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Hi,

I would like to programme a panorama correction tool which is able to:

• align an existing panorama to a new vertical axis

• lower or lift the horizon

• shift the forward direction of the panorama (already solved with PIL [pillow] with picture shifting)

The input is an (all around = 360°) equirectangular panorama picture (2:1) as jpg file.
The output shall be the same panorama with corrected axis, corrected horizon and corrected forward direction in equirectangular format.

Analogue ot my current tool (Bildshifter) I would like to do the following:

• convert the equirectangular panorama picture to a small version for a faster preview

• show panorama picture (preview) in browser with javascript panorama viewer (PanoradoViewer.js)

• interactively change the vertical angle, horizontal line and forward direction line in browser

• take the values of Theta (angle of vertical [=upright] correction in starting view), Gamma (angle of horizon correction) and Phi (shifting angle for new fwd direction) and calculate a new
  equirectangular panorama in 3 steps:

1. correct vertical angle
2. correct horizon
3. shift fwd view position (picture shifting already coded)

I would use an interactive web page (with flask / flaskwebgui) with a javascript viewer (panorado) for the ineractive part (already working with picture shifting).
The small preview picture for the web page is created using PIL (pillow).
WiIth help of a suitable python library (not found yet) or directly with numpy (?) I would do the recalculation of the panorama itself.

Is there a good library for this kind of panorama recalculation?
Is there example code doing these operations (mainly step 1 and 2) on an equirectangular picture (not on a projected one) already existing?

I was inspired by a blog:
https://blogs.codingballad.com/unwrappi ... 09bd5bca94

I would be grateful for any help.


P.S. How do I add tags or metadata to this topic?