Re: [hugin-ptx] Hugin making spiral panorama

[Greg 'groggy' Lehey]

On Monday, 19 February 2024 at 14:08:36 -0800, Graham Jantz wrote:
> Hi all, looking for some advice on running Hugin. I have a panorama of 83
> photos that I'm trying to stitch together but the resulting image it's
> giving me is a weird spiral shape. I used the assistant and went through
> adding control points to images the did not have them and this still came
> out.

Occasionally I get something like this, for reasons that I can't
understand.

My workaround, which works in 99% of the cases:  start with a very few
images and align them in the fast panorama preview window.  If the
partial result is good, save the .pto file.  Add another couple of
images, align again.  Save.  Continue until all images have been
aligned.

This is possibly not perfect.  I've recently become aware of the
--linearmatch option to cpfind.  The man page is vague, but my
understanding is that this causes cpfind to search for control points
only in adjacent images.  That might solve the problem, but it won't
work for multi-row panoramas.

> Also don't love that it tried to color correct some of the images.

This problem might go away by itself once the images are correctly
aligned.  But you can tell Hugin not to change the colours.

Greg
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Re: [hugin-ptx] Hugin making spiral panorama

[David W. Jones]

Hmm, sorry, a little hard for me to tell what it's supposed to look 
like. I assume the images with trees are supposed to be the ground, 
therefore should be horizontal. So maybe try adding horizontal control 
points to the tree images. Then try aligning again.


Then I'd try running Hugin's CPFind (prealigned) option. That only looks 
for control points between adjacent images. The spiral you're getting 
might be happening because there are control points between images that 
shouldn't be there. Clean control points (right-click Control Points > 
Clean control points) might help with that.


The Assistant always runs photometric correction. That might be why the 
colors are off. You can remove the photometric correction by going to 
the Photos tab, right-clicking in a blank area of the list, then 
clicking on Reset > Reset photometric parameters.


If none of that helps, I'd start from scratch, and do it manually if you 
hadn't done that before. I'd add horizontal control points first, then 
run the CPfind (prealigned) option. Then run the geometric optimization 
starting with the basic Positions (incremental, starting from anchor), 
then clean control points. Then run the next geometric optimization on 
the list and clean control points again. Stop when you finish the 
Everything without translation step.


Then check and see how the image looks.

Failing that, if you can share your photos somewhere, someone might be 
able to look at it. I won't be able to do that for a couple of weeks, 
unfortunately.


On 2/19/24 12:08, Graham Jantz wrote:
Hi all, looking for some advice on running Hugin. I have a panorama of 
83 photos that I'm trying to stitch together but the resulting image 
it's giving me is a weird spiral shape. I used the assistant and went 
through adding control points to images the did not have them and this 
still came out.


Also don't love that it tried to color correct some of the images.

Sorry if this has been addressed before, new to Hugin.

Screenshot 2024-02-19 150430.png
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