How does imresize 'Antialiasing' work?

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YOUNGMIN KIM
YOUNGMIN KIM 2021-7-29
评论： YOUNGMIN KIM 2021-7-29
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'.
  2 个评论
Star Strider
Star Strider 2021-7-29
It could be similar to the antialiasing in the Signal Processing Toolbox resample function, that uses a FIR filter to remove spurious high frequencies (greater than the original signal Nyquist frequency) that are created in the interpolation process.
I have not looked at the code of either one in any detail (assuming that is even possible).

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DGM
DGM 2021-7-29
编辑：DGM 2021-7-29
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.
EDIT:
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.

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Image Analyst
Image Analyst 2021-7-29
It probably blurs the image slightly.

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