Adding 3D/Computer Vision

Suppose I wanted to write a program that can "see" outside, where would people recommend I start? 

I am working on a psychology model of plane pilots. My first model was a simple model of performing a take-off in the Cessna. To do this, I simply connected the property tree to my psychology simulation software, and voila. Added a quick and dirty motion detection (using screen shots) to "see" movement (to deal with left turning syndrome during take-off). What I'd like to be able to do next is to see the runway, and any visible buildings in the current view. I had originally thought I'd one day make use of openscenegraph to do this...

Any thoughts? 

Thanks,

Sterling

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