[ITK-users] Filter working on both itk::Image and itk::VectorImage

[Matt McCormick]

Hi Cyril,

Yes, this is a good approach.  Thanks for sharing your investigation.

Matt

On Wed, Feb 22, 2017 at 5:52 AM, Cyril Mory
<cyril.mory at creatis.insa-lyon.fr> wrote:
> Answering my own question:
>
> I found a way to do what I needed using itk::NumericTraits<T> :
>
>   OutputImagePixelType pix;
>   itk::NumericTraits<OutputImagePixelType>::SetLength(pix,
> this->GetVectorLength());
>   pix = itk::NumericTraits<OutputImagePixelType>::OneValue(pix) * value;
>
> It works for both cases with the same code. However, if there is a better
> way (cleaner, safer, more compact, ... whatever the wayin which it is
> better), I'd be happy to learn about it.
>
> Best regards,
> Cyril
>
>
> On 22/02/2017 10:38, Cyril Mory wrote:
>>
>> Hi ITK users,
>>
>> I am writing an itk::ImageToImageFilter<T>, and I want the filter to work
>> with T=itk::Image as well as with T=itk::VectorImage.
>>
>> To set/get the vectorLength of an image (which is 1 for an itk::Image, and
>> varies for an itk::VectorImage), I have successfully used the functions
>> Set/GetNumberOfComponentsPerPixel from the itk::ImageBase class, which work
>> for both itk::Image and itk::VectorImage.
>>
>> But I cannot find a way to initialize one of the pixels to a given value,
>> that would work for both cases, i.e. whether that pixel is a scalar or a
>> variableLengthVector. For now, the best I could do is define a function
>> FillPixel in my filter, like this:
>>
>> OutputImagePixelType FillPixel(OutputImageInternalPixelType value) {return
>> value;}
>>
>> and write a template specialization when my filter is instantiated with
>> itk::VectorImage<float, 3>, like this:
>>
>> template <>
>> itk::VariableLengthVector<float>
>> rtk::ConstantImageSource<itk::VectorImage<float, 3> >
>> ::FillPixel(float value)
>> {
>>   itk::VariableLengthVector<float> vect;
>>   vect.SetSize(this->GetVectorLength());
>>   vect.Fill(value);
>>   return (vect);
>> }
>>
>> Did I miss something ? Is there a better way of doing this in ITK ?
>>
>> Looking forward to reading you,
>> Cyril
>>
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