[Rtk-users] More errors with 360 projections than 180 for SART

[Chao Wu]

Hi Anais,

I am travelling so I cannot review your images, but please check if the
following applies to you:
Open issue: https://github.com/SimonRit/RTK/issues/151
Related thread:
https://public.kitware.com/pipermail/rtk-users/2018-February/010575.html

Regards,
Chao

2018-04-11 15:37 GMT+02:00 <anais.capouillez at student.uliege.be>:

> Hi,
>
> I'm reconstructing a homogeneous cylinder. My problem is that I have
> better results for 180 projections, than for 360 for SART (with default
> parameters), and the same geometry (except the number of projections).
>
> I don't understand why adding projections adds more errors, since it
> should be better (and for other algorithms this is indeed better with 360
> projections).
>
> With 180 projections, the mean error on the cylinder is 1,6% , and the
> maximal error is 21,6%. While, with 360 projections, on the cylinder the
> mean error is 6,4%, and the maximal error is 169%.
> Even if I don't take into account voxels close to edges, there are more
> errors with 360 projections.
>
> Is there a reason why I obtain worse results with 360 projections?
>
> Since my files are too big, I added them here https://drive.google.com/
> drive/folders/1AYumjqNGUr8DZ0kxIbF7Ab1xet7srk-z?usp=sharing. I also added
> a file with the commands I used.
>
>
> Thank you very much.
>
> Anaïs
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