Hallöchen!

Bruno Postle writes:

> [...]
>
> I still think Hugin (and the Calibrate Lens tool) could help with
> this by automatically submitting optimised lens properties
> whenever it finds a 'good stitch'.  We had a discussion about this
> here:
> http://thread.gmane.org/gmane.comp.misc.ptx/21536/focus=21604

This may be an interesting "Wisdom of Crowds" approach in general
but not usable for the Lensfun database in my opinion.  I consider
it a lot of work to convert the log file into a peer-reviewed
Lensfun database entry.  The most prominent problem is the EXIF
hell.  Besides, begging for contributions works quite well.  We've
added 100 lenses in the last 6 months via
<http://wilson.bronger.org/calibration>.

By the way, while Hugin is the primary *source* of Lensfun data, I
don't really see much benefit for Hugin *using* Lensfun.  Hugin
supports more fit parameters than Lensfun, the FOV always has to be
fitted anyway, and you want to have a profile of your lens specimen.
Moreover, Lensfun optimises the behaviour at the edges, while Hugin
optimises the behaviour at the stitching seams.

FWIW, I have never taken lens data from Lensfun when I stitched
panoramas, although I'm the most active Lensfun developer at the
moment.

Tschö,
Torsten.


P.S.: Funny enough, Robert Fendt states in the above referenced
discussion: "The current approach also has the problem that it sets
d=1-(a+b+c), which changes the apparent focal length of the lens."
Exactly about this we've had a discussion on this list this week.
;-)
-- 
Torsten Bronger    Jabber ID: [email protected]
                                  or http://bronger-jmp.appspot.com

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