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I'm actually about to embark on exactly such a project. My plan is to use OpenCV's "stitching_detailed.cpp" example, and improve it from there. OpenCV's stitching is quite good out of the box, but I think I can improve it by adding knowledge from the phone's IMU. What do you need this for?

> My plan is to use OpenCV's "stitching_detailed.cpp" example

Has you seen next project?[0]

[0] https://github.com/acodexm/Panorama360

I don't know specifically about Android but Dermandar[1] have an SDK which claims Android compatibility (I use their iOS app which takes horizontal panoramas as the phone rotates.)

Also have a 360 solution SDK[2].

[1] http://www.dermandar.com [2] https://thevrkit.com/sdk/

Oh wow, that's an expensive option.

> Google does with PhotoSphere

What about Sprayscape?[0]

https://github.com/googlecreativelab/sprayscape

That looks decent. However it seems abandoned and some of the dependencies also seem to have fallen to link rot.