[Rtk-users] [EXTERNAL] Re: Compensation for object rotation off center

[Eldridge, Bryce Duncan]

Thank you, by manually adjusting the horizontal offset I was able to get this reconstruction to look a lot better, I will look more into various calibration procedures for this in the future.

From: Simon Rit <simon.rit at creatis.insa-lyon.fr>
Sent: Thursday, November 16, 2023 11:35 PM
To: Eldridge, Bryce Duncan <bdeldri at sandia.gov>
Cc: rtk-users at openrtk.org
Subject: [EXTERNAL] Re: [Rtk-users] Compensation for object rotation off center

Hi,
You need to adjust the geometry which is described here<http://www.openrtk.org/Doxygen/DocGeo3D.html>. One of the most sensitive parameters is probably DetectorOffsetX.
Adjusting these parameters requires a calibration procedure (see e.g. doi.org/10.1088/0031-9155/45/11/327<http://doi.org/10.1088/0031-9155/45/11/327>) or an auto calibration method (e.g. doi.org/10.1109/TRPMS.2017.2734844<http://doi.org/10.1109/TRPMS.2017.2734844>).
Simon

On Fri, Nov 17, 2023 at 12:01 AM Eldridge, Bryce Duncan <bdeldri at sandia.gov<mailto:bdeldri at sandia.gov>> wrote:
I am trying to create a 3D reconstruction using data captured with a rotating turntable, and everything is working mostly correctly.

However, the object is not exactly centered on the vertical rotational axis of the table so the reconstruction does not look quite right, some features are sort of blurred/smeared since they are moving in a circle.

Is there some way to account for the object being off-center using RTK? I have looked some in the documentation and examples but didn’t find anything that looked like what I need, if someone can point me in the right direction I would appreciate it. Possibly in the projection geometry, but is there also a way to determine this offset from the projection images themselves?


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