Hello again, after several weeks of work-related absence...
Prompted by someone mentioning LCP files and the lens model Adobe
implements in their products,
http://download.macromedia.com/pub/labs/lensprofile_creator/lensprofile_creator_cameramodel.pdf
I have done some internet searches.
klaus.fo...@gmail.com wrote:
For the latter cases, when CPs become dodgy, hugin is good enough. It is in
good cases that its limitations get apparent.
Have you actually encountered these limitations? - none of your examples are
anywhere near these limits; their "realworld" problems greatly
Am 27.07.2018 um 22:55 schrieb klaus.fo...@gmail.com:
The limitations also make it necessary that hugin / panotools have to
provide different lens models, as rectangular and fisheye lenses
cannot be unified. With two more odd polynomials they could. It is
amazing how well a Taylor series with
Hi bugbear,
As you notice, the mathematical lens model, despite its shortcoming, does a
halfway decent job at about pixel or half pixel level. In a finished panoramic,
you visually notice when images are misaligned at the seam line.
Hugin's sidekick enblend does a really good job in sorting
Erik Krause wrote:
Am 26.07.2018 um 12:18 schrieb klaus.fo...@gmail.com:
https://mab.to/DNe8WRQgF
Entrance pupil positions should not be more than 5 millimetres apart.
I managed to get this result:
http://erik-krause.de/align-foehl.gif
misalignment is in the magnitude of image blur in the
Am 26.07.2018 um 12:18 schrieb klaus.fo...@gmail.com:
https://mab.to/DNe8WRQgF
Entrance pupil positions should not be more than 5 millimetres apart.
I managed to get this result:
http://erik-krause.de/align-foehl.gif
misalignment is in the magnitude of image blur in the corners. In the
very
Am Donnerstag, 26. Juli 2018 13:42:40 UTC+2 schrieb Erik Krause:
>
> Am 26.07.2018 um 13:32 schrieb klaus...@gmail.com :
> > This difference image shows the misalignment near the corner:
> > http://www.foehl.net/tiff00010002.jpg
>
> This could as well be caused by parallax due to entrance
Am 26.07.2018 um 13:32 schrieb klaus.fo...@gmail.com:
This difference image shows the misalignment near the corner:
http://www.foehl.net/tiff00010002.jpg
This could as well be caused by parallax due to entrance pupil shift.
And it is hard to tell whether chromatic aberration plays a role with
Hallo,
This difference image shows the misalignment near the corner:
http://www.foehl.net/tiff00010002.jpg
Best regards
Klaus
--
A list of frequently asked questions is available at:
http://wiki.panotools.org/Hugin_FAQ
---
You received this message because you are subscribed to the Google
Am Mittwoch, 25. Juli 2018 23:09:40 UTC+2 schrieb Erik Krause:
>
> ...
> The parallax is clearly visible. See the roof of the house move against
> the background: http://erik-krause.de/parallax-foehl.gif
>
Indeed. And I see that the shadow has moved as well.
I have already looked into the 5
Am Mittwoch, 25. Juli 2018 23:12:07 UTC+2 schrieb Erik Krause:
>
> Am 25.07.2018 um 23:09 schrieb Erik Krause:
> >> What I can do is to take some photos while not flying. It will not be
> >> a 360 degrees panoramic but more like 120 to 150 degs, however I can
> >> control the nodal point to a
Am 25.07.2018 um 23:09 schrieb Erik Krause:
What I can do is to take some photos while not flying. It will not be
a 360 degrees panoramic but more like 120 to 150 degs, however I can
control the nodal point to a few mm and typical objects are 100+
metres away.
That would certainly help.
...
Am 25.07.2018 um 22:47 schrieb klaus.fo...@gmail.com:
Thank you for looking into it. While I was sure the drone drifted
barely, and as the photos are taken from 100m height I cannot prove
that it is not parallax.
The parallax is clearly visible. See the roof of the house move against
the
Hi Erik,
Thank you for looking into it. While I was sure the drone drifted barely, and
as the photos are taken from 100m height I cannot prove that it is not parallax.
What I can do is to take some photos while not flying. It will not be a 360
degrees panoramic but more like 120 to 150 degs,
Re your sgn(r)*r**2 mapping function. You can realise with a small aperture,
then a lens with r^2 and r^3 terms which maps your incoming theta onto
sgn(theta)×theta^2 and last a lens converting direction to position.
It is doable, even on a turntable. But you'll get sizeable imaging errors as
Am 25.07.2018 um 15:05 schrieb klaus.fo...@gmail.com:
I am using a free service. Downside is that the 2.5 GB will expire there after
48 hours. Files from a Parrot Anafi drone flight are here:
https://mab.to/baXC9ntbt
It would have been easier if you included only the images that belong to
Why holomorphic?
Because a spherical lens surface parametrised as z(x,y) is holomorphic.
Then light refraction according to Snell's law also gives holomorphic funktions
for the rays. All this if course has a finite convergence radius.
Aspherical corrections are usually even polynomials and
Hallöchen!
klaus.fo...@gmail.com writes:
> [...]
>
> But polar corrdinates are slightly peculiar at vector-r=0, and to
> have them differentiable there the function in r must be odd.
