[Insight-users] LBFGSBoptimizer and MI value

[Serena Fabbri]

Hi All,

I am using DeformableRegistration8 with Mattes Mutual Information and LBFGSBoptimizer.
I'd like to know how the MI and the parameters change in each iteration. 
In the example, class CommandIterationUpdate is implemented  and I only add :

std::cout <<"Iter "<<optimizer->GetCurrentIteration() << "   ";
std::cout <<" Metric "<<optimizer->GetValue() << ":";
std::cout <<" Parameters "<<optimizer->GetCurrentPosition() << std::endl;

I use a Bspline-grid with 3 bound nodes and 3 node in the image and  I run fixed=MRI (176, 256, 
160) (1,1,1)mm   moving=CT (176, 256, 160) (1,1,1)mm

The code runs, I get a pretty good registered image but Metric value and parameters values are  
always 0.
could anybody point out me where the error is?
are the above instructions wrong?


Thanks.

Serena.