[ITK-users] Using PermuteAxesImageFilter incorrectly

[Bradley Lowekamp]

What is the problem you are encountering?

> On May 15, 2014, at 8:13 PM, Ricky Singla <rsingla92 at gmail.com> wrote:
> 
> Hi there,
> 
> I'm having some trouble using the PermuteAxesImageFilter.  I have an image, which I know is allocated correctly and has values in its buffer, that i'm trying to transpose (swap the X and Y axes). PermuteAxesImageFilter looked the most suitable. After that filter, I'm subtracting a constant from the image using the SubtractImageFilter. I've used the PermuteAxesImageFilter example as a reference, but evidently I'm forgetting something.
> 
> Here's a code snip:
> 
> void func() 
> {
> 	typedef itk::PermuteAxesImageFilter<ImageType> PermuteAxesType;
> 	typedef itk::SubtractImageFilter<ImageType, ImageType> SubtractImageFilterType;
> 
> 	// Allocate Y 
> 	// define and set magicalConstant, which is of type ImageType::PixelType
> 
> 	itk::FixedArray<unsigned int, 2> order; order[0] = 1; order[1] = 0;
> 
> 	PermuteAxesType::Pointer permuteAxes = PermuteAxesType::New();
> 	permuteAxes->SetInput(Y);
> 	permuteAxes->SetOrder(order);
> 	permuteAxes->Update();
> 
> 	SubtractImageFilterType::Pointer subtractFilter = SubtractImageFilterType::New();
> 	subtractFilter->SetInput(permuteAxes->GetOutput());
> 	subtractFilter->SetConstant(magicalConstant);
> 
> 	Y = subtractFilter->GetOutput(); // transposed - magicalConstant
> 
>  	// other stuff
> }
> 
> Any ideas as to what I'm doing wrong here? 
> 
> Thanks.
> 
> 
> Ricky Singla 
> 
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