Unstictch/Unmap an image.....

[Zippy Tiff]

Hi

I have a flat 360 (well actually its a VR180) from a custom camera, which i would like to revert to the original spherical images, as the camera currently doesnt export raw or in original raw spheres..... any thoughts how/if i can do this with PTGUI and what would the the correct terminology ?

Thanks

[Erik Krause]

Am 09.09.25 um 12:36 schrieb Zippy Tiff:

> I have a flat 360 (well actually its a VR180) from a custom camera, which i
> would like to revert to the original spherical images, as the camera
> currently doesnt export raw or in original raw spheres..... any thoughts
> how/if i can do this with PTGUI and what would the the correct terminology ?

I assume it's a two fisheye camera, so the original images would be in
fisheye projection, not spherical. To extract two fisheye images from a
stitched equirectangular, choose eqirectangular as input projection and
fisheye as output. Then you can extract two fisheye images, which won't
be the original images, since during stitching some area in the overlap
got lost.

The image you showed is actually stitched from two times the same
fisheye image, but one is rotated by 90°, causing the horizon to appear
vertical. This can be remapped to one fisheye image, but since some
feathering appeared in the overlap, those regions are lost.

--
Erik Krause
http://www.erik-krause.de

[Zippy Tiff]

Thanks,

Yes, its a VR180 camera (with 1 lens rotated as you say), so same view with an IPD of 70mm between lenses

I will work through what you have said ;-)

Thank you for taking the time to guide me

Regards

[John Houghton]

You might find the attached project file useful.  If you are wanting stereo fisheye images, you would need to select that option for the output projection.

John

[Zippy Tiff]

Hi,

Thanks, your help is amazing !!

I think I see what you did, you essentially added the same image again, but using the mask feature to make 2 ‘views’, correct ?

How do I now select the output as fisheye ? this is where I am at the moment, I can take more care on the mask when I get closer

Regards

[Zippy Tiff]

Ah, found it, in Panorama Editor button.... lets me select Projection > Circular Fisheye

is that the right place to set it.... it seems to now export right....

[John Houghton]

On Tuesday, September 9, 2025 at 3:01:55 PM UTC+1 Zippy Tiff wrote:

I think I see what you did, you essentially added the same image again, but using the mask feature to make 2 ‘views’, correct ?

Yes, that's right.  Note that you should align the images with each other using control points only on the distant features, which are least affected by parallax.

John