Stitching four 180 x 180 degree fish eye image

[DerekS]

Can anyone shed some light on how to stitch four 180 x 180 degree fish eye images into a 360 x 180 degree  equirectangular image?  

The images are fine, as I've been able to stitch them on a trial version of PTGui, but in Hugin 2019 the images when aligned are stacked upon each other as shown below.

Any idea where I'm going wrong?

Thanks

Derek

Images attached have been shrunk by 50% to reduce file size.  

[Gunter Königsmann]

That looks a bit like you have loaded the images but not yet have searched for control points or like you didn't optimize the right variables, afterwards which causes hugin to move the images to the right places. But I am not entirely sure...
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[Gunter Königsmann]

Or you might need a mask that excludes the black areas. Not that hugin tries to align the images in a way that makes the black areas match, instead of matching the image contents.

[Luís Henrique Camargo Quiroz]

   Exactly what Gunter said: go to the Masks tab (I am using the specialist interface), there you have two tabs below, for proper masks or for cut, choose cut ("cortar" in my Portuguese Hugin). In the screenshot you can see that, if you later move the "cut mask", dragging with the mouse, the black area or even the actual photo updates in the preview.

   I added automatic control points, optimized for positions, then decided to remove a few CPs in clouds, optimized again for positions and visualization, and got easily an equirectangular with your photos.

   Tell us if you have some problem with this. I think you you manage to build your panoramas without troubles!

   best regards,

   Luís Henrique

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Luis Henrique Camargo Quiroz
http://luishcq.br.tripod.com - http://www.christusrex.org/www2/cantgreg
http://panoramaslh.net/