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Smart path mobile_sensing_for_smart_cities-kk-pratik
- 1. SmartPath A pedestrian safety system December 5, 2017 By: Kamlakant Tripathi, Pratik Navale Instructor: Dr. Shubham Jain Old Dominion University
- 2. Problem 2 Between 2005 and 2014, a total of 46,149 people were struck and killed by cars while walking in the United States. (Source:https://smartgrowthamerica.org/dangerous-by-design/) Nationwide, 22 percent more pedestrians killed last year than two years earlier, according to the Governors Highway Safety Association. (Source:https://www.deseretnews.com/article/865676927/Pedestrian-deaths-on-roads- up-cellphones-partly-to-blame.html)
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- 8. Traffic lights can only do so much!! Even if they are put on ground. 8
- 9. Related work 9 LookUp! The shoe sensors relay inertial sensor measurements to a smartphone, which extracts the step pattern and the inclination of the ground a pedestrian is walking on. Prototype: 1. Shoe-mounted sensor 2. Two android applications for data collection with LookUp safety feature LIMITATION: GPS accuracy can quickly degrade to tens of meters in urban canyons. Not viable for every individual/expensive setup. LookUp! shoe mounted inertial sensor for alerting pedestrians (Source: winlab.rutgers.edu/~shubhamj/papers/m obi251f.pdf) Drowsy Detector facial recognition technology to detect whether drivers are getting drowsy (Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PM C3571819/) Rider Alert uses Bluetooth to alert drivers with an audio / visual alert (Source: http://rideralert.org/)
- 10. Idea Alert distracted pedestrians on their phones Beacons at intersections Smartphone application 10 Our solution
- 11. Beacons at intersections 11 Bluetooth Low Energy (BLE) Altbeacon, Eddystone, iBeacon protocol / standard Placed at pedestrian signals Beacon Traffic Light Bluetooth
- 12. Smartphone application 12 Runs in background Alerts user when in beacon range
- 13. Methodology (Communication flow for a single cycle) 1310 Beacon Is hazard situation created? Walkers cellphone No alert / keep monitoring Preventive action Send data Beacons signal Walkers smartphone Post Analysis Alert & visualization Audible alert / vibration / Text Yes No
- 14. Our implementation Basic Android app - functional Monitoring, ranging and alert notification Monitoring: monitors nearby beacons Ranging: logs distance, Tx, rssi, UUID/Major/Minor Notification: alerts pedestrians when theyre close to intersection Android beacon library by Altbeacon https://altbeacon.github.io/android-beacon-library/ 14
- 15. Our implementation Monitoring - working Ranging - working Notification - working* (*better calibration needed) 15 Log excerpt: Logging information from nearby beacons: distance, Tx, rssi, id Alerts when near a road
- 16. Evaluation Functionality over accuracy Number of positive detections over total trials Accuracy in mind Measured distance values over time and compared to ground truth 16
- 17. Field experiments Data: Exported Logcat data from Android Studio Data format: Text, converted to CSV Data description: Timestamp, Distance, Tx, RSSI, UUID Data collection: Real time, over various distances Data collection frequency: Observations for 60 sec for each distance 17
- 18. Evaluation 18 Tx: -53 dBm Mean RSSI : More deviation at longer distance.
- 19. Evaluation 19 More variation as distance increases. Acceptable for our application.
- 20. Challenges Walking speed of pedestrians High volume of pedestrians (peak time): signal reflection and obstruction Accuracy (App detecting beacon from a min. safe distance) Beacons usually used for locating objects 20
- 21. Challenges Beacon placement: Avoid unnecessary detections Can change alert distance by configuring beacon Alert distance, x : Distance at which alert triggers; y : Beacon range 21 x y
- 22. Challenges Beacon placement: Overhead, on the pole Works best when in line-of-sight of mobile device 22
- 23. Assumptions Pedestrian with mobile device, bluetooth and location enabled Average walking speed 23
- 24. Tools 24 RadBeacon Dot by Radius Networks Software Android Studio (ver. 2.3.3) Android Beacon Library (ver. 2.12.3 by AltBeacon/Radius Networks) Deployed on OnePlus 3 (A3003) Android ver. 8.0 (Oreo)
- 25. Future work Improve functionality overall Incorporate direction to prevent false detections Develop pedestrian monitoring system - count, peak time, jaywalkers Work with better and stable BLE beacons 25
- 26. Takeaway To develop a pedestrian safety system that always works, for all pedestrians using smartphones. 26
- 27. DEMO 27
- 28. 28 Thank you Presented by: K.K. Tripathi Pratik Navale