[Insight-users] Evolutinary Optimizer

[Karthik Krishnan]

Bad choice of parameters. You should try to use the default parameters 
for the Evolutionary optimizer, they work well.

The initial search radius you've specified for the optimizer is 10, that 
would be the initial search radius the optimizer throws samples on and 
it might just be too large. One of those points could end up with a 
transform that gave you very little overlap between the fixed and moving 
images. The default is 1.01.


Jonathan Wong wrote:

> Hi
>
> I currently modified my the MultiResMIRRegistration example and have 
> gotten it to compile by simply changing the optimizer from Quaternion 
> to the OnePlusOneEvolutionary optimizer.
>
> I used the default settings everyone seems to be using.
>
>   m_Optimizer->Initialize( 10,1,-1 );
>   m_Optimizer->SetEpsilon( 1.0 );
>   m_Optimizer->SetMaximumIteration( 4000 );
>
>
> and i checked my scales, where the translation scale is 16mm, since my 
> image is 263 with a pixel size of 0.062 mm.
>
> I keep on getting the famous "all the sampled point mapped to the 
> outside o the moving image" error.
>
> I've been reading similar posts on the mailing list, and they always 
> talk about setting the radius, shrink, and grow parameters as well as 
> scaling.
>
> However, I wanted to know what Epislon is for? Thanks.
>
> Jonathan Wong
>
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