[Digikam-users] Hugin Lens Calibrator, LensFun, and digiKam

[JD Rogers]

Yes, back when Marie-Noelle posted long ago, I spent a few one
afternoon taking some shots and selected control points following the
docs, but it didn't work. My experience then was that even after
adding the lines to the lens library, it didn't seem to properly find
the entry and apply the correction. I ran out of time to play with it
back then, but I am interested and will try help if I can.

On a digikam off-topic note: it occurred to me that while the lensfun
method of taking multiple images and locating control points to
calculate distortion is more flexible, potentially more accurate, and
certainly more likely to work across any camera or lens model, there
might be an easier approach. Since for many point-and-shoots like the
S100, the JPG processor does a decent job, it seems like a single shot
taken using raw+jpg (for each focal length / zoom), it should be
possible to determine the distortion correction the camera uses
without the tedious work of multiple images and locating control
points. Anyone aware if this has been implemented?

JDR

On Mon, Feb 11, 2013 at 8:51 AM, Dmitri Popov <dmpop9mm at yahoo.com> wrote:
> Thanks you Gilles and others for your replies and pointers! I'll keep
> trying, and let you know om my progress.
>
> Best,
> Dmitri
>
> ________________________________
> From: Gilles Caulier <caulier.gilles at gmail.com>
> To: digiKam - Home Manage your photographs as a professional with the power
> of open source <digikam-users at kde.org>
> Sent: Saturday, February 9, 2013 10:26 PM
> Subject: Re: [Digikam-users] Hugin Lens Calibrator, LensFun, and digiKam
>
> Dmitri,
>
> In 3.0.0, someone has posted a patch to fix some glitch problem to rendering
> image correction with Lensfun. It's appears in some specific case. Not sure
> that your problem will be fixed with 3.0.0. Look here for details :
>
> https://bugs.kde.org/show_bug.cgi?id=284708
>
> Also, as i use current code from LensFun repository, i can said that next
> version will include new lens profile and work better that last stable 0.2.6
>
> I hope that can help you...
>
> Best
>
> Gilles Caulier
>
>
> 2013/2/9 Benjamin Girault <benjamin.girault at gmail.com>
>
> Hi Dmitri,
>
> 2013/2/9 Dmitri Popov <dmpop9mm at yahoo.com>:
>> I've been trying to create a lens profile for use with the LensFun library
>> (so I could fix lens distortion in digiKam), but I hit the wall. I've
>> written a blog article explaining the problem, and I could use some input:
>>
>>
>> http://scribblesandsnaps.com/2013/02/09/monkeying-around-with-lens-calibration/
>
> Someone on the Hugin mailing list published a tutorial on how to shoot
> photos with the goal of calibrating a lens and a camera and use them
> to get a LensFun profile. Here it is:
>
> http://wilson.homeunix.com/lens_calibration_tutorial/
>
> I haven't tried it so I cannot guarantee anything. Hopefully you can
> get answers to your issue.
>
> Best,
>
> --
> Benjamin.
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