How does imresize 'Antialiasing' work?

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'.

[Star Strider]

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).

[YOUNGMIN KIM]

Thank you for answering!

Answer 1

[DGM]

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.

[YOUNGMIN KIM]

Thank you for answering

Answer 2

[Image Analyst]

It probably blurs the image slightly.

[YOUNGMIN KIM]

Thank you for answering