The results of the implementation of the Plug-In Gait model in Visual3D will differ slightly from the Vicon PIG implementation, but the differences are sufficiently modest that there are no clinically significant differences. Visual3D uses either Segment Optimization or Global Optimization pose estimation algorithms. Plug-In Gait uses a Direct (Non-Optimal) Pose Estimation for computing the position and orientation of each segment based on a set of 3 tracking markers. In this tutorial, we describe this implementation of Vicon's Plug-In Gait using Visual3D. Workstation or Nexus users will be familiar with the Plug-In Gait variation as Vicon's implementation of the CGM. We highly recommend reading the Tutorial: Building a Conventional Gait Model prior to going through this tutorial. The conventional gait model (CGM) has many variations and can go by many names: Helen Hayes, Vicon Clinical Manager, Newington, and Cleveland Clinic to name a few. Please report any errors to This tutorial has been updated. While every effort has been made to ensure the correct implementation of the Plug-In Gait model in Visual3D, some differences may still persist, most likely caused by the different pose estimations used within Nexus and Visual3D.
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