[Insight-users] Registration / affineTransform / translation problem

[Luis Ibanez]

Hi Yoann,
1) Are you using the CenteredTransformInitializer ?

2) What are the sizes (in pixels along each dimension) of
    your Fixed and Moving images ?

3) What are the pixel spacings of your two images ?

4) What are the origins of your two images ?

5) What exact values are you using in the optimizer scales array ?


Please let us know,


    Thanks


         Luis


--------------------------
On Mon, Aug 17, 2009 at 10:26 AM, Yoann Moreau <yoann.moreau at gmail.com>wrote:

>  Hey everyones !
>
> I have a problem with ImageRegistration :
>
> I'm trying to register images (a  Fixed image and a Moving one (same image
> but which I applied to a scaling, translation and rotation transform).
>
> I 've obtain excellent results when I applied only a rotation and a
> scalling transformation.I based my code on ImageRegistration9.cxx and use a
> an AffinTransform based on MatesMultualInformation for the metric,
>  RegularStepGradientDescentOptimizer for the optimizer.
>
> Therefore as soon as I applied a translation Translation in X, Y,
> translation factors are still very low ( near to 0) and results for other
> factors determination tion are worse.
>
> I supposed the problem come from Optimizer Scales and more precisely  from
> adjustment of TranslationFactors towards rotation and scaling factor.
> I try recommandation "to use a factor proportional to the diagonal length
> of the image", Therefore I'm working on Satellite images with a resolution
> of 10 m by pixel.
> Resultts using that estimation are worse. Have you got an idea of how I can
> solve my problem with translation factors determination ?
>
>
>
> reference :
>  http://public.kitware.com/pipermail/insight-users/2004-July/009558.html
>
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