[ITK] [ITK-users] PowellOptimizerv4 does not run CommandIterationUpdate Execute() method

Thu Jan 5 09:21:39 EST 2017

Hello,

I have some SimpleITK tests which do verify that this optimizer does produce the “iteration event”.

I don’t recall the details of this optimizer, but I think it does a complex update step and may not report the event if it terminates early. I suspect there is a problem with how the registration problem is setup which causes the optimizer not  work and not a problem with the ITK code.

What is the “stop condition description”?

Brad

On Jan 4, 2017, at 3:41 PM, Andrew Harris <aharr8 at uwo.ca<mailto:aharr8 at uwo.ca>> wrote:

Hi, hope someone can help direct me to a reference.
I have been trying to use the PowellOptimizerv4 to do an automated image alignment between two 3D ultrasound images.  We are using Mutual Information as a metric and it is exiting at -0.30 for images with a high degree of overlap, but when I use CommandIterationUpdate to try and see how the optimizer is behaving the Execute() method doesn't run.  It is identical to the code copied from ITK examples that ran when I was using the LBFGS optimizer, with the exception that I've added a few print statements to see whether one of the if statements was being activated prior to the output.

Let me know if you have any suggestions, thanks.

--

AH

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