Automated Collection of Pedestrian Data through Computer Vision Techniques

Abstract

New urban planning concepts are being redefined to emphasize walkability (a measure of how walker-friendly an area is) and to accommodate the pedestrian as a key road user. However, the availability of reliable information on pedestrian traffic remains a major challenge and inhibits a better understanding of many pedestrian issues. Therefore, the importance of developing new techniques for the collection of pedestrian data cannot be overstated. This paper describes the use of computer vision techniques for the automated collection of pedestrian data through several applications, including measurement of pedestrian counts, tracking, and walking speeds. An efficient pedestrian-tracking algorithm, the MMTrack, was used. The algorithm employed a large-margin learning criterion to combine different sources of information effectively. The applications were demonstrated with a real-world data set from Vancouver, British Columbia, Canada. The data set included 1,135 pedestrian tracks. Manual counts and tracking were performed to validate the results of the automated data collection. The results show a 5% average error in counting, which is considered reliable. The results of walking speed validation showed excellent agreement between manual and automated walking speed values (root mean square error = 0.0416 m/s, R2 = .9269). Further analysis was conducted on the mean walking speed of pedestrians as it related to several factors. Gender, age, and the group size were found to influence the pedestrian mean walking speed significantly. The results demonstrate that computer vision techniques have the potential to collect microscopic data on road users at a degree of automation and accuracy that cannot be feasibly achieved by manual or semiautomated techniques.