Stereoscopic analysis
There is an old GRASS 5 software in http://grass.osgeo.org/outgoing/grass5/ -> stereo
which is doing this job. It is yet awaiting integration into GRASS 6.
Tutorial: http://grass.osgeo.org/gdp/stereo-grass/index.html
See also
- Stereo anaglyphs wiki page
- Principles of Photogrammetry: Stereoscopic Parallax
- nasa/StereoPipeline: The NASA Ames Stereo Pipeline is a suite of automated geodesy & stereogrammetry tools designed for processing planetary imagery captured from orbiting and landed robotic explorers on other planets