[ITK] [ITK-users] SimpleITK and R demons_registration problem

[Lowekamp, Bradley (NIH/NLM/LHC) [C]]

Have you tried casting to sitkFloat64?

> On Aug 18, 2017, at 12:49 PM, FWagner <wagner.h.fabien at gmail.com> wrote:
> 
> Hi,
> I have some trouble using the demons_registration from
> https://insightsoftwareconsortium.github.io/SimpleITK-Notebooks/R_html/66_Registration_Demons.html
> I have tested the example and it work well. however when i used the function 
> demons_registration with two image .png that i have generated i have some
> strange errors. See the R code and the error below 
> 
> # generate two image of a square slighty differents
> library(raster)
> library(imager)
> r=raster(ncol=600,nrow=600)
> r=setValues(r,1)
> im1=as.cimg(r)
> im1[200:300,200:300]=0
> plot(im1)
> 
> im2=as.cimg(r)
> im2[210:320,210:320]=0
> plot(im2)
> 
> save.image(im1,"square1.png")
> save.image(im2,"square2.png")
> 
> library(SimpleITK)
> 
> cntrl <- ReadImage("square1.png")
> img1 = Cast(cntrl,"sitkFloat32")
> img1
> 
> cntrl <- ReadImage("square2.png")
> img2 = Cast(cntrl,"sitkFloat32")
> img2
> 
> # the demons_registration function can be downloaded here :
> https://insightsoftwareconsortium.github.io/SimpleITK-Notebooks/R_html/66_Registration_Demons.html
> 
> tx <- demons_registration(fixed_image = img1, moving_image = img2)
> Show Traceback
> 
> Rerun with Debug
> Error in f(...) : Exception in SITK - check warning messages In addition:
> Warning message:
> In f(...) :
>  Exception thrown in SimpleITK TransformToDisplacementFieldFilter_Execute:
> /tmp/RtmpE4PobR/devtools25774a9d4940/SimpleITK-SimpleITKRInstaller-5f821a0/SITK/Build/SimpleITK-build/Code/BasicFilters/src/sitkTransformToDisplacementFieldFilter.cxx:178:
> sitk::ERROR: Unexpected error converting transform! Possible miss matching
> dimensions!
> 
> 
> Does anyone have an idea of the problem ?
> 
> Thank you very much,
> 
> 
> Fabien
> 
> 
> 
> 
> --
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