?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F239%2F&rft.title=Accuracy+of+a+video+odometry+system+for+trains&rft.creator=Blount%2C+Maurice&rft.creator=Dellar%2C+Paul&rft.creator=Gravesen%2C+Jens&rft.creator=MacLaurin%2C+James&rft.creator=McBurnie%2C+Sarah&rft.creator=Stewart%2C+Andrew&rft.creator=Szotten%2C+David&rft.creator=Whittaker%2C+Robert&rft.creator=Wood%2C+Dave&rft.creator=Leese%2C+Robert&rft.subject=Transport+and+Automotive&rft.description=Reliable+Data+Systems+is+developing+a+video-based+odometry+system+that+enables+trains+to+measure+velocities+and+distances+travelled+without+the+need+for+trackside+infrastructure.+A+camera+is+fixed+in+the+cab%2C+taking+images+of+the+track+immediately+ahead%2C+at+rates+in+the+range+25%E2%80%9350+frames+per+second.+The+images+in+successive+frames+are+%E2%80%98unwarped%E2%80%99+to+provide+a+plan+view+of+the+track+and+then+matched%2C+to+produce+an+%E2%80%98optical+flow%E2%80%99+that+measures+the+distance+travelled.%0D%0A%0D%0AThe+Study+Group+was+asked+to+investigate+ways+of+putting+bounds+on+the+accuracy+of+such+a+system%2C+and+to+suggest+any+improvements+that+might+be+made.%0D%0A%0D%0AThe+work+performed+in+the+week+followed+three+strands%3A%0D%0A(a)+an+understanding+of+how+deviations+from+the+camera%E2%80%99s+calibrated+position+lead+to+errors+in+the+train%E2%80%99s+calculated+position+and+velocity%3B%0D%0A(b)+development+of+models+for+the+train+suspension%2C+designed+to+place+bounds+on+these+deviations%3B%0D%0Aand+(c)+the+performance+of+the+associated+image+processing+algorithms.&rft.date=2008&rft.type=Study+Group+Report&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F239%2F1%2FRDS-AccuracyOfAVideoOdometrySystemForTrains.pdf&rft.identifier=++Blount%2C+Maurice+and+Dellar%2C+Paul+and+Gravesen%2C+Jens+and+MacLaurin%2C+James+and+McBurnie%2C+Sarah+and+Stewart%2C+Andrew+and+Szotten%2C+David+and+Whittaker%2C+Robert+and+Wood%2C+Dave+and+Leese%2C+Robert++(2008)+Accuracy+of+a+video+odometry+system+for+trains.++%5BStudy+Group+Report%5D+++++