> (More general, odd f(r) for f(r)*sin(2n*phi+phi0) and even f(r)
> for f(r)*sin((2n+1)*phi+phi0)
I agree that
Hallo,
Am Mittwoch, 25. Juli 2018 15:05:30 UTC+2 schrieb klaus...@gmail.com:
>
> Hello,
>
> I am using a free service. Downside is that the 2.5 GB will expire there
> after 48 hours. Files from a Parrot Anafi drone flight are here:
>
> https://mab.to/baXC9ntbt
>
A few observations:
1) On import
Hello Erik,
Am Mittwoch, 25. Juli 2018 17:15:19 UTC+2 schrieb Erik Krause:
>
> Am 25.07.2018 um 16:38 schrieb klaus...@gmail.com :
> > Please compute, in cartesian coordinates, the partial derivative
> d^2/dxdx
> > of the 2-dim mapping function with c=1 as parameter.
> > Hint: you'll
Hallo,
Am Dienstag, 24. Juli 2018 22:13:04 UTC+2 schrieb Erik Krause:
>
> Am 24.07.2018 um 21:01 schrieb klaus...@gmail.com :
>
> > I found an old thread on the panotools wiki.
> >
> > https://wiki.panotools.org/User:Klaus/Improving_Hugin
>
> There probably is one problem we didn't consider
Am 25.07.2018 um 16:38 schrieb klaus.fo...@gmail.com:
Please compute, in cartesian coordinates, the partial derivative d^2/dxdx
of the 2-dim mapping function with c=1 as parameter.
Hint: you'll encounter some x/abs(x) - like terms.
In the wiki discussion you write "sqrt() has a
Am Dienstag, 24. Juli 2018 22:37:35 UTC+2 schrieb Erik Krause:
>
> Am 23.07.2018 um 17:26 schrieb klaus...@gmail.com :
>
> > Non-zero parameters a and c introduce singularities at r=0, something a
> real lens does not have.
>
> Since the correction function itself doesn't have a singularity
Hallo,
Am Dienstag, 24. Juli 2018 21:56:16 UTC+2 schrieb Torsten Bronger:
>
> Hallöchen!
>
> klaus...@gmail.com writes:
>
> > I found an old thread on the panotools wiki.
> >
> > https://wiki.panotools.org/User:Klaus/Improving_Hugin
>
> I find the language hard to understand, sorry. Anyway
Hello,
I am using a free service. Downside is that the 2.5 GB will expire there after
48 hours. Files from a Parrot Anafi drone flight are here:
https://mab.to/baXC9ntbt
Feel free to upload some or all files to more permanent storage.
Best regards
Klaus
--
A list of frequently asked
Am 23.07.2018 um 17:26 schrieb klaus.fo...@gmail.com:
Non-zero parameters a and c introduce singularities at r=0, something a real
lens does not have.
Since the correction function itself doesn't have a singularity at r=0
and all that changes at r=0 is the slope of the curve there is a
Am 24.07.2018 um 21:01 schrieb klaus.fo...@gmail.com:
I found an old thread on the panotools wiki.
https://wiki.panotools.org/User:Klaus/Improving_Hugin
There probably is one problem we didn't consider then: Higher order
polynomials tend to overfit. That might be the reason why professor
Hallöchen!
klaus.fo...@gmail.com writes:
> I found an old thread on the panotools wiki.
>
> https://wiki.panotools.org/User:Klaus/Improving_Hugin
I find the language hard to understand, sorry. Anyway … what is the
argument against even exponents?
> As long as there is no hard vignetting in
Hallo Torsten,
I found an old thread on the panotools wiki.
https://wiki.panotools.org/User:Klaus/Improving_Hugin
As long as there is no hard vignetting in the lens, the reasoning should work.
Best regards
Klaus
--
A list of frequently asked questions is available at:
Hi all,
Thanks for the replies so far. I'll upload some photos in due course. But 1st I
need to fetch suitable photographic material back at home, and 2nd I want to
try to stitch a 360 deg panoramic as this better constrains the FOV fit
parameter.
As the JPGs have filtering artifacts, I'll
Hallöchen!
Gunter Königsmann writes:
> Would that help with cellphone lenses that tend to have a
> different scale in the top left corner than in the lower right
> one?
No. It is all about centrosymmetric aberrations here.
Tschö,
Torsten.
--
Torsten Bronger
--
A list of frequently asked
Would that help with cellphone lenses that tend to have a different scale
in the top left corner than in the lower right one?
Torsten Bronger schrieb am Di., 24. Juli
2018, 07:36:
> Hallöchen!
>
> klaus.fo...@gmail.com writes:
>
> > [...]
> >
> > In these old days I did detail that from the
Hallöchen!
klaus.fo...@gmail.com writes:
> [...]
>
> In these old days I did detail that from the lens parameter set
> abc only the br^3 term is useful. Non-zero parameters a and c
> introduce singularities at r=0, something a real lens does not
> have.
Could you elaborate on this? Possibly by
Am 23.07.2018 um 17:26 schrieb klaus.fo...@gmail.com:
A few days ago I purchased a new camera in the form of the Parrot
Anafi drone. The lens has some fisheye characteristics, similar to
Gopro. I now discover that the available choice of lens types and
parameters only allows bad alignment. It is
34 matches
Mail list logo
