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I am trying to use FFT as a fast way to convolve a image, however one of the downsides of this is that the "kernel" image will repeat when reaching the edges of the sample.

Is there a way to avoid this to make it more like a classic convolution, that cuts off at the edges?

Edge repeating

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Zero-pad the edges of the image, then truncate the excess edge from the result

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    $\begingroup$ While you answer is correct, it would be good to add how much to zero-pad, truncate, etc. $\endgroup$
    – Jim Clay
    Commented Oct 8, 2014 at 3:20

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