[Insight-users] Residual error when using ImageRegistration1 ?

[Daouk Joël]

Hi every-body,
 
I am a newbie in ITK and I tried to use the ImageRegistration1.cxx with 2 (very) simple images. The fixed image was a 168x168 null image (pixel spacing = 1.0 and element size = 1.0) where I drew a centered filled square (pixel value = 35). The moving image was the same image with a simple translation of the square (dx = 10, dy = 5 pixels). When using ImageRegistration1 (MaximumStepLenght = 4.0, MinimumStepLenght=0.01, MaximizeOff, NumberOfIterations=200, MinimizeOn) with these data, the algorithm stops after only 17 iterations and gives translation parameters equal to dx=10.0000014214 dy=4.999978 and a final final non-equal to 0 (around 3e-9). Why ImageRegistration1 can not find the real solution on a so simple test data set ?
Thanks in advance.
 
Cheers
 
Joël DAOUK
 
Unité TEP
CHU Amiens hôpital Sud
Avenue Laennec
80480 Salouel
 
Tel : +33 3 22 45 60 15
 
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