[Insight-users] Criterion to stop 1+1_evolutionary optimizer?

[Li, George (NIH/NCI)]

Hi, Luis and all itk users:

I have found the multi-resolution samples. So, I am
Now upgrading my registration program for a better and
More attractive performance.

For OnePlusOneOptimizer, The growth factor seems to be 
A suitable variable to control the fitting speed for 
Each pyramid. However, how to set a stopping criterion 
Seems unclear to me.

Anyone has experience or idea on this matter?

Thanks,

George



-----Original Message-----
From: Li, George (NIH/NCI) 
Sent: Tuesday, March 15, 2005 12:28 PM
To: Li, George (NIH/NCI); 'Luis Ibanez'
Cc: Insight-users at itk.org
Subject: Registration performance


Hi, Luis:

Sometime ago, you commented on improving performance
As the following. I now understand what you meant by Multi-resolution.
However, is there any sample code For its implementation?

>Trivial answer to your question about performance:
>
>             The way to improve performance
>              is to use multi-resolution.
>
>You can register volumes of size 200x200x200 pixels
>in about 20 seconds when using 3 levels of a multi-
>resolution pyramid, by subsampling by 2 at each level, 
>in a typical Pentium 4 machine at 2Ghz, and 512Mb of 
>memory.

Now, it seems that the registration performance has
Become a big issue to me, and some 20 seconds for a 
Registration is much attractive, comparing with a few 
minutes.

So, could you further provide some guidance on it?

Thanks,

George