The ubiquity of smartphones has made a remarkable influence on everyone's day to day life. Variety of useful built-in sensors provide smartphones with a convenient floor for data collection and analysis. Application development based on the user's location and movement is not a difficult task nowadays. But injuries and deaths due to smartphone-distracted movement on roadways is on the increase. This study explores the capabilities of smartphone inertial sensors for pedestrian activity recognition. Smartphone distracted movements can be predicted from the associated pedestrian's posture, thus inertial sensors can provide effective solution for this specific task. Volunteers were asked to perform different pedestrian activities with smartphones in their hand or in trouser pocket. Accelerometer and gyroscope data were collected, and time windowing was applied for proper segmentation of the data. After time and frequency domain feature extraction of these segmented data streams, two classical supervised machine learning approaches (SVM and Random Forest) were undertaken for correct prediction of seven different pedestrian activity labels. Furthermore, we implemented a deep learning classifier (CNN) for direct activity recognition using raw data. The training and testing procedure includes three types of systems: single-subject, all-subject, and leave-one-subject-out models. For performance evaluation, we used the F-score metric, which can reach up to 92.3%, 98.1% and 97.2% for these three models, respectively. CNN with raw data provides much better accuracy than the classical machine learning models. With the capability to identify pedestrian activity and thus distracted pedestrians with great accuracy, our approach lays the foundation for a smartphone application based real time P2V warning system. In this system, the vehicle's driver gets a warning in his smartphone about the nearby presence of a distracted pedestrian.
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Master of Science (M.S.)
College of Engineering and Computer Science
Civil, Environmental, and Construction Engineering
Civil Engineering; Smart Cities
Length of Campus-only Access
Masters Thesis (Open Access)
Chowdhury, Dhrubo Hasan, "Smartphone Sensor-based Pedestrian Activity Recognition for P2V Communication and Warning System" (2020). Electronic Theses and Dissertations, 2020-. 606.