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From: Jason on 16 Mar 2010 12:59
Hello,

Does anyone know which Matlab functions implement convolution via FFTs, and which ones use double sums? Thanks.

Jason
From: Bruno Luong on 16 Mar 2010 13:27
fft: xcorr, xcov
brute force sum: conv, conv2, convn, xcorr2

Bruno
From: David Young on 16 Mar 2010 13:47
I guess you are doing 2D convolution/correlation since you mention double sums. If so, you might like to try out the function at http://www.mathworks.com/matlabcentral/fileexchange/22619-fast-2-d-convolution which for some masks will appreciably speed up 2D convolution; the underlying method is brute force using conv2, not FFT.
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