[Insight-users] Problem with MultiResMIRegistration

[Vicente Grau]

Hi Fong Ming,

I have a similar problem, and in my case it's just that the Mutual 
Information Metric does not work. Can you try the Testing programs that 
use Mutual Information? For example, in program itkAlgorithmsTest, 
select test number 55 or 67. These tests don't work for me.
I haven't been able to solve the problem, but in my case I am just using 
another metric and it is fine.

Vicente

Fong Ming Hooi wrote:

> Hello,
>
> I’m having some trouble with the MultiResMIRegistration program. I’m 
> using the input of BrainWebT1toT2b.txt and have been getting this 
> corresponding output:
>
> Output:
>
> Parsing input ...
>
> Fixed image filename: 
> C:\ITKFiles\ITKAppBin2\MultiResMIRegistration\brainweb165a10f17.mha
>
> Moving image filename: 
> C:\ITKFiles\ITKAppBin2\MultiResMIRegistration\brainweb1e5a10f17Rot10Tx15.mha 
>
>
> Permute order: [0, 1, 2]
>
> Flip axes: [0, 0, 0]
>
> Number of levels: 5
>
> Fixed image shrink factors: [4, 4, 1]
>
> Moving image shrink factors: [8, 8, 1]
>
> Number of iterations: [2500, 2500, 2500, 2500, 2500]
>
> Learning rates: [0.0001, 1e-05, 5e-06, 1e-06, 5e-07]
>
> Translation scale: 320
>
> Output filename: t1tot2.mhd
>
> Preprocess the images ...
>
> Register the images ...
>
> --- Starting level 0
>
> No. Iterations: 2500 Learning rate: 0.0001
>
> --- Starting level 1
>
> No. Iterations: 2500 Learning rate: 1e-05
>
> --- Starting level 2
>
> No. Iterations: 2500 Learning rate: 5e-06
>
> --- Starting level 3
>
> No. Iterations: 2500 Learning rate: 1e-06
>
> --- Starting level 4
>
> No. Iterations: 2500 Learning rate: 5e-07
>
> Final parameters: [0, 0, 0, 1, 0, 0, 0]
>
> Overall transform matrix:
>
> 1 0 0
>
> 0 1 0
>
> 0 0 1
>
> Overall transform offset:
>
> [0, 0, 0]
>
> Generating output ...
>
> The output image is unchanged from the moving image. Does anyone have 
> any advice as to what I can do to troubleshoot this? I’ve built the 
> ITK 1.8 framework using cygwin along with FLTK 1.1.4 and Qt 2.3.1 as 
> well. Also, the Hello World example works fine along with the 
> Registration examples.
>
> Thanks,
>
> Fong Ming
>
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