Have you tried the combination of both? To be clear, --divisions acts on the reconstructed volume so it should be ~7 Go with the "--divisions 4" option (instead of 2000*2000*2000*4/1024/1024/1024=29.8 Go otherwise). The --lowmem option acts on the projections and you have 250 Mo (instead of 2048*2048*1500*4/1024/1024/1024=23.4 Go otherwise). The message "Failed to allocate memory for image" seems to be a CPU memory issue. Are you sure you have about 10 Go available to run this reconstruction?
On Tue, Feb 11, 2020 at 7:31 PM vincent <v...@xris.eu> wrote: > Hi Simon, > > I am afraid I forgot to mention something in my last email. I tried to > use the lowmem option, as you suggested a while ago in the list for the > same problem, but I am afraid I am still getting the same error. > > kind regards, > > Vincent > On 11.02.20 17:36, Simon Rit wrote: > > Hi Vincent, > There is a way to do such a thing in rtkfdk with the --divisions option, > see code here > <https://github.com/SimonRit/RTK/blob/master/applications/rtkfdk/rtkfdk.cxx#L190-L196>. > > I also don't really understand either what's going on in your bottom > reconstruction, it seems to be a geometric problem. Have you checked an > axial slice? > Simon > > On Tue, Feb 11, 2020 at 4:21 PM vincent <v...@xris.eu> wrote: > >> Hello RTK community, >> >> I am afraid that my question might not be directly related to the >> excellent implementation we are all using, but it might still be >> interesting for some of you. >> >> I have a stack of 1500 projections of size 2048*2048. I obviously can't >> reconstruct the full resolution volume on my graphics card, as it is too >> big. So my solution was to split the sinogram into N parts, for which >> each reconstructed volume would fit in my GPU memory and then reassemble >> them. I did a test with a 700*820*900 sinogram, that I cut in two parts >> of 700*410(+a small overlap)*900. >> >> While the reconstruction of the whole volume was acceptable, I got a >> weird issue with the split ones: the one corresponding to the top of the >> image is also ok, but the bottom one is very blurry. The three images >> can be found at the following links: >> >> https://ibb.co/vLk9ZhQ >> https://ibb.co/m4pm0LT >> https://ibb.co/Jyf1yKM >> >> I used the same calibration parameters for the three reconstruction. I >> visually checked the split sinograms and they looked fine. >> >> >> Any insight will be much appreciated ! >> >> >> Thanks in advance, >> >> kindest regards, >> >> Vincent >> >> _______________________________________________ >> Rtk-users mailing list >> Rtk-users@public.kitware.com >> https://public.kitware.com/mailman/listinfo/rtk-users >> >> _______________________________________________ > Rtk-users mailing list > Rtk-users@public.kitware.com > https://public.kitware.com/mailman/listinfo/rtk-users >
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