The report for the PIMS Industrial Problem Solving Worskhop (Calgary, 1998) is here. You can also read about this work in an article that appeared on May 26, 1999 in The London Times. This is an interview with Prof. Chris Budd (one of the workshop participants) who talks about some of the issues in designing algorithms for trip wire identification.
You can take a look at the Matlab code and images used throughout the workshop. At the moment, I have nothing more elegant than a gzipped tar file. If you are looking for more information, please send me an e-mail (stockie @ math.sfu.ca), which might encourage me to spend some more time on this!