KINEMATIC COMPARISON OF OPENCAP AND IMU WITH MARKER-BASED MOTION CAPTURE IN TREADMILL RUNNING: A PILOT STUDY

Authors

Muhammad Nur Shahril Iskandar Mr, National Institute of Education, Nanyang Technological University, SingaporeFollow
Phillis Soek Po Teng Dr, National Institute of Education, Nanyang Technological University, SingaporeFollow

Category

Technology/equipment

Document Type

Paper

Abstract

The purpose of this pilot study was to compare lower-limb running kinematics measured using a markerless system, OpenCap, and inertial measurement units (IMUs) against the marker-based motion capture (mocap) system. One participant ran at 2.22 m/s on a treadmill for one minute. Mean absolute error (MAE) and root mean square error (RMSE) of hip, knee, and ankle flexion were calculated independently for all 3 devices. Time synchronization of devices was facilitated by performing a ‘kick’ and identifying its peak knee angle prior to running. Offset correction was also applied to OpenCap and IMUs data to match those of marker-based mocap data at the start of time synchronization. OpenCap exhibited a higher degree of error than IMUs in all joint angles compared to marker-based mocap both before and after an offset correction was applied, with errors exceeding 10°.

Recommended Citation

Iskandar, Muhammad Nur Shahril Mr and Teng, Phillis Soek Po Dr (2024) "KINEMATIC COMPARISON OF OPENCAP AND IMU WITH MARKER-BASED MOTION CAPTURE IN TREADMILL RUNNING: A PILOT STUDY," ISBS Proceedings Archive: Vol. 42: Iss. 1, Article 136.
Available at: https://commons.nmu.edu/isbs/vol42/iss1/136