[Talk-GB] mapping tunnels

[Robert (Jamie) Munro]

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Thom Shannon wrote:
> actually ASN looks a bit smarter than that.
> 
> Here's another crazy idea. Use a video camera close to the road (I have
> a bullet cam that can be mounted on a car) then pattern match the images
> to track motion (like an optical mouse does) then combine that with a
> trace from a digital compass. Then by taking gps readings at either end
> of the tunnel you can calibrate those traces to counter cumulative
> error. You should then be able to get a really accurate trace.

You might be better off using a ordinary forwards facing camera, and
match-mover software (like boujou) that the use in movie effects to work
out the camera movement and add virtual elements. There seems to be a
free match-mover (camera tracker) package at
http://digilab.uni-hannover.de/docs/manual.html
that's probably worth a try.

Jamie
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