[ITK] [ITK-users] concept checking error - RegistrationMethodv4

[Bradley Lowekamp]

Hello,

The current ITKv4 registration frame work is limited to real type (float/double). I believe it could be changed with some work, I think much of the reasoning for this requirement has to do with the way the multi-scale and gradient magnitude are implemented.

If you image is large, perhaps you should reduce the resolution before performing registration?

Brad

On Jan 14, 2015, at 11:55 AM, Hammond, Emily M <emily-hammond at uiowa.edu> wrote:

> Hello,
> 
> I am working with very large images and would like to use a short pixel type for my fixed and moving images within the ImageRegistrationMethodv4; however, my code does not build until a float pixel type is used. Here is a snippet of my code (looks pretty standard):
> 
> const unsigned int Dimension = 3;
> typedef short PixelType;
> 
> typedef itk::Image< PixelType, Dimension > FixedImageType;
> typedef itk::Image< PixelType, Dimension > MovingImageType;
> 
> typedef itk::MattesMutualInformationImageToImageMetricv4< FixedImageType, MovingImageType > MetricType;
> typedef itk::ImageRegistrationMethodv4< FixedImageType, MovingImageType, TransformType > RegistrationType;
> 
> RegistrationType::Pointer registration = RegistrationType::New();
> MetricType::Pointer metric = MetricType::New();
> 
> At this point in the code, the following error is thrown (not seen if using float pixel type):
> error C2440: 'initializing' : cannot convert from 'itk::Concept::Detail::UniqueType_bool<__formal>' to 'itk::Concept::Detail::UniqueType_bool<__formal>'
> 
> Can anyone give me some insight into this problem? From previous experience I know that short pixel types work with the metrics and registration method from the previous version. Does version 4 not have these capabilities?
> 
> Thanks!
> Emily Hammond
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