Frame-level temporal calibration of unsynchronized cameras by using longest consecutive common subsequence

Youlu Wang, Senem Velipasalar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

We present a computationally efficient and robust method for temporally calibrating video sequences from unsynchronized cameras by using object trajectories. Existing methods remain restricted in terms of their assumptions, and/or they are computationally expensive. To match and align the object trajectories, and thus to recover the frame offset between video sequences, we present an algorithm that is based on the Longest Consecutive Common Subsequence. The candidate frame offsets are obtained from each matched trajectory pair, and then a confidence check is performed. The algorithm is robust against possible errors due to background subtraction and location extraction, and can handle large frame offsets. We present experimental results for different frame offset values on different video sequences, which show the robustness of the algorithm in recovering the frame offsets. We also compare the presented algorithm with our previous work to demonstrate the computational efficiency provided.

Original languageEnglish (US)
Title of host publication2009 IEEE International Conference on Acoustics, Speech, and Signal Processing - Proceedings, ICASSP 2009
Pages813-816
Number of pages4
DOIs
StatePublished - Sep 23 2009
Externally publishedYes
Event2009 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2009 - Taipei, Taiwan, Province of China
Duration: Apr 19 2009Apr 24 2009

Publication series

NameICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
ISSN (Print)1520-6149

Other

Other2009 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2009
CountryTaiwan, Province of China
CityTaipei
Period4/19/094/24/09

Keywords

  • Frame offset
  • Longest consecutive common subsequence
  • Temporal calibration
  • Trajectory alignment
  • Unsynchronized cameras

ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering

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