[gdal-dev] Image registration, gdal?

[conpie]

Greeting to all.
First, i'd like to thank all contributors to gdal/ogr.
For my problem:
i am to write an image registration plugin for a software. looking at qgis,
i'd be happy to mimic the georeferencer and wrap the gdalwarp algorithm.
i've been looking a little at the code, but am still asking myself a few
questions.
The principal would be, what performance/reliability should i be waiting
from the algorithm?
to make it clear, a classical problem in image registration is a user has
taken a great number of gcp, more than needed for the transformation. 
Does the gdalwarp has a internal mechanism to deal with that (which implies
minimizing a metric)?
how much gcp a dataset can hold?
has anyone used gdal for image registration  with an approach itk-like
(optimizer, metric, interpolator, transformations)?
or should i switch to otb/itk right away?

thanks for the answers
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