Re: [hugin-ptx] Re: No succes stitch spherical pano from Meike 6.5 mm circular fisheye.

[Greg 'groggy' Lehey]

On Monday,  5 October 2020 at 14:21:34 -0700, Henk Tijdink wrote:
> Hello Thomas
>
> Removing the control points in the Nadir did the job.

Did you read my reply?  For me it worked out of the box, and produced
better results than you attach.  See
http://www.lemis.com/grog/photos/Photos.php?dirdate=20201002

> But when I see the result in the preview screen you think it goes wrong.
> You see a lot of sawteeth in the preview.

Yes, as I said.  It's an issue with the *fast* preview screen.  The
normal preview works.

Greg
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[hugin-ptx] Re: No succes stitch spherical pano from Meike 6.5 mm circular fisheye.

[T. Modes]

Hi Henk,

Am Donnerstag, 1. Oktober 2020 16:33:02 UTC+2 schrieb Henk Tijdink:
>
>
> In PTGUI is the lens in te database.
> It gives the following values for the Meike lens. This for the Jpeg files 
> from the camera
> F  theoretic  6,5 mm After optimizing are the 
> lens parameters
> Practical  6,66 mm   a= -0,093   and 
> sensor shift.
> Fov degrees 181,01   b=  0,18  d= 
> -0,18%
> Fisheye factor-0,824152 c= -0,11   e= 
> -0,17%
>
 

>
> Is it possible to "translate" the lens parameters of this from the PTGUI 
> database to hugin? 
>

This is not so easy. PTGUI fisheye factor does not translate 1:1 to a 
projection of libpano. The fisheye factor of -0.824 would result in 
something between orthographic and equisolid projection (see 
https://wiki.panotools.org/Fisheye_Projection).
The next pitfall is the fov: PTGUI calculates the fov to the cropped 
circle, libpano/Hugin is using the horizontal dimension of the full image 
(see https://wiki.panotools.org/Panotools_internals#Cropping ). 

I had a look at your pto file. If I remove the control points in the nadir 
area it optimizes nicely. Without the images it is difficult to give 
further advices, but I would check the control points in the nadir area 
(maybe some repetitive pattern has confused the control point finder) and 
then try again.

Thomas

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