[Insight-users] Fwd: Casting 3D to 2D Images with CastImageFilter Results in Error

[John Drescher]

---------- Forwarded message ----------
From: Constantine Zakkaroff <mnkz at leeds.ac.uk>
Date: Fri, Jun 11, 2010 at 4:28 AM
Subject: Re: [Insight-users] Casting 3D to 2D Images with
CastImageFilter Results in Error
To: John Drescher <drescherjm at gmail.com>




On 10/06/2010 17:22, John Drescher wrote:
>
> On Thu, Jun 10, 2010 at 11:47 AM, Constantine Zakkaroff
> <mnkz at leeds.ac.uk>  wrote:
>>
>> Yello ALL.
>>
>> The description for CastImageFilter says this:
>>
>> CastImageFilter allows the input and output image to be different
>> dimensions. This is useful if you want to cast an 2D image to 3D image. The
>> resulting 3D image will have a single slice. If you attempt to cast an image
>> to a lower dimension, the first "slice" (or line or volume) will be
>> extracted. If you want to convert an image to a lower dimension and specify
>> the subspace (i.e. which slice of a volume, etc.) then you should use
>> ExtractImageFilter.
>>
>> While it is a slightly odd thing to do, I thought it can be used as a
>> shortcut to turn M*N*1-sized 3D images into M*N-sized 2D images.
>>
>> This code
>>
>> typedef itk::Image<USHORT, 3>  Image2DType;
>> typedef itk::OrientedImage<USHORT, 3>  Image3DType;
>>
>> typedef itk::CastImageFilter<Image3DType, Image2DType>  Cast3DTo2DFilterType;
>> Cast3DTo2DFilterType::Pointer cast3DTo2DFilter =
>> Cast3DTo2DFilterType::New();
>> cast3DTo2DFilter->SetInput(reformattedAngioSlice);
>> cast3DTo2DFilter->Update();
>>
>> results in error in
>> UnaryFunctorImageFilter<TInputImage,TOutputImage,TFunction>
>> ::GenerateOutputInformation(), when the output and input directions are
>> compared. Method's code runs past the end of the output direction matrix.
>>
>> ... unless I'm doing something wrong with the filter.
>>
>> Can anyone please clarify/confirm this issue?
>>
>
> Your 2D type is really 3D

Oh. Typo in this case. In the code I really have like this:
typedef itk::Image<USHORT, 2>  Image2DType.



-- 
John M. Drescher