It apparently is a modified Levenberg Marquardt, using two strategies.

The function is RunLMOptimizer, but it is in libpano, not in Hugin:

http://panotools.svn.sourceforge.net/viewvc/panotools/trunk/libpano/optimize.c?revision=1297&view=markup

The L-M algorithm is here:
http://panotools.svn.sourceforge.net/viewvc/panotools/trunk/libpano/lmdif.c?revision=1305&view=markup

See also: https://www.email-lists.org/pipermail/ptx/2004-April/001564.html

Cheers,

Seb

On Thu, Dec 9, 2010 at 12:28, Olivier Croquette <[email protected]> wrote:
> Hello !
>
> Does anyone have pointers or documentation about the algorithm behind
> the PTOptimizer ? Is it something standard or howebrewed? Even some
> keywords to google would be very helpful.
>
> Thanks !
>
> --
> Olivier
>
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