Regime Sorting for Multiscale Vibrations and Phase-Based Motion Extraction

Sean Collier, Tyler Dare

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


While phase-based motion magnification has shown great success in enhancing sub-pixel motion, super-pixel motion has proven more difficult to work with. As “small motion” is usually a major assumption in the derivation of optical flow, large-scale super-pixel motion has been shown to cause artifacts and limit the usability of the method in both magnification and extraction applications. Viable methods do exist and have shown promise for scenarios where unimportant large motions are present in an otherwise ideal video. Likewise, current rules of thumb suggest utilizing a pyramid approach, where the images are downsampled until the motion becomes sub-pixel and thus avoids the issue entirely. However, the approaches for effectively removing these large-scale, super-pixel motions neglect their potential importance for objects which exhibit both super- and sub-pixel motions of interest. Further, for such objects, downsampling could degrade and even obliterate the relevant sub-pixel motion. Therefore, an approach is conceived and developed exploiting this degradation in conjunction with complexity pursuit (a blind source separation technique) to allow for more effective and purposeful processing using the complex steerable pyramid. With greater information in the beginning, rules of thumb and temporal bandpassing can be utilized more effectively to extract viable motion measurements in both regimes of pixel motion.

Original languageEnglish (US)
Title of host publicationRotating Machinery, Optical Methods and Scanning LDV Methods, Volume 6 - Proceedings of the 40th IMAC, A Conference and Exposition on Structural Dynamics, 2022
EditorsDario Di Maio, Javad Baqersad
Number of pages11
ISBN (Print)9783031040979
StatePublished - 2023
Event40th IMAC, A Conference and Exposition on Structural Dynamics, 2022 - Orlando, United States
Duration: Feb 7 2022Feb 10 2022

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


Conference40th IMAC, A Conference and Exposition on Structural Dynamics, 2022
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • General Engineering
  • Computational Mechanics
  • Mechanical Engineering


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