← Back to team overview

hugin-devs team mailing list archive

[Bug 1838386] Re: Add Mollweide projection

 

** Attachment added: "Hammer projection"
   https://bugs.launchpad.net/hugin/+bug/1838386/+attachment/5280024/+files/hammer.jpg

** Description changed:

  For a project I'm working on it would be very useful to have the
  Mollweide projection
  (https://en.wikipedia.org/wiki/Mollweide_projection) implemented in
  Hugin (panotools). This projection looks quite similar to the hammer-
  aitoff one but parallels do indeed look parallel. In fact mathematically
  is very very similar to the equirectangular one but taking into account
  the real "width" or "length" of the parallels. In fact this projection
  can be achieved from a equirectangular one just "contracting" every row
- of pixels in the image to a size of widthRow * cos(altitude).
+ of pixels in the image to a size of widthRow * sqrt(cos(altitude)).
  
  One of the advantages of this projection from the hammer-aitoff one is
  that has less "visual distortion" near the equator.
  
  Would it be possible to implement this projection? Any hints on how
  could I implement this? I've taken a look on the source code of
  panotools, but it is big and I don't find the exact place where to look
  for the equirrectangular projection (in which the code could be easily
  adapted I think).
  
+ Below I attach the same image with Hammer projection and a "hand made
+ mollweide" from the equirectangular one.
+ 
  Thanks for your attention

-- 
You received this bug notification because you are a member of Hugin
Developers, which is subscribed to Hugin.
https://bugs.launchpad.net/bugs/1838386

Title:
  Add Mollweide projection

Status in Hugin:
  New

Bug description:
  For a project I'm working on it would be very useful to have the
  Mollweide projection
  (https://en.wikipedia.org/wiki/Mollweide_projection) implemented in
  Hugin (panotools). This projection looks quite similar to the hammer-
  aitoff one but parallels do indeed look parallel. In fact
  mathematically is very very similar to the equirectangular one but
  taking into account the real "width" or "length" of the parallels. In
  fact this projection can be achieved from a equirectangular one just
  "contracting" every row of pixels in the image to a size of widthRow *
  sqrt(cos(altitude)).

  One of the advantages of this projection from the hammer-aitoff one is
  that has less "visual distortion" near the equator.

  Would it be possible to implement this projection? Any hints on how
  could I implement this? I've taken a look on the source code of
  panotools, but it is big and I don't find the exact place where to
  look for the equirrectangular projection (in which the code could be
  easily adapted I think).

  Below I attach the same image with Hammer projection and a "hand made
  mollweide" from the equirectangular one.

  Thanks for your attention

To manage notifications about this bug go to:
https://bugs.launchpad.net/hugin/+bug/1838386/+subscriptions


References