Image autoalignment

From EdwardsLab

How do we take two (or more) images and automatically overlay and align them?

These are some notes from a brief discussion with John G.

Here are some links to start

• NEOS data very little metadata
• County GIS better metadata not as good imagery

• Regima
• OSSIM has a registration module
• Vision Workbench would be a good group also

   basically you need to do image pair image based registration on a per image basis
   and build that up recursively
   then use gpc s or some other image to world warp
   it really all depends on how 'loose' your camera is
   but there is lots of image to image registration stuff on the web   SIFT,  SURF

• SIFT Implementations

from #telascience on irc.freenode.net or at http://irc.telascience.org/

Some code here U. Utah for image registration. Its grey scale only but could probably be used OTB, and wouldn't be that hard to make 3 channel. The OSSIM code is the only stuff that would do terrain correction, but that could be run afterwards I think as a separate pass. This is a good concise description of one method commonly built apon Phase correlation and here is a site at UCSB