Re: [hugin-ptx] What confuses Hugin

[Carl von Einem]

Hi Steve,

Steve Edmonds wrote on 15.10.16 01:53:


 In this process Hugin itself will correct for perspective in your
 photos, so the images will perfectly match if you have little parallax.


I have a bit of parallax (you will see this in the background) but am
not interested within this exercise in the background, or anything
outside the plane of the window frames and hence why all my control
points are on the frames.
Steve


You identified one of the main problems but choose to ignore it. The 
_huge_ parallax error you introduce with your setup in combination with 
objects at a close distance make the shown images useless for stitching.


Start with finding / adjusting the no-parallax point 
 of your lens.


If you still have no panoramic head try using a philopod. That's simple 
to set up, I still use it a lot: . 
Have a look at  to see what 
effort others put into their shooting setup.


Find an easier to shoot place: outside, maybe the facade of a building, 
no objects in foreground to make still occuring smaller parallax errors 
less of a problem.


Note that shooting in portrait mode is a good idea.

Here is a nice list of tutorials . 
Some may be a bit old but you get the idea, like with this one: 



Carl

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Re: [hugin-ptx] What confuses Hugin

[Steve Edmonds]

>   In this process Hugin itself will correct for perspective in your 
> photos, so the images will perfectly match if you have little parallax.
>

I have a bit of parallax (you will see this in the background) but am not 
interested within this exercise in the background, or anything outside the 
plane of the window frames and hence why all my control points are on the 
frames.
Steve

>

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Re: [hugin-ptx] What confuses Hugin

[Steve Edmonds]

Changing the focal length of the lens does affect the straightness of the 
window frames, but introduces some other problems. At setting 200mm (for 
the images taken with 28mm) the frames are straight in the preview but not 
aligned or perspective corrected.
So may be I am not understanding the lens function correctly and for some 
reason Hugin introduces curvature.

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Re: [hugin-ptx] What confuses Hugin

[Luís Henrique Camargo Quiroz]

  Hi Steve,

  Have you *optimized*, after finding the control points, for yaw, pitch,
roll, and perhaps (better after yaw, pitch, roll, in a second step) also
for positions? It is this optimization that reduces the initial errors and
thus correctly repositions each image in order to build a panorama.
  In this process Hugin itself will correct for perspective in your photos,
so the images will perfectly match if you have little parallax.

  If you did optimized, I did not understand well what could have happened,
so some screenshot of your result, if possible, would clarify for us your
problem.

  Hugin is a great software and you surely should get stunning results with
it.

  Luís Henrique

2016-10-14 4:17 GMT-03:00 Steve Edmonds :

> I have just started to use Hugin.
> After trying to take some pictures with effect in a forest (and failing) I
> did some comparative tests between panorama and wide angle for the same
> HFOV.
> This has led me to delve deeper into the panorama style and the use of
> Hugin. I have a pano head arriving next week.
>
> I am trying to get to grips with Hugin and figure out what throws it out.
> I went back to a very simple window frame with horizontals, verticals and
> straight lines, 3 shot hand held panorama.
> In each image the frame lines are straight within 3 pixels worst case with
> no lens correction. I only add control points manually to marks on the
> frames, control points placed within 1 pixel.
> I can perspective correct each frame individually in Hugin (
> http://hugin.sourceforge.net/tutorials/perspective/en.shtml) and they are
> spot on to easily merge in gimp say.
>
> If I put all 3 images into Hugin and match up the same control points the
> window frame goes all humpty and I the errors are not good.
> I guess I must be doing something to confuse Hugin but can't figure it
> out.
> Should I be perspective correcting the images before combining, does Hugin
> correct each image first and then try to combine or just try to average
> things out.
> Do I need to keep the camera dead level to avoid confusing Hugin, i.e wait
> for the pano head.
> Any help appreciated as this has me a bit baffled.
>
> Steve
>
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> A list of frequently asked questions is available at:
> http://wiki.panotools.org/Hugin_FAQ
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> .
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>



-- 
-- 
Luis Henrique Camargo Quiroz
http://luishcq.br.tripod.com - http://www.christusrex.org/www2/cantgreg
http://panoramaslh.net/

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[hugin-ptx] What confuses Hugin

[Steve Edmonds]

I have just started to use Hugin.
After trying to take some pictures with effect in a forest (and failing) I 
did some comparative tests between panorama and wide angle for the same 
HFOV.
This has led me to delve deeper into the panorama style and the use of 
Hugin. I have a pano head arriving next week.

I am trying to get to grips with Hugin and figure out what throws it out. I 
went back to a very simple window frame with horizontals, verticals and 
straight lines, 3 shot hand held panorama.
In each image the frame lines are straight within 3 pixels worst case with 
no lens correction. I only add control points manually to marks on the 
frames, control points placed within 1 pixel.
I can perspective correct each frame individually in Hugin 
(http://hugin.sourceforge.net/tutorials/perspective/en.shtml) and they are 
spot on to easily merge in gimp say.

If I put all 3 images into Hugin and match up the same control points the 
window frame goes all humpty and I the errors are not good.
I guess I must be doing something to confuse Hugin but can't figure it out. 
Should I be perspective correcting the images before combining, does Hugin 
correct each image first and then try to combine or just try to average 
things out.
Do I need to keep the camera dead level to avoid confusing Hugin, i.e wait 
for the pano head.
Any help appreciated as this has me a bit baffled.

Steve

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