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What is '1butter' in this Wiener Filter code?

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Matthew Worker
Matthew Worker on 7 Nov 2021
Edited: John Kelly on 8 Dec 2021
MATLAB doesnt recognise the 1butter in this code of Wiener Filtering on an image in MATLAB

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Dave B
Dave B on 7 Nov 2021
Edited: Dave B on 7 Nov 2021
I'm guessing it's just supposed to be butter, there's no function in MATLAB called 1butter, and there couldn't be because numbers can't be at the beginning of a function name, and I doubt it's lbutter (i.e. a lowercase L), and the function signature/usage looks just like butter. I think it's a typo.

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