Getting-data-from-gait-traces

Getting-data-from-gait-traces - Clinical Research Methods...

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1 Tim Wrigley Centre for Health, Exercise and Sports Medicine (CHESM) School of Physiotherapy, University of Melbourne and Getting Data From Gait Traces Outline • Extracting discrete data parameters from gait traces – What data are we talking about ? • Where is the data ? – Data file types and formats • How do we get at the data ? – Different approaches Tools for data visualization ‘Motion Composer’ Motion Analysis Corp ‘Polygon’ Vicon Extracting discrete data parameters from gait traces What data are we talking about ? Clinical Research Methods in Gait Analysis Gait CCRE, December 2006 Mr Tim Wrigley N - 1
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2 So you’ve decided what data you want to analyse. How do you get at it ? Clinical Research Methods in Gait Analysis Gait CCRE, December 2006 Mr Tim Wrigley N - 2
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3 Where is the data ? Data file types and formats • Binary files • ASCII text files Vicon ‘Eclipse’ database Binary files ‘P’ for ‘Processed’ = C3D binary file ‘V’ for Video (marker 2D coords) = TVD binary file ‘A’ for Analog (force plate, EMG) = VAD binary file Binary files • Cannot be read / written without a ‘specification’, or description, of the file’s contents • Therefore, vendor can choose to keep the format ‘proprietary’ • Require a vendor-supplied or custom- written program to extract data from a specific binary file format Binary files •Sma l les t • Fast to read / write • Most efficient • Sometimes complex content • Generally used to store ‘raw’ recorded data • Use . .. as much as possible Clinical Research Methods in Gait Analysis
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