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Re: [PanoToolsNG] Re: How constant are a,b,c,d,e for a lens?

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  • paul womack
    ... Interesting. I have done this once. If/when I do another, I will compare the a,b,c with interest. ... Fair enough. BugBear
    Message 1 of 10 , Oct 19, 2007
      John Houghton wrote:
      > --- In PanoToolsNG@yahoogroups.com, paul womack <pwomack@...> wrote:
      >> Is my camera a bit loose, or am I doing something wrong,
      >> or are my expectations wrong?
      >
      > You cannot expect uniform optimization results using handheld shots.
      > There is always the likelyhood of parallax problems, unless
      > everything in view is very far away. You end up with the optimizer
      > trying to fix parallax errors by distorting the images with
      > inappropriate lens parameters. For your calibration test, you would
      > do better to take a full 360 degree panorama, having the camera on
      > the head with the entrance pupil accurately positioned at the no
      > parallax point. Include some 50% overlaps. Careful control point
      > placement and optimization should ensure a good result.

      Interesting. I have done this once.

      If/when I do another, I will compare the a,b,c with interest.

      >
      > However, when using the calibrated lens parameters in a heandheld
      > camera project, don't expect an excellent optimization report. That
      > would be unrealistic. Place control points on distant features only,
      > and the optimizer should align those very well. But expect to see
      > some stitching errors on nearer features - they are inevitable.

      Fair enough.

      BugBear
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