[ITK Community] [Insight-users] Misregistration output difference between ITK 4.2 and 4.4

[Mike Chinander]

Since you're on Linux, you can set the ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS
environment variable instead (no need to recompile). Just type the
following at the command line
export ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS=1


On Mon, Nov 18, 2013 at 8:14 AM, Mike Chinander <chinander at gmail.com> wrote:

> Do you still see a difference if you add: itk::MultiThreader::SetGlobalMaximumNumberOfThreads(
> 1 );
> to the beginning of the 4.4 version?
>
>
> On Mon, Nov 18, 2013 at 8:08 AM, Jagjeet Nain <jagjeet.nain at gmail.com>wrote:
>
>> Hi,
>> Here is similar plot but in this case Y axis represents mis-registration
>> between two images in Y direction.
>> Any idea or thoughts why the misregistration results are different in two
>> ITKs?
>> BR
>> Jagjeet
>>
>>
>> On Tue, Nov 12, 2013 at 5:05 PM, Jagjeet Nain <jagjeet.nain at gmail.com>wrote:
>>
>>> Hi Brad,
>>> Sorry, I should have explained this already.
>>> Y Axis is Misregistration between a pair of image in "X-direction". One
>>> point represents Mean of Misregistration in X-direction computed from ~150
>>> locations.
>>> X axis is time-series of image pairs.
>>> I could also send similar plot in Y direction, if you want.
>>> BR
>>> Jagjeet
>>>
>>>
>>> On Tue, Nov 12, 2013 at 2:51 PM, Bradley Lowekamp <brad at lowekamp.net>wrote:
>>>
>>>> Hello,
>>>>
>>>> What is the y-axis?
>>>>
>>>> Brad
>>>>
>>>> On Nov 12, 2013, at 8:45 AM, Jagjeet Nain <jagjeet.nain at gmail.com>
>>>> wrote:
>>>>
>>>>
>>>>
>>>>
>>>> Hi,
>>>> I was trying to run an Image Registration program which uses ITK's
>>>> Mattes Mutual Information method to compute misregistration between an
>>>> image pair and is based on ../Examples/Registration/ImageRegistration4.cxx
>>>> program.
>>>> Then I linked this program with two different ITKs (3.2 & 4.4) and
>>>> tried running two executable on ~200 image pairs to find misregistration
>>>> between each pair.
>>>>
>>>> I was expecting same output from two ITKs(running system is same, Linux
>>>> 32 in both case) but I am bit puzzled to see that there are misregistration
>>>> differences between two ITK versions, Also these differences are not
>>>> negligible they are of the order of 0.1m in a pixel of size 3m. Attached
>>>> are misregistration results from two ITKs.
>>>>
>>>> I guess somebody might have done similar comparison between different
>>>> ITK versions, what is their opinion? Are these differences expected?
>>>> If differences between two ITKs are expected, then which one is better
>>>> 3.2 or 4.4?
>>>> Thanks.
>>>> Any help or pointer in this respect is well appreciated.
>>>> BR
>>>> Jagjeet
>>>>
>>>> <MisregistrationDifference3.2Vs4.4.jpg>
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>>>
>>
>> _____________________________________
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>> Visit other Kitware open-source projects at
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>>
>> Kitware offers ITK Training Courses, for more information visit:
>> http://www.kitware.com/products/protraining.php
>>
>> Please keep messages on-topic and check the ITK FAQ at:
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