Abstract
Mobile and handheld electronic products such as smartphones and dashboard cameras are frequently used to record occurrences of traffic accidents nowadays. Most existing studies require at least one entire lane marking as a reference to calculate a certain amount of driving distances and are not adapted to a targeted vehicle with a rapidly changing speed in a short time. Therefore, existing approaches cannot provide the desired accuracy of speed estimation in real-life scenarios. In this study, we obtain dynamic time and space data from recorded footage using dashboard cameras and then apply photogrammetry and cross-ratio methods to estimate the vehicle speed. In addition, the proposed method is applied to other cars' speed estimation and ego-speed estimation even though both cars are moving. The experimental results show that given the frame rate on the recorded footage, our proposed method only needs one object in each frame to estimate the vehicle speed even at a rapidly changing speed. Our proposed method shows that the difference between the estimated speed and the reference speed by the Global Positioning System (GPS) is smaller than 1 km/h when only one car is on the move, and smaller than 3 km/h when both cars are on the move. Nevertheless, the difference between the estimated speed and the reference speed is between 1.46 km/h and 5.28 km/h when one car moves by AUPD method. To our knowledge, there is no existing method that estimated the front vehicle speed when both cars are on the move using dashboard cameras.
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Data availability
The data that support the findings of this study are available from Wen-Chao Yang but restrictions apply to the availability of these data, which were used under license for the current study, and so are not publicly available. Data are however available from the authors upon reasonable request and with permission of Wen-Chao Yang (una135@mail.cpu.edu.tw). For replicability, we make the cross-ratio calculation function in an Excel file available to the public and could be downloaded from https://dtcloud.cpu.edu.tw/index.php/s/8uxSU2BRQ2KaTj7.
Abbreviations
- GPS:
-
Global Positioning System
- CCTV:
-
Closed-circuit television
- VSEM:
-
Vehicle speed estimate method
- DVR:
-
Digital video recorder
- EDR:
-
Event data recorder
- MPH:
-
Miles per hour
- 3D:
-
Three-dimensional
- 2D:
-
Two-dimensional
- NIST:
-
The National Institute of Standards and Technology
- SWGIT:
-
The Scientific Working Group on Imaging Technology
- SWGDE:
-
The Scientific Working Group on Digital Evidence
- PUPD:
-
The pictorial unit pixel distance
- AUPD:
-
The actual unit pixel distance
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Acknowledgements
This work on this paper was supported by the Ministry of the Interior, Republic of China (Taiwan). (Project No. 112-0805-02-28-01).
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Yang, WC., Jiang, J., Mao, A. et al. The study on the estimation of vehicles speed using a dashboard camera. Multimed Tools Appl 83, 45777–45798 (2024). https://doi.org/10.1007/s11042-023-17171-2
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DOI: https://doi.org/10.1007/s11042-023-17171-2