Needs to be fixed in libpano13
** Changed in: hugin
Status: New => Triaged
** Also affects: panotools
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/791473
Title:
reverse transform of (0,0) yields nan with a,b, or c != 0
Status in Hugin - Panorama Tools GUI:
Triaged
Status in Panorama Tools:
New
Bug description:
Hi all!
I've stumbled upon a strange bug while using hsi, but I think it's not
an hsi bug. If I have an image in a pto which has lens correction
coefficients differnt from zero and try to reverse-transform image
coordinates to pano coordinates, this produces (nan, nan) as output
for the image origin. All other coordinate values seem to work just
fine, and if the lens correction coefficients are all zero, the origin
transforms correctly as well. A very small value for a, b or c will
suffice to produce the bug.
I failed to produce the bug using pano-trafo with coordinates of the
image center, but then the transform never came out precisely at the
pano center, either, so maybe I just didn't manage to find the proper
parameters. I suspect the bug may be in hugin's wrapping code where
the transformations are made into objects and the shift to image-
center = 0,0 is made, and I'm half certain it wasn't there a few
months ago.
my system info is
Betriebssystem: Linux 2.6.38-8-generic-tuxonice i686
Architektur: 32 bit
Freier Speicher: -1831376 kiB [sic]
Hugin
Version: Pre-Release 2011.1.0.b1083a690f94
Ressourcen-Pfad: /usr/local/share/hugin/xrc/
Datenpfad: /usr/local/share/hugin/data/
hugin is self-built - obviously with BUILD_HSI=ON.
Find attached a compressed tar file with a pto, an image and a python
script which I used to produce the error. I got this output on my
machine:
>python sad.py
image 0: ( 0.000001 , 0.000001 ) -> ( 0.000001 , 0.000001 ) success = True
image 1: ( 0.000001 , 0.000001 ) -> ( 0.000001 , 0.000001 ) success = True
image 0: ( 0.000000 , 0.000000 ) -> ( 0.000000 , 0.000000 ) success = True
image 1: ( 0.000000 , 0.000000 ) -> ( nan , nan ) success = True
Kay
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