hugin-devs team mailing list archive

[tmodes <1307457@xxxxxxxxxxxxxxxxxx>]

This was already discussed in the mailing list: Hugins definition of the
focal length refers to the undistorted image.

> One can easily test this by using different projections for the lens model.
This can not be calculated this way. The focal length is connected with the projection. A fisheye lens has a completely different focal length than a rectilinear lens of the same fov.

** Changed in: hugin
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1307457

Title:
  focal length as reported by the GUI incorrect

Status in Hugin - Panorama Tools GUI:
  Invalid

Bug description:
  The focal length as shown in the GUI is incorrect.  One has to
  multiply this values by (1-a-b-c) to get the proper focal length.
  This is because Hugin's distortion model scales the picture by this
  factor, thus affecting the resulting focal length.  See also the
  discussion at http://thread.gmane.org/gmane.comp.misc.ptx/34865

  One can easily test this by using different projections for the lens
  model.  This yields different values for the focal length.  However,
  multiplied by (1-a-b-c), the value is (within residual errors) the
  same.

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