hugin-devs team mailing list archive

[tmodes <1277770@xxxxxxxxxxxxxxxxxx>]

The optimization is done by libpano13 and not by Hugin itself. But even in libpano there is *no* outlier rejection. All control points are taken into account. Control points with very big error get only less weight than it would correspond to their error. Otherwise these single points would cause a lever action, which is unwanted. So I assume you have enough "good" control points and the problem is related to other problems like parallax errors. The preferred solution for such cases is to add more cp in the critical region and to reduce the number of cp in uncritical areas. 
Alternatively you can play with the Huber estimate parameter (in the pto file in the 'm line', the parameter named 'm', default is 2: "m m2".). You could try to increase the Huber estimator to give the cp with big errors more weight. But this is on your own risk and can have unwanted side effect.

** Changed in: hugin
       Status: New => Won't Fix

-- 
You received this bug notification because you are a member of Hugin
Developers, which is subscribed to Hugin.
https://bugs.launchpad.net/bugs/1277770

Title:
  Outlier rejection prevents accurate optimization

Status in Hugin - Panorama Tools GUI:
  Won't Fix

Bug description:
  I have been trying to stitch a 360 degree by ~40 degree panorama and
  it always has a stitching error somewhere around the circle.

  What seems to occur is it stitches everything around up until it finds
  that it went too far/not far enough, and then the last set of control
  point pairs then have a distance of hundreds of pixels, causing the
  algorithm to ignore them entirely. Even changing the optimization
  parameters to only allow changes to the misplaced photos in question
  doesn't work, because the control points still count as outliers and
  it does nothing.

  If possible, I'd like adjustable outlier rejection so that I could
  force the images into line. I ended up having to select the least-
  interesting part of the 360 degree circle and split the pano there by
  removing the control points.

  
  Operating System: Linux 3.11.0-15-generic x86_64
  Architecture: 64 bit
  Free memory: 8018064 kiB

  Hugin
  Version: 2013.0.0.76c3df493921
  Path to resources: /usr/share/hugin/xrc/
  Path to data: /usr/share/hugin/data/
  Path to user lensfun database: /home/carvac/.local/share/lensfun

  Libraries
  wxWidgets: 2.8.12.1
  libpano13: 2.9.18 
  Boost: 1.53.0
  Exiv2: 0.23.0
  Lensfun: 0.2.7.0

To manage notifications about this bug go to:
https://bugs.launchpad.net/hugin/+bug/1277770/+subscriptions