[Insight-users] Mutual Information Error

[Jordan Soet]

Actually, I was just trying some things out still after my last e-mail, 
and even when using the same image for both the fixed and moving images 
I still get the same exception thrown, with 0/10000 samples matching. 
This just seems wrong to me, even if my image data is a little wrong. 
Could this still be caused by that or am I possibly doing something else 
wrong?

Thanks,
Jordan


p.s. I also found a tiny stupid bug in ImageRegistration11... At the 
beginning when it checks the number of arguments it allows only 3, when 
really it should be 4 (it's also in ImageRegistration10). I'm sure you 
have better things to do, but at least now you know.


Luis Ibanez wrote:

>
> Hi Jordan,
>
>
> This message is typically produced when the Transform is such that
> the Moving image is mapped outside the extent of the Fixed image.
>
> The lack of overlap between the Fixed image and the mapped Moving
> image makes impossible to compute the Metric, and therefore an
> Exception is thrown.
>
>
> Please post to the list the characteristics of your two images.
>
>      - Number of pixels along each dimension
>      - Pixel spacing
>      - Origin
>
>
>
> You can get spacing and origing very easily by just invoking
>
>
>      fixedImageReader->GetOutput()->Print( std::cout );
>      movingImageReader->GetOutput()->Print( std::cout );
>
>    [after having invoked the Update() methods of the readers]
>
>
>
>
> It is very likely that the origin of your images is such that
> initializing the Transform as an Identity is not appropriate.
>
>
>
> In that case, you may want to use the Transform Initializer, as
> illustrated in the ITK Software Guide
>
>
>          http://www.itk.org/ItkSoftwareGuide.pdf
>
>
> Chapter 8,
>
>
>
>    Regards,
>
>
>
>        Luis
>
>
>
> --------------------------
> Jordan Soet wrote:
>
>> I'm working the mutual information metric on 3D ultrasound images, 
>> and as a quick test I tried using ImageRegistration11 on it with the 
>> dimension changed to 3 (and the parameters for the transform changed 
>> as well). However, when I try and run it I get the following error:
>>
>> $ ./ImageRegistration11.exe I0000005.hdr I0000006.hdr
>> ExceptionObject caught !
>>
>> itk::ExceptionObject (0xa05c370)
>> Location: "Unknown"
>> File: 
>> /home/Jordan/InsightToolkit-2.0.1/Code/Algorithms/itkMattesMutualInformationImageToImageMetric.txx 
>>
>> Line: 623
>> Description: itk::ERROR: 
>> MattesMutualInformationImageToImageMetric(0xa0528a0): Too many 
>> samples map outside moving image buffer: 0 / 10000
>>
>> I'd guess that it's something to do with the regions, however, the 
>> images are the same size, and I didn't change anything from the 
>> example, so I don't know what the matter is... Does anyone know what 
>> the problem is?
>>
>>
>> Thanks,
>>
>> Jordan
>> _______________________________________________
>> Insight-users mailing list
>> Insight-users at itk.org
>> http://www.itk.org/mailman/listinfo/insight-users
>>
>>
>
>
>