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From: ImageAnalyst on 1 Jun 2010 21:05
On Jun 1, 5:52 pm, "Steve Amphlett" <Firstname.Lastn...(a)Where-I-
Work.com> wrote:
> If the filter has equal coefficients, consider writing a MEX function that uses a moving buffer.  The full convolution will do many more floating point ops than required.  It's a good learning exercise for newcomers to MEX.
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Not sure why you say "The full convolution will do many more floating
point ops than required." There is a smart way to do convolutions
(actually 2 smart ways) and a dumb brainless slow way. One of the
smart ways is not even that clever - it's rather obvious. I would bet
that the MATLAB conv() method uses the smart way that does not do any
more computations than is necessary. I know in the last release they
spent a lot of time in speeding up routines, though I bet conv() has
been optimized for quite some time now. Most novice users probably
program up convolution the dumb way because that is the most obvious.
But I agree that doing it any way could be a simple way to get used to
creating MEX files.

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