[ITK-dev] [ITK] Potential BSpline registration problems with ITKv4

[Johnson, Hans J]

There was not supposed to be.  The intention was to do the minimal number of changes to allow the same results to occur in ITKv4 instead of ITKv3.  No new features or changes were specified.

Ali did this work, so he will need to double check, but upon quick review it looks like a simple refactoring from one framework to the other.

Hans


From: Nick Tustison <ntustison at gmail.com<mailto:ntustison at gmail.com>>
Date: Thursday, April 17, 2014 at 7:54 AM
To: Hans Johnson <hans-johnson at uiowa.edu<mailto:hans-johnson at uiowa.edu>>
Cc: ITK <insight-developers at itk.org<mailto:insight-developers at itk.org>>
Subject: Re: [ITK-dev] [ITK] Potential BSpline registration problems with ITKv4

Hans,

Are there any implementation differences between the two testing
programs, e.g. different metric class versions?

Thanks,
Nick

On Apr 17, 2014, at 8:24 AM, Bradley Lowekamp <blowekamp at mail.nih.gov<mailto:blowekamp at mail.nih.gov>> wrote:

Hans,



I have see a single per-pixel dynamic memory/malloc cause a 10X performance penalty.  Also I have found apple Instruments easy for diagnosing this bottle neck. This is one possibility among many.

Good luck tracking down the issue.

Brad

On Apr 16, 2014, at 9:10 PM, Johnson, Hans J <hans-johnson at uiowa.edu<mailto:hans-johnson at uiowa.edu>> wrote:

FYI

Ali Ghayoor did the following experiments on "BRAINSFitTest_BSplineScaleRotationRescaleHeadMasks" test.

1) In one of my old build directories, I ran the "BRAINSFitTest_BSplineScaleRotationRescaleHeadMasks" test in BRIANSFitv3 (that uses ITKv3 registration framework). The test was passed successfully in both release and debug types, and it took:

22 second in release
88 second in debug

2) I built NAMICExternalProject on my system in release type and ran the above BSpline test in BRAINSTools. The test was passed successfully again, but the run time in ITKv4 is tremendously longer than the time that test takes in ITKv3. The test took:

18 minutes using 4 cores
22 minutes using 1 core (In this case the environmental variable "NSLOTS" is set to 1).

==================================
Basically trying to replicate in ITKv4 the same registration processes of ITKv3.

Hans


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