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How does imresize 'Antialiasing' work?

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YOUNGMIN KIM on 29 Jul 2021
Commented: YOUNGMIN KIM on 29 Jul 2021
I want to know how the imresize function works when I set 'Antialiasing' option to true.
There are so many methods to make Antialiasing.
The imresize function says that when I set 'Antialiasing' option true, the imresize function will do antialiasing.
So I want to know exactly how imresize function does 'Antialiasing'.

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Accepted Answer

DGM on 29 Jul 2021
Edited: DGM on 29 Jul 2021
If I recall from digging through the code before, it mentions using a modified kernel to simultaneously interpolate and antialias. I don't know which methods are relevant to that chunk of code, but you're free to look at the code yourself.
I can't really point out line numbers since it changes between versions. Circa R2015b, most everything is still in imresize.m, which is in the IPT directory. Look for a function called contributions().
By R2019b, the parts of imresize() are spread across several files in $MLROOT/toolbox/matlab/images/+matlab/+images/+internal/+resize/
Look in that directory for contributions.m and see if you can make sense of it.

More Answers (1)

Image Analyst
Image Analyst on 29 Jul 2021
It probably blurs the image slightly.

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