Camera-based calibration and testing of inertial sensors in 3D joint kinematics estimation

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Camera-based motion capture systems have been widely used for quantifying lower limb joint kinematics during different activities in a laboratory setting. However they are limited by its space requirement and high cost. In recent years, combinations of inertial and magnetic sensors have been introduced as an alternative, with the objective of performing gait analysis in a real life environment. However, there is no unified protocol for processing inertial sensor data which makes the comparison between systems/protocols difficult. HAS-Motion's primary product, Visual3D, is the premier 3D analysis toolkit for 3D biomechanics modeling, analysis, and reporting functions. Currently, Visual3D is capable to process data collected by camera-based motion capture systems, but not the inertial sensor data. HAS-Motion Inc has identified a need to enhance Visual3D's ability in analysing 3D kinematic data collected by inertial sensor-based system. The previous collaboration through an Engage Grant has made substantial progress and validated the usefulness of inertial sensors in estimating 3D joint kinematics using functional calibration protocols. This Engage Plus project is a direct extension of the Engage project. In the project, a stand-alone simple camera-based anatomical calibration protocol in Visual3DServer will be developed to process inertial sensor data and obtain anatomical poses for body segments. The results will be validated with a camera-based motion capture system. Another task is to further validate the methods developed in the Engage Grant with an instrumented treadmill during running tasks. This project will further enhance the collaboration between HAS-Motion and Queen's to develop a stand-alone inertial sensor system in Visual3D. Consequently, it will directly help to increase HAS-Motion's sale of Visual3D to the inertial sensor-based motion analysis users and directly benefit Canadian economy.