[ptx] Re: hugin snapshot

[spec at webtech.pl]

Rik Littlefield wrote:

> Marek,
>
> What optimization mode are you using in hugin?
> There is a known problem with pairwise optimization, due to hugin's 
> making direct calls into pano12 and overriding some pano12 methods 
> that changed between Max Lyon's version and the current version 
> 2.7.0.6.  Pairwise optimization gives the appearance of working right, 
> but I can see from debug printouts that internally there are 
> mismatched calls.  The other optimization modes go through the 
> PToptimizer utility and should see the same behavior as all other 
> users of the new optimizer.
>
> The new optimizer has been wrung out pretty thoroughly by this point, 
> not only by hugin but also by many users of PTgui and PTAssembler as 
> discussed on the PanoTools forum.  Generally it is reported to be much 
> faster and equally or more robust.  It is particularly good at not 
> getting "stuck in the noise" tweaking parameters but not actually 
> making progress.
> However, there definitely are cases where the new optimizer converges 
> to strange parameter values, where the old one did not.  From my 
> standpoint as the guy who did the optimizer mod, what makes those 
> cases vexing is that the strange parameter values usually turn out to 
> be "better" in the sense of fitting the specified control points with 
> less error, although elsewhere in the image, away from the control 
> points, the fit is worse.  Eventually reports of such problems died 
> down.  I don't know why.  Adding more control points tends to make 
> this problem go away, so increased use of autopano might have been a 
> factor.

I'm definitely going to give it another try then (also because I like 
the actual open source better than original partial open source 
panotools ;)). I'm going to test it with the new snapshot that's going 
to come out I guess pretty soon. Currently I'm stuck with my build, 
which needs to be fixed, and I don't won't go back to one of snapshots 
made in sept.

--
Thanks,
Marek