stitching wide images - crroked vs straight

[Jann Lipka]

I'm trying to get a grip on this ,
When stitching  let say 5 images from 35 mm Hasselblad :
every single image has all lines straight .
When I stitch ( on panorama head , with proper nodal point etc )
when stitching 2 images - I get  a FOV of around 70x90 degrees and it still looks straight .
/ rectilinear / when stitching more image like three  ( 70x120 degrees )
the view is cylindrical and horizontal lines ( except in the middle are curved )
when I  force the view to rectilinear - what I get is severely stretched image at the edges .
I understand this is not due to my software .

Is it possible to get 120  or more degrees without " stretching " or " curving "
and get image that looks like my perception ( correct perspective )


See attached screenshot .
I understand that one shot images with rectilinear lenses and stitched shift lenses will make straight images , but is it possible to get more then 120 degress ?

[ErikKaffehr]

Hi!

In short no.

A longer answer is that objects seen at large angles are farther away. They can be mapped either with cylindrical/spherical perspective (angle is kept) or rectiliniear perspective. Rectilinear perspective forces the objects to be enlarged thus causing the stretching. Same would apply to any (non fisheye) lens, try to put a head of a person in one of the corners of a ultra wide picture and see what happens.

Best regards

Erik

I'm trying to get a grip on this ,
When stitching  let say 5 images from 35 mm Hasselblad :
every single image has all lines straight .
When I stitch ( on panorama head , with proper nodal point etc )
when stitching 2 images - I get  a FOV of around 70x90 degrees and it still looks straight .
/ rectilinear / when stitching more image like three  ( 70x120 degrees )
the view is cylindrical and horizontal lines ( except in the middle are curved )
when I  force the view to rectilinear - what I get is severely stretched image at the edges .
I understand this is not due to my software .

Is it possible to get 120  or more degrees without " stretching " or " curving "
and get image that looks like my perception ( correct perspective )
See attached screenshot .
I understand that one shot images with rectilinear lenses and stitched shift lenses will make straight images , but is it possible to get more then 120 degress ?


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[wmchauncey]

I cannot directly answer you question, but there is a program out there that allows you to take numerous images, merge them.  The program gives you an image 360 degrees in all directions, and you end up with a feeling that you're inside a globe.
Do a google on panarama.