Re: [hugin-ptx] help for new user

[Bruno Postle]

On Mon, 27 Dec 2021, 18:38 dgjohnston, wrote:

>
> Bruno … thanks for your quick responses on this forum.  It is very much
> appreciated.
> 1. Am I correct in saying that when hugin optimizes for translation that
> the canvas always stays at 0,0,1 and then the x,y,z values basically move
> the camera position of each photo so that the control points line up as
> best as possible?
>

Yes

2. When hugin optimizes for translation is there one photo that stays at
> Z=0?
>

Usually yes, the anchor photo will stay at 0,0,0, but you can put it
wherever you like, and dragging the set around the preview in 'mosaic' mode
will change the xy values

-- 
Bruno

>

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Re: [hugin-ptx] help for new user

[dgjohnston]

> On Dec 27, 2021, at 11:21 AM, Bruno Postle  wrote:
> 
> On Mon, 27 Dec 2021, 15:37 Donald Johnston, wrote:
> Bruno, when hugin loads a number of photos does it base its initial Z value 
> for the output camera on the photo marked as the anchor? 
> And then optimize other Z values to that?
> 
> The xyz values for the viewpoint of the output panorama are always 0,0,0. 
> When you create a new project, all the photos are initially assigned 0,0,0 as 
> well, since the assumption is that you are not doing any translation/mosaic 
> trickery.

Bruno … thanks for your quick responses on this forum.  It is very much 
appreciated.
1. Am I correct in saying that when hugin optimizes for translation 
that the canvas always stays at 0,0,1 and then the x,y,z values basically move 
the camera position of each photo so that the control points line up as best as 
possible?
2. When hugin optimizes for translation is there one photo that stays 
at Z=0?
Don J.

> 
> -- 
> Bruno
> 
> -- 
> A list of frequently asked questions is available at: 
> http://wiki.panotools.org/Hugin_FAQ 
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> https://groups.google.com/d/msgid/hugin-ptx/CAJV99Zj8KUb8ezKExwEOa4DNGH1vhnyEFP_ssFoYzyCzSZ4ukg%40mail.gmail.com
>  
> .

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[hugin-ptx] help for new user

[Jon Schewe]

I'm piecing together a family tree that I took photos of with the
camera on my phone. I made sure to have some overlap across the images
so that I could stitch them together later. Now that I'm doing that
stitching I'm having a hard time getting a few of the images to line up
correctly. 80% of them are correct, but a few are not. In one case 2
images are offset vertically from where they should be. In another case
I'm getting duplicated data. In both cases I've found all of the
overlapping images and added numerous control points between them.
However that doesn't appear to fix things.

I'm sure this is user error as I'm very new to using Hugin. I've read
through a few of the tutorials and for the most part things just work,
but I'm not sure about the proper workflow for making these changes.
Currently I do the following:
1. add control points
2. click optimize
3. stitch
I then check the result and then repeat
Should I instead be using align instead of optimize? What's the
difference between these two operations?

I have 34 images, should I start with just a couple and build up rather
than loading all of them at once?

For the projection. I expect that the lens type should be rectlinear. 
For the output, I'm not sure what is best. Rectlinear doesn't appear to
handle the wide image. Equirectangular appears better. I've also tried
cylindrical, which handles the size, but curves the lines.

An oddity I've noticed is that the GL preview turns into a blank window
for me when making changes. I need to change the interface view and
then it shows up.

A minor oddity is that my PNG output files have a PNG offset. When
opening in Gimp I get prompted for what to do with this. If I ignore
it, the final image is visible, if I use it the image is shifted to one
side and much of the image is missing. 

I'm using Hugin version: 2019.2.0.b690aa0334b5 on Ubuntu Linux. I've
also tried version 2020.0.0.2f576e5d5b4a installed via Flatpak.

Any and all help is greatly appreciated. If it helps, I can post the
images and some of the results on my website.


Jon

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