resampleImageFilter

[sedghi]

Hi!

I saw there is a package already for downSample https://github.com/InsightSoftwareConsortium/ITK-Wasm/tree/main/packages/downsample

My questions are:

1. I guess it is not the same as ResampleImageFilter.
2. It can't upsample either I guess
3. Any plan to add ResampleImageFilter?

Thanks a lot!

[thewtex]

Hi @sedghi ,

Yes, we will be adding a resample package!

In additional to the ResampleImageFilter-like API, is there a particular set of functionality or interface you are looking for?

[sedghi]

Hey Matt,

Resampling to a new spacing given a size, or to a new size given the new spacing. I've been looking into RTDose support, and I really don't think it's possible to get good resolution without resampling. And that's not even mentioning image registration, which pretty much always requires resampling.

Here are the operations:

resample = sitk.ResampleImageFilter()
resample.SetOutputSpacing(out_spacing)
resample.SetSize(out_size)
resample.SetOutputDirection(itk_image.GetDirection())
resample.SetOutputOrigin(itk_image.GetOrigin())
resample.SetTransform(sitk.Transform())
resample.SetDefaultPixelValue(itk_image.GetPixelIDValue())

resample.SetInterpolator(sitk.sitkCosineWindowedSinc)
resample.Execute(itk_image)

[sedghi]

@thewtex I'm going to start implementing this. Any objections or ongoing work I should know about before I begin?
I can see volview has something https://github.com/Kitware/VolView/tree/main/src/io/resample/emscripten-build but i'm not sure i wanna repeat writing another custom wasm

[thewtex]

@sedghi I actually started this afternoon. Appreciate your review once the PR is up

[sedghi]

Absolutely.

[thewtex]

Released in the downsample package v2.0.0

xref: #1550 #1548