Vehicle trajectory data extraction from the horizontal curves of mountainous roads

ABSTRACT

Trajectory data is essential for understanding the driver-vehicle-road interaction which is crucial for safety and operational assessment. The video image-processing technique is useful to collect such data on the entire traffic stream. Existing techniques assume that the road is planar which limits the application of the video-based traffic data collection to the plain terrains. With the objective to collect trajectory data from mountainous terrain, the present study proposes an approach to convert the pixel coordinates into real-world coordinates. The hypothesis was that a non-planar scene could be converted into a sequence of piece-wise planar scenes with a separate projection matrix for each planar region. The analysis shows that the proposed method could effectively transform the pixel coordinates into the real-world coordinates. Comparison of the estimated and observed speed/path profiles indicate the adequacy of the proposed method in collecting video-based trajectory data from mountainous terrain.

KEYWORDS:

• Naturalistic driving data
• video image processing
• homography matrix
• mountainous roads

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data Availability Statement

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.