[Rtk-users] 答复: 答复: Rtk Detector Displacemets

[Simon Rit]

Hi,
First, I'm not sure I understand why you modified rtkfdk, the command 
line options would have allowed you to do all the modifications I think 
without changing the code. I'm not going to debug your piece of code...
Regarding the geometry, this is clearly a difficult step but that's your 
job to understand how to translate your geometry parameters to RTK 
geometry using the document on the wiki.
Good luck!
Simon

On 30/12/2015 07:54, Freyman li wrote:
>
> Dear Simon,
>
> Thanks for your reply for my question!
>
> I solved this problem under your reminding and there is no longer 
> display the error message.
>
> I set the origin point as (-0.5*0.254*767,-0.5*0.254*959) to make the 
> origin coordinate at the center of the projection.
>
> Also, I adjust the geometry calibration to fit your projection model 
> but still can’t acquire the right image with my projection data.
>
> I attached my key code(just the version overwrite rtkfdk.cxx)and hope 
> that you can give me some advice.
>
> Freyman li
>
> *发 件人:*simon.rit at gmail.com [mailto:simon.rit at gmail.com] *代 表 
> *Simon Rit
> *发 送时间:*2015年12月29日6:26
> *收件人:*Freyman li
> *抄送:*louie L; rtk-users at public.kitware.com
> *主题:*Re: [Rtk-users] 答复: Rtk Detector Displacemets
>
> Dear Freyman li,
>
> Have you solved your problem ? If not, my guess would be that you have 
> not set the origin of your projections correctly. Where does your 
> calibration assume the location of point (0,0) in your projections? 
> Since you have very small X projection offsets, it probably assumes 
> that it's at the center of the projection so you must set the origin, 
> i.e., the coordinate of the first pixel, at (0.5*0.254*767, 
> 0.5*0.254*959). If you don't do that, rtkfdk detects a large offset 
> that it cannot correct for.
>
> Simon
>
> On Mon, Dec 14, 2015 at 6:32 AM, Freyman li <lihanwei_1500 at 126.com 
> <mailto:lihanwei_1500 at 126.com>> wrote:
>
>     Thanks for your help! I attached the geometry settings to this
>     email. And my detector size is 768*960 with a pixel size 0.254mm.
>
>     *发 件人**:*louie L [mailto:ghostcz at hotmail.com
>     <mailto:ghostcz at hotmail.com>]
>     *发送时间**:*2015年12月14日11:38
>     *收件人**:*Freyman li; rtk-users at public.kitware.com
>     <mailto:rtk-users at public.kitware.com>
>     *主题**:*RE: [Rtk-users] Rtk Detector Displacemets
>
>     Sent from Mail <http://go.microsoft.com/fwlink/?LinkId=550986> for
>     Windows 10
>
>
>     *From: *louie L <mailto:ghostcz at hotmail.com>
>     *Sent: *Monday, December 14, 2015 04:38
>     *To: *Freyman li <mailto:lihanwei_1500 at 126.com>
>     *Subject: *RE: [Rtk-users] Rtk Detector Displacemets
>
>     Hi,
>
>     Can you post your geometry file to the mail list? Your problem
>     sounds like a result of wrong geometry settings.
>
>     Best regards,
>
>     Louie
>
>     Sent from Mail <http://go.microsoft.com/fwlink/?LinkId=550986> for
>     Windows 10
>
>
>     *From: *Freyman li <mailto:lihanwei_1500 at 126.com>
>     *Sent: *Monday, December 14, 2015 04:25
>     *To: *Rtk-users at public.kitware.com
>     <mailto:Rtk-users at public.kitware.com>
>     *Cc: *rtk-users at openrtk.org <mailto:rtk-users at openrtk.org>
>     *Subject: *[Rtk-users] Rtk Detector Displacemets
>
>     Dear rtk-users,
>
>     I have generated the geometry XML file by using the geometry
>     calibration in my CBCT system. And I want to reconstruct the
>     volume from 360 raw projections data.
>
>     But after running the rtkfdk.cxx, I get an output message that
>     "Cannot account for too large detector displacements, a part of
>     space must be covered by all projections."
>
>     And I try to use the addprojection function to generate a simple
>     geometry structure using only SID and SDD, this problem did not
>     happen but the reconstruction result is not correct.
>
>     How can I solve this problem? Is there any limitation about the
>     detector weighting?
>
>     I really appreciate any help you can provide.
>
>     With regards,
>
>     Freyman li
>
>
>     _______________________________________________
>     Rtk-users mailing list
>     Rtk-users at public.kitware.com <mailto:Rtk-users at public.kitware.com>
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>

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