eprintid: 239
rev_number: 13
eprint_status: archive
userid: 7
dir: disk0/00/00/02/39
datestamp: 2009-10-19 09:04:12
lastmod: 2015-05-29 19:50:54
status_changed: 2009-10-19 09:04:12
type: report
metadata_visibility: show
item_issues_count: 0
creators_name: Blount, Maurice
creators_name: Dellar, Paul
creators_name: Gravesen, Jens
creators_name: MacLaurin, James
creators_name: McBurnie, Sarah
creators_name: Stewart, Andrew
creators_name: Szotten, David
creators_name: Whittaker, Robert
creators_name: Wood, Dave
creators_name: Leese, Robert
corp_creators: Richard Shenton
title: Accuracy of a video odometry system for trains
ispublished: pub
subjects: transport
studygroups: esgi64
companyname: Reliable Data Systems
full_text_status: public
abstract: 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, taking images of the track immediately ahead, at rates in the range 25–50 frames per second. The images in successive frames are ‘unwarped’ to provide a plan view of the track and then matched, to produce an ‘optical flow’ that measures the distance travelled.

The Study Group was asked to investigate ways of putting bounds on the accuracy of such a system, and to suggest any improvements that might be made.

The work performed in the week followed three strands:
(a) an understanding of how deviations from the camera’s calibrated position lead to errors in the train’s calculated position and velocity;
(b) development of models for the train suspension, designed to place bounds on these deviations;
and (c) the performance of the associated image processing algorithms.
date: 2008
citation:   Blount, Maurice and Dellar, Paul and Gravesen, Jens and MacLaurin, James and McBurnie, Sarah and Stewart, Andrew and Szotten, David and Whittaker, Robert and Wood, Dave and Leese, Robert  (2008) Accuracy of a video odometry system for trains.  [Study Group Report]     
document_url: http://miis.maths.ox.ac.uk/miis/239/1/RDS-AccuracyOfAVideoOdometrySystemForTrains.pdf