On Wednesday, August 29, 2018 at 10:02:37 PM UTC+1, Phanto B wrote:

>
> @ panostar: you mentionned "good set of lens parameters from a previous 
> similar stitch". Can you please explain ?
>

The lens distortion correction parameters (Hfov,a,b,c,d,e) are 
characteristic of the lens (at a particular focus/zoom setting) and 
shouldn't change significantly from run to run.  So if these have been 
evaluated by the optimizer in a similar (successful) previous run, you can 
use them in a similar subsequent run and so relieve the optimizer of this 
job.  You then need considerably fewer control points. All you need do is 
enter the parameters on the lens panel and then elect not to include these 
parameters in the optimization.  For a full 360 panorama, you can optimize 
hfov to fine tune it so that the images exactly fit around the spherical 
stitching surface.

John

<https://groups.google.com/group/hugin-ptx/attach/15828cff377e09/Sans%20titre.png?part=0.1&authuser=0>

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