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

[Mike Chinander]

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
> http://www.kitware.com/opensource/opensource.html
>
> 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:
> http://www.itk.org/Wiki/ITK_FAQ
>
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