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Documentation

Algorithm

Ver0.1 - use the "convert to polar coordinates" technique as in https://hnsws.blogspot.com/2011/08/viewing-panoramas-on-fulldome-simple.html

Ver0.2 - use the "equirect to fulldome" technique as in OCVWarp - https://github.com/hn-88/OCVWarp

Ver1.0 - also uses the "equirect to fulldome" technique as above.

References

On creating gradients and fades in OpenCV -

https://stackoverflow.com/questions/58444510/creating-a-linear-gradient-mask-using-opencv-or

Sources for panoramic images -

https://commons.wikimedia.org/wiki/Category:360%C2%B0_panoramas

https://srisathyasaispacetheatre.blogspot.com/2022/12/panoramic-views-prasanthi-nilayam.html

https://blogs.ntu.edu.sg/openimagecollections/project_tag/landscapes-environments/

via https://bard.google.com

https://www.rawpixel.com/search?page=1&similar=3311325&sort=curated&topic_group=_topics

Enhancements would be

1. fill the "sky" with gradient to darker colour,
2. fade left and right edges to darker colour if original pan is not 360 degrees
3. option to mirror the pan if original spans 180 degrees, to make it 360.