Floor plan for Aircraft Hanger

[Colin Williams Photography]

I guys, I am currently documenting the floor of an aircraft hanger. Its a massive task and a huge area. There are muliple bays within the hanger each being around 40m x 60m

I am using a 24mm T&S lens on the Canon R5 which has been mounted to a portable frame facing downward at a height of approximatly 6ft. I have bleedover on two axis to allow for stitching.

There are lots and lots of cracks in the concrete all of which has to be documented with photos. I am moving the camera sideways and have a view of 2m x 1.4m abouts.

Can someone advise me how to stitch these please in PTGui. There are 23 images per row covering the 40m path. I have not been getting any great success with the program so far which is creating doubts on my mind to quit the project and let someone else try. Thank you Colin

[PTGui Support]

Hi Colin,

It should be possible, assuming the floor is flat.

Also I assume the T&S lens is in its neutral position (no tilt and no
shift)?

Also assuming that the lens is pointing perfectly downward and the
distance to the floor is the same in all images.

Then you should be able to stitch the images using the method outlined
in 6.5:
https://ptgui.com/support.html#6_5
So you would need to set the focal length to a very large value.

It's possible that PTGui is not able to find control points for all
images, if there are no discernible cracks, or if the shape of the
cracks is not easily recognized by the control point generator. This
would mean that you would have to add control points manually.

If you can't get it to work, post your project file here and I'll take a
look.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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[Bill Landenberger]

If I understand your task correctly, it sounds like a job more suited to photogrammetry software (e.g. Metashape) rather than PTGui.  As Joost said, it is possible with PTGui, but will pose difficulties.  Photogrammetry would produce a 3D model which you can then produce an orthophoto from (which I assume is what you are after).  You will need at least a 50% overlap between frames.  Anyway, that would be my suggestion.
cheers,
Bill

[PTGui Support]

Well, if the floor is flat, photogrammetry would be overkill and stitching should work fine.

For every other subject with any kind of depth, you’re right, this requires photogrammetry.

Kind regards,

Joost Nieuwenhuijse

ptgui.com

On 10 Jan 2024, at 21:35, Bill Landenberger <billland...@gmail.com> wrote:

If I understand your task correctly, it sounds like a job more suited to photogrammetry software (e.g. Metashape) rather than PTGui.  As Joost said, it is possible with PTGui, but will pose difficulties.  Photogrammetry would produce a 3D model which you can then produce an orthophoto from (which I assume is what you are after).  You will need at least a 50% overlap between frames.  Anyway, that would be my suggestion.

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[Colin Williams Photography]

Hi Bill, yes you got the task in question. I'll have a look at Metashape too, Thank you.

Joost, did you get the two sets of row files earlier?

[PTGui Support]

Hi Colin,

See attached project, this is the best I could get. You need the Pro
version of PTGui (for viewpoint correction).

You should stitch all images together, don't attempt to stitch them in
separate rows.

I first tried the method of Q6.5 in the faq, but this resulted in
misalignment, probably because the camera was not perfectly
perpendicular or due to some other imperfection. Viewpoint correction
worked nice though, here's what I did:

load all images

keep the lens settings as they are (24mm)

go to the optimizer tab and switch it to Advanced

disable yaw/pitch roll optimization of all images

enable viewpoint correction for all images, except the center one, which
should be set to 'reset'. See my project file.

go to Image Parameters and ensure that yaw/pitch/roll of all images are
set to zero

Run Control Points -> Generate Control Points. Don't run Align Images,
it will change some of the above settings.

Run the optimizer.

Panorama editor: switch to rectilinear projection. Manually adjust the
field of view using the sliders.


If you try stitching all images together, make sure that the center
image has viewpoint correction disabled (Reset), and all others have it
enabled.

It's a fairly large project, you might want to disable 'Find Optimum
Seams' while working on it, this improves performance.

One problem you'll run into is that the panorama may not be perfectly
square, you could see curved edges. This is because all images are
aligned relative to the center image; small errors between images
accumulate towards the sides. If it doesn't need to be geometrically
accurate, you can probably straighten it in photoshop. Otherwise you
might have to resort to photogrammetry instead of stitching.

Hope this helps!

Joost

On 10-01-2024 22:55, Colin Williams Photography wrote:
> Hi Bill, yes you got the task in question. I'll have a look at Metashape
> too, Thank you.
>
> Joost, did you get the two sets of row files earlier?
>
> On Wednesday, January 10, 2024 at 9:39:06 PM UTC PTGui Support wrote:
>
> Well, if the floor is flat, photogrammetry would be overkill and
> stitching should work fine.
>
> For every other subject with any kind of depth, you’re right, this
> requires photogrammetry.
>
> Kind regards,
>
> Joost Nieuwenhuijse

> ptgui.com <http://ptgui.com>

>> www.ptgui.com <http://www.ptgui.com>

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