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Updated: Jan 29, 2026

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Synchronization of OpenCap with Force Platforms: Validation of an Event-Based Algorithm.

María Isabel Pavas Vivas1, Diego Alejandro Arturo2, Stefania Peñuela Arango1

  • 1Program in Biomedical Sciences, School of Basic Sciences, Faculty of Health, Universidad del Valle, Cali 760032, Colombia.

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A new algorithm synchronizes markerless motion capture (OpenCap) with force platforms using heel kinematic events. This method enables accurate biomechanical analysis in low-cost settings without hardware triggers.

Keywords:
OpenCapbiomechanical analysisforce platformsmarkerless motion capturesignal synchronization

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Area of Science:

  • Biomechanics
  • Motion Capture Technology
  • Human Movement Analysis

Background:

  • Markerless motion capture systems like OpenCap offer low-cost biomechanical analysis.
  • Integrating OpenCap with force platforms requires precise temporal synchronization without hardware triggers.

Purpose of the Study:

  • To develop an automatic synchronization algorithm for aligning OpenCap kinematics with force platform kinetics.
  • To validate the algorithm's accuracy using heel kinematic events during lower-limb functional exercises.

Main Methods:

  • Developed an algorithm to detect heel contact from OpenCap vertical kinematics.
  • Aligned detected heel contact with the initial rise in vertical ground reaction force from force platforms.
  • Validated the algorithm against a gold standard system using correlation, RMSE, and MAE on vertical ground reaction force.

Main Results:

  • The algorithm successfully synchronized 92.5% of 330 motion records.
  • Validation showed high correlations (r=0.85 at 60°, r=0.81 at 90°) with low error metrics (RMSE < 0.17, MAE < 0.14).
  • Synchronization accuracy was comparable to hardware-triggered systems.

Conclusions:

  • A heel-contact-based algorithm provides accurate synchronization between OpenCap and force platforms.
  • This method enhances biomechanical analysis capabilities in resource-limited clinical, sports, and occupational environments.
  • Enables advanced dynamic analysis using markerless motion capture.