[Insight-users] Mattes MI: "Too many samples map outside..."

[Xabier Artaechevarria Artieda]

Hallo Christoph,
Thanks for the answer.
I checked after 174 iterations and the overlap seems in fact good, and
it is considerably better than at the first iteration. Do you think I
could solve the problem by using a higher number of spatial samples?
Now I am using one tenth of the total voxels.
Regards,
Xabi



Christoph Palm <christoph.palm at web.de> ha escrito:

> Hi Xabi,
>
> do they overlap well also after the 174 iterations?
> Perhaps you try to apply the last transformation paramters onto your
> moving image and look what happens.
>
> Regards
>
> Christoph
>
> On Thu, 2007-02-08 at 11:30 +0100, Xabier Artaechevarria Artieda wrote:
>> Hi all,
>> I am registering multiple images using Bspline transform. The program
>> is working fine with all images except with one couple. I get the
>> following error after 174 iterations:
>>
>> 170   -1.07817   4.07948e-05
>> 171   -1.07818   4.09635e-05
>> 172   -1.07818   5.61295e-05
>> 173   -1.07818   4.65465e-05
>> 174   -1.07818   4.64441e-05
>> ExceptionObject caught !
>>
>> itk::ExceptionObject (0x6c81a0)
>> Location: "void
>> itk::MattesMutualInformationImageToImageMetric<TFixedImage,
>> TMovingImage>::GetValueAndDerivative(const typename
>> itk::ImageToImageMetric<TFixedImage, TMovingImage>::ParametersType&,
>> typename itk::ImageToImageMetric<TFixedImage,
>> TMovingImage>::MeasureType&, typename
>> itk::ImageToImageMetric<TFixedImage, TMovingImage>::DerivativeType&)
>> const [with TFixedImage = main(int, char**)::FixedImageType,
>> TMovingImage = main(int, char**)::MovingImageType]"
>> File:
>> /usr/local/etc/ITK/Code/Algorithms/itkMattesMutualInformationImageToImageMetric.txx
>> Line: 995
>> Description: itk::ERROR:
>> MattesMutualInformationImageToImageMetric(0x6ab920): Too many samples
>> map outside moving image buffer: 0 / 184251
>>
>> I have seen a previous thread where it was mentioned that this might
>> be due to a lack of overlap between the images. However, at least
>> visually, images seem to overlap quite well.
>> Is there any other possible reason? And ways to solve it?
>> Thanks in advance,
>> Xabi
>>
>>
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