[Insight-users] about BSpline registration

[Luis Ibanez]

Hi Yixun,

The optimizer is definitely stopping too early.

Did you happen to feed the registration algorithm
with two identical input images  ?


Please let us know


   Thanks


       Luis


-----------------
Yixun Liu wrote:

>  Hi,
>  
>  I use BSpline transform to non-rigid registe two 3D images.   Both are 
> 256*256*46, unsigned char.
>  
>   Metric is MattesMI and Optimizer is LBFG. I set the parameter as below.
>  
>   optimizer->SetGradientConvergenceTolerance( 0.05 );
>   optimizer->SetLineSearchAccuracy( 0.9 );
>   optimizer->SetDefaultStepLength( 1.5 );
>   optimizer->TraceOn();
>   optimizer->SetMaximumNumberOfFunctionEvaluations( 1000 );
> the output is :
>  
> F = -0.376733, GNORM = 0.00103313
> *************************************************
>    I   NFN    FUNC        GNORM       STEPLENGTH
>    1    3        -0.388       0.001    4839.674
>  THE MINIMIZATION TERMINATED WITHOUT DETECTING ERRORS.
>  
> the steplength is so large, so I do not know if the result is correct.
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
> http://www.itk.org/mailman/listinfo/insight-users