Vehicle Speed Measurement Methodology Robust to Playback Speed-Manipulated Video File

Kyu Sun Shim, Nam In Park, Jin Hwan Kim, Oc Yeub Jeon, Heejo Lee

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Concomitant with the virtual ubiquity of dashcams in vehicles, the instantaneous speed of vehicles during accidents can now be measured using dashcam videos to understand the causes of such accidents. In this study, we estimated vehicle speeds using dashcam videos recorded in various road environments and analyzed them by comparing them to ground truth. We also considered various scenarios yielding retaken and re-encoded videos from additional recording devices, depending on the circumstances, wherein the original video can be manipulated in terms of playback speed and/or frames per second. The experimental results revealed that the actual and measured speeds were similar for most user-specific intervals. Moreover, the results suggest that our estimated speed is adequately valid as evidence, regardless of retake and re-encoding states. Furthermore, we adopted a statistical approach (i.e., Pearson's correlation coefficient analysis) to verify the proposed vehicle speed estimation method. The results showed that when playback speed was manipulated in re-encoded or retaken video, the proposed method consistently measured speeds at 99.99 % accuracy. This verified method will play an important role in deriving reliable results from various evidential video sources.

Original languageEnglish
Pages (from-to)132862-132874
Number of pages13
JournalIEEE Access
Publication statusPublished - 2021

Bibliographical note

Funding Information:
This work was supported by the National Forensic Service under Grant NFS2021DTB02, Ministry of the Interior and Safety, Republic of Korea and the Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Ministry of Science and ICT, Republic of Korea (No.2019-0-01343 Regional strategic Industry convergence security core talent training business, and No.IITP-2021-2020-0-01819 ICT creative consilience program).

Publisher Copyright:
© 2013 IEEE.


  • Dashcam
  • re-encoded video
  • retake
  • vehicle speed measurement
  • video forensic
  • video manipulation

ASJC Scopus subject areas

  • General Computer Science
  • General Materials Science
  • General Engineering


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