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IXCONV
Perform a 2D convolution of a pair of images using FFTs. If both
images have the same dimensions then the user has a choice of
cyclic or non-cyclic convolution - non-cyclic is the only option
for datasets of different shape. In cyclic convolution the output
image has the same dimensions as the inputs, in non-cyclic the
dimensions are the sum of the dimensions of the inputs.
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