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


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


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

ASJC Scopus subject areas

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)


Dive into the research topics of 'Vehicle Speed Measurement Methodology Robust to Playback Speed-Manipulated Video File'. Together they form a unique fingerprint.

Cite this