Lab 5 - Introduction to Motion Analysis using VICON

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University of Ottawa *

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2315

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Psychology

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Dec 6, 2023

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Uploaded by jeremiahzephir

APA 2315 – Introduction to Applied Biomechanics University of Ottawa 1 APA 2315 Lab 5 - Introduction to Motion Analysis using VICON Jeremiah zephir 300130890 ( 15 marks ) OBJECTIVES: 1. To become acquainted with motion analysis using VICON; 2. To understand the basic principles of the VICON motion capture system. EQUIPMENT: VICON cameras and data acquisition system, computer equipped with VICON Nexus and Visual 3D software, force plates, reflective surface markers, marker adhesives, motion capture suits, anthropometer and a scale INTRODUCTION: This lab serves as an introductory lesson on the VICON motion capture system. Motion analysis is at the foundation of biomechanics. By analyzing the movements of humans as they carry out activities, biomechanists develop a thorough understanding of what specific movement parameters are involved (kinematics), what causes the movements (kinetics), what causes associated injuries (injury biomechanics), and how these injuries can be avoided (via changes to coaching techniques, improvements to equipment, use of new materials for joint replacements, etc.). Motion capture and analysis also have applications outside of clinical settings in equipment testing for athletic apparel, video games, movies, etc. Systems used to capture and analyze motion have been in existence for decades and have improved a great deal over the years: from recording film-based video images of subjects outfitted with markers and manually digitizing each marker, to the auto-labelling of reflective markers collected digitally through infra-red cameras, for example. Biomechanists now have the capacity to collect much larger data sets in a vast number of settings and in a shorter amount of time. VICON is one of the more commonly used motion capture systems. Infrared cameras are placed around a determined collection volume and reflective markers are placed on selected anatomical landmarks of a participant. The light from the infrared cameras reflects off the markers and determines the 3D location of each marker. In order to get movement in 3-dimensions rather than 2-dimensions, three cameras must see each marker. This is the reason why multiple cameras are placed around the entire volume. In this lab, you will learn how to use the VICON system to capture movement and reproduce a 3D image of a person walking (gait). You will see how a participant is “film ed ” using the VICON cameras and the resulting image of their gait pattern that is recreated digitally with the help of reflective markers placed strategically on their lower limbs. The positioning of the markers is very important therefore you will also get a chance to familiarize yourself with anthropometric measurements and bony landmarks which help in placing the markers correctly. METHODOLOGY:

APA 2315 – Introduction to Applied Biomechanics University of Ottawa 2 *Refer to the “Instructions for VICON” document posted on Brightspace for step -by-step details on how to run the system. You do not need to memorize the steps outlined in the document! 1. Select a volunteer to be your participant. This person will wear the VICON motion capture suit and perform a variety of movements in front of the group. 2. Measure and record your participant ’s anthropometr ic data. • Mass (kg) • Height (cm) • Left and right ankle widths (cm) – the medio-lateral distance between malleoli 3. Calibrate the system. 4. Outfit your participant with the reflective markers. 5. Zero the force plates for data collection.

APA 2315 – Introduction to Applied Biomechanics University of Ottawa 3 6. Collect a static trial 7. Inspect and label your static trial. Create a labelling skeleton for use with your dynamic trials. 8. Collect various dynamic trials of different movements. Collect at least one normal walking trial, making sure to give your participant a chance to practice walking naturally while ensuring they step on the desired force plates. 9. To obtain the kinematic variables associated with your data, the data must first be processed such that all markers are correctly labelled and visible during each frame of the motion trial. Check data

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