stitching issues of dipped surface - gigapixel-panorama

[MIDIC GmbH]

Hello PTGui support,

i have a question regarding rectilinear gigapixel-panorama: The software seems to have issues to stitch photos of a big, flat, dipped surface. The camera-parameters  are allways changing after optimising.

 I have about 900 pics in fullframe-format from a 35mm-objective. After optimising the project changes the parameters to fantasy values like 1500mm or something. I've tried to calculate the panorama row-wise - about 70 pics via the PTGui-Builder but that doesn't work properly.

Do you have some hints for out project? The pictures are from a drone-mounted fullframe camera  with survey-grade GPS-EXIF-data. The overlap of the pictures is 80% sideways and frontal. 

Thanks a lot!

Tilo Krippendorf

MIDIC GmbH

Halle, Germany

[John Houghton]

Tilo, the short answer to your query is that PTGui is not designed to do this sort of stitching. All the photos should ideally be taken with the camera in a fixed position.  Mosaic stitching may be possible in some circumstances:  see FAQ:  https://ptgui.com/support.html#6_4 and 6_5.  It's not clear how the drone is moving in relation to the flat surface.  Is it flying at a constant altitude over the flat surface that slopes away below at an angle, or is it flying to maintain constant distance from the flat surface?

John

[MIDIC GmbH]

Oh, that's bad. 

It wasn't clear, that PTGui isn't appropriate for rectilinear stitching of photos from different positions.  I have just read about this here on top of the forum ^ (after scrolling down accidently in the header section). Maybe it's a possibility to make this restriction more clear on your website? 

Our project fits to your mentioned requirements. The altitude over the surface is constant and the images are taken with the right angle, so that we have quasi-nadir-images of the slope. But we doesn't get a Orthophoto-like stitching with PTGui. The disstortions a to big for this special application and our needs.

Is there any possibility, that we withdraw our PTGui-licence yet, we got it just yesterday...? It would be very nice if you could accommodate us in this matter.

Or - just a thought - maybe we have another utilization for your software: For another project we need the possibility to align and crop 360-pictures via batch processing. 

The application would be the following: We have a few hundred 360-Photos from a 360-Camera. We have to change the nadir-point with the pitch-angle and crop the photos in all the same manner. Afterwards we want to stitch these new cylindrical panoramas together (as flat pics). 

Would this be possible with PTGui?

Thanks for your  understanding and patience!

Tilo Krippendorf

MIDIC GmbH

Halle, Germany

[PTGui Support]

Hi Tilo,

If the surface is absolutely flat, PTGui should be able to stitch the
images by following 6.4:

https://ptgui.com/support.html#6_4

If there's any elevation, it will not work. This is a physical
limitation of image stitching, not so much a limitation of PTGui. You
would need a different approach, by generating an actual 3d model. This
is called photogrammetry.

Not sure if I understand your other potential application. You could
extract rectilinear views from the panoramic images as shown in 6.26:
https://ptgui.com/support.html#6_26
and stitch those, again assuming the surface is absolutely flat.

Regarding returning your license please contact sup...@ptgui.com.

And I'd like to remind everyone that there's a free, fully functional
trial version!

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

On 22/09/2022 09:01, MIDIC GmbH wrote:
> Oh, that's bad.
>
> It wasn't clear, that PTGui isn't appropriate for rectilinear stitching
> of photos from different positions.  I have just read about this here on
> top of the forum ^ (after scrolling down accidently in the header
> section). Maybe it's a possibility to make this restriction more clear
> on your website?
>

> Screenshot 2022-09-22 080850.jpg
>
> Our project fits to your mentioned requirements. The altitude over the
> surface is constant and the images are taken with the right angle, so
> that we have quasi-nadir-images of the slope. But we doesn't get a
> Orthophoto-like stitching with PTGui. The disstortions a to big for this
> special application and our needs.
>
> Is there any possibility, that we withdraw our PTGui-licence yet, we got
> it just yesterday...? It would be very nice if you could accommodate us
> in this matter.
>
>

> *Or - just a thought - maybe we have another utilization for your
> software: *For another project we need the possibility to align and crop

> 360-pictures via batch processing.
>
>
> The application would be the following: We have a few hundred 360-Photos
> from a 360-Camera. We have to change the nadir-point with the
> pitch-angle and crop the photos in all the same manner. Afterwards we
> want to stitch these new cylindrical panoramas together (as flat pics).
>
> Would this be possible with PTGui?
>
>
> Thanks for your  understanding and patience!
>
> Tilo Krippendorf
>
> MIDIC GmbH
> Halle, Germany
> John Houghton schrieb am Mittwoch, 21. September 2022 um 21:35:15 UTC+2:
>
> Tilo, the short answer to your query is that PTGui is not designed
> to do this sort of stitching. All the photos should ideally be taken
> with the camera in a fixed position.  Mosaic stitching may be
> possible in some circumstances:  see FAQ:
> https://ptgui.com/support.html#6_4
> <https://ptgui.com/support.html#6_4> and 6_5.  It's not clear how
> the drone is moving in relation to the flat surface.  Is it flying
> at a constant altitude over the flat surface that slopes away below
> at an angle, or is it flying to maintain constant distance from the
> flat surface?
>
> John
> On Wednesday, September 21, 2022 at 7:55:49 PM UTC+1 MIDIC GmbH wrote:
>

> Screenshot 2022-09-21 125136.jpgHello PTGui support,

> i have a question regarding rectilinear gigapixel-panorama: The
> software seems to have issues to stitch photos of a big, flat,
> dipped surface. The camera-parameters  are allways changing
> after optimising.
>
>  I have about 900 pics in fullframe-format from a
> 35mm-objective. After optimising the project changes the
> parameters to fantasy values like 1500mm or something. I've
> tried to calculate the panorama row-wise - about 70 pics via the
> PTGui-Builder but that doesn't work properly.
>
> Do you have some hints for out project? The pictures are from a
> drone-mounted fullframe camera  with survey-grade GPS-EXIF-data.
> The overlap of the pictures is 80% sideways and frontal.
>
> Thanks a lot!
>
> Tilo Krippendorf
>
> MIDIC GmbH
> Halle, Germany
>
>

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