 0
1( ( ) ( ) ( ) )t t t
SMA x t dt y t dt z t dtt
18
![Page 19: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/19.jpg)
A Real-Time Human Movement Classifier
Walk
Upstair
Downstair
19
![Page 20: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/20.jpg)
Introduction 3D Accelerometer Applications about 3D accelerometers A Real-Time Human Movement Classifier Analysis of Acceleration Signals using
Wavelet Transform Conclusion Reference
Outline
20
![Page 21: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/21.jpg)
Wavelet Transform
Analysis of Acceleration Signals using Wavelet Transform
g[n]
h[n]
2
2
g[n]
h[n]
2 xLL[n]
2 xLH[n]
g[n]
h[n]
2
2
xHL[n]
xHH[n]
x[n]
xL[n]
xH[n]
21
![Page 22: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/22.jpg)
Introduction 3D Accelerometer Applications about 3D accelerometers A Real-Time Human Movement Classifier Analysis of Acceleration Signals using
Wavelet Transform Conclusion Reference
Outline
22
![Page 23: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/23.jpg)
Recent Research Direction◦ Statistical property◦ Wavelet transform◦ Signal feature
Future Research Direction◦ Machine learning◦ Time frequency analysis
Conclusion
23
![Page 24: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/24.jpg)
Introduction 3D Accelerometer Applications about 3D accelerometers A Real-Time Human Movement Classifier Analysis of Acceleration Signals using
Wavelet Transform Conclusion Reference
Outline
24
![Page 25: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/25.jpg)
P. Barralon, N. Vuillerme and N. Noury, “Walk Detection With a Kinematic Sensor: Frequency and Wavelet Comparison,” IEEE EMBS Annual International Conference New York City, USA, Aug 30-Sept 3, 2006
M. Sekine, T. Tamura, M. Akay, T. Togawa, Y. Fukui, “Analysis of Acceleration Signals using Wavelet Transform,” Methods of Information in Medicine, F. K. Schattauer Vrlagsgesellschaft mbH (2000)
Elsa Garcia, Hang Ding and Antti Sarela, “Can a mobile phone be used as a pedometer in an outpatient cardiac rehabilitation program?,” IEEE/ICME International Conference on Complex Medical Engineering July 13-15,2010, Gold Coast, Australia
Reference
25
![Page 26: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/26.jpg)
Niranjan Bidargaddi, Antti Sarela, Lasse Klingbeil and Mohanraj Karunanithi, “Detecting walking activity in cardiac rehabilitation by using accelerometer,”
Masaki Sekine, Toshiyo Tamura, Metin Akay, Toshiro Fujimoto, Tatsuo Togawa, and Yasuhiro Fukui, “Discrimination of Walking Patterns Using Wavelet-Based Fractal Analysis,” IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING, VOL. 10, NO. 3, SEPTEMBER 2002
“ Accelerometers and How they Work ” “ Basic Principles of Operation and Applications of the
Accelerometer ” Paschal Meehan and Keith Moloney - Limerick Institute of Technology.
Reference
26
![Page 27: Presenter : Yu Chen Advisor : Jian-Jiun Ding, Jian-Hua Wang](https://reader033.vdocuments.mx/reader033/viewer/2022061618/56649dc65503460f94ab9d0f/html5/thumbnails/27.jpg)
From the lecture slide of “ Time Frequency Analysis and Wavelet Transform” by Jian-Jiun Ding
27
Reference