Introduction

Gait analysis is used to assess, plan, and treat individuals with conditions affecting their ability to walk. It is also commonly used in sports biomechanics to help athletes run more efficiently and to identify posture-related or movement-related problems in people with injuries.
'See-Gait' is an innovative and affordable 3D motion capture system for gait analysis, it is designed for use with a treadmill and can work up to jogging speeds. It could be adapted for use in bicycle fitting and analysis.
There are 4 stages to the process

1. Motion Capture

Cameras are placed each side of the subject and capture the 3D co-ordinate of each marker position.

2. Data Acqusition

During the capture sequence the actual joint angles are calculated and displayed on a graph in real time and all the data is saved to file for off line analysis.
An example of some of the extracted data is listed below -
Foot Angle
Knee Angle
Stride length
Cadence
Speed

3. 3D Visualisation

At the end of the capture sequence a moving 3D model is produced that can be viewed from any angle Drag the mouse or swipe the scene below to view the short sequence from different angles

4. Data Analysis

The stored data can be analysed using various tools, an example of which can ve viewed in the short video below showing the trajectories of each marker.