Activity Recognition Using Cell Phone Accelerometers
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1 Activity Recognition Using Cell Phone Accelerometers Jennifer Kwapisz, Gary Weiss, Samuel Moore Department of Computer & Info. Science Fordham University 1
2 We are Interested in WISDM WISDM: WIreless Sensor Data Mining Powerful portable wireless devices are becoming common and are filled with sensors Smart phones: Android phones, iphone Music players: ipod Touch Sensors on smart phones include: Microphone, camera, light sensor, proximity sensor, temperature sensor, GPS, compass, accelerometer 2
3 Accelerometer-Based Activity Recognition The Problem: : use accelerometer data to determine a user s s activity Activities include: Walking and jogging Sitting and standing Ascending and descending stairs More activities to be added in future work 3
4 Applications of Activity Recognition Health Applications Generate activity profile to monitor overall type and quantity of activity Parents can use it to monitor their children Can be used to monitor the elderly Make the device context-sensitive Cell phone sends all calls to voice mail when jogging Adjust music based on the activity Broadcast (Facebook( Facebook) ) your every activity 4
5 Our WISDM Platform Platform based on Android cell phones Android is Google s s open source mobile computing OS Easy to program, free, will have a large market share Unlike most other work on activity recognition: No specialized equipment Single device naturally placed on body (in pocket) 5
6 Our WISDM Platform Current research was conducted off-line Data was collected and later analyzed off-line In future our platform will operate in real-time In June we released real-time sensor data collection app to Android marketplace Currently collects accelerometer and GPS data 6
7 Accelerometers Included in most smart phones & other devices All Android phones, iphones, ipod Touches, etc. Tri-axial accelerometers that measure 3 dimensions Initially included for screen rotation and advanced game play 7
8 Examples of Raw Data Next few slides show data for one user over a few seconds for various activities Cell phone is in user s s pocket Earth s s gravity is registered as acceleration Acceleration values relative to axes of the device, not Earth In theory we can correct this given that we can determine orientation of the device 8
9 Standing 9
10 Sitting 10
11 Walking 11
12 Jogging 12
13 Descending Stairs 13
14 Ascending Stairs 14
15 Data Collection Procedure User s s move through a specific course Perform various activities for specific times Data collected using Android phones Activities labeled using our Android app Data collection procedure approved by Fordham Institutional Review Board (IRB) Collected data from 29 users 15
16 Data Preprocessing Need to convert time series data into examples Use a 10 second example duration (i.e., window) 3 acceleration values every 50 ms (600 total values) Generate 43 total features Ave. acceleration each axis (3) Standard deviation each axis (3) Binned/histogram distribution for each axis (30) Time between peaks (3) Ave. resultant acceleration (1) 16
17 Final Data Set ID Walk Jog Up Down Sit Stand Total Sum %
18 Data Mining Step Utilized three WEKA learning methods Decision Tree (J48) Logistic Regression Neural Network Results reported using 10-fold cross validation 18
19 Summary Results 19
20 J48 Confusion Matrix Predicted Class Walk Jog Up Down Sit Stand A c t u a l Walk Jog Up C l a s s Down Sit Stand
21 Conclusions Able to identify activities with good accuracy Hard to differentiate between ascending and descending stairs. To limited degree also looks like walking. Can accomplish this with a cell phone placed naturally in pocket Accomplished with simple features and standard data mining methods 21
22 Related Work At least a dozen papers on activity recognition using multiple sensors, mainly accelerometers Typically studies only users Activity recognition also done via computer vision Actigraphy uses devices to study movement Used by psychologists to study sleep disorders, ADD A few recent efforts use cell phones Yang (2009) used Nokia N95 and 4 users Brezmes (2009) used Nokia N95 with real-time recognition One model per user (requires labeled data from each user) 22
23 Future Work Add more activities and users Add more sophisticated features Try time-series based learning methods Generate results in real time Deploy higher level applications: activity profiler 23
24 Other WISDM Research Cell Phone-Based Biometric identification 1 Same accelerometer data and same generated features but added 7 users (36 in total) If we group all of the test examples from one cell phone and apply majority voting, achieve 100% accuracy Can be used for security or automatic personalization Interested in GPS spatio-temporal temporal data mining 1 Kwapisz, Weiss, and Moore, Cell-Phone Based Biometric Identification, Proceedings of the IEEE 4 th International Conference on Biometrics: Theory, Applications, and Systems (BTAS-10), September
25 Thank You Questions? 25
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