ITK
6.0.0
Insight Toolkit
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#include <itkFFTDiscreteGaussianImageFilter.h>
ITK defines multiple possible sources for generating a Gaussian kernel for smoothing.
Generating an ND kernel by multiplying N 1D directional operators produces nearly identical results to the DiscreteGaussianImageFilter class.
Generating an ND kernel image directly with GaussianImageSource relies on a slightly different spatial function and will produce different smoothing, but kernel generation will be faster.