Compute FFT (Fourier Transform) in ITK for a 2d image

typedef float       OutputPixelType;
typedef itk::Image< OutputPixelType, 2 >    OutputImageType;
typedef itk::ForwardFFTImageFilter< OutputImageType > FFTType;
typedef FFTType::OutputImageType ComplexImageType;
ComplexImageType::Pointer  ClassType::computeFFT(OutputImageType::Pointer image,int padXSize,int padYSize)
{

 
   OutputImageType::SizeType regionSize =getImageSize(image);
  typedef itk::WrapPadImageFilter< OutputImageType, OutputImageType > PadFilterType;
  PadFilterType::Pointer padFilter = PadFilterType::New();
  padFilter->SetInput( image );
  PadFilterType::SizeType padding;
  // Input size is [48, 62, 42].  Pad to [48, 64, 48].
  padding[0] = padXSize- regionSize[0];
  padding[1] = padYSize- regionSize[1];
 
  padFilter->SetPadUpperBound( padding );




  FFTType::Pointer forwardFFTFilter = FFTType::New();
  forwardFFTFilter->SetInput( padFilter->GetOutput() );
  forwardFFTFilter->Update();
  ComplexImageType::Pointer complexImage= forwardFFTFilter->GetOutput() ;
  return complexImage;

 
}