resize image respect to its original size

[YingdiZhang]

Thanks for the great job. I want to resize my image to the half of original size using MONAI transform. But dont find an appropriate transform. I found monai.transform.Resize can resize an image to a given size but can not to a size relevent to orininal image size.

[KumoLiu]

Hi @YingdiZhang, specifying spatial_size to be half the size of the original image doesn't work?

[YingdiZhang]

Thanks for the reply, I didnt express clearly. My 3D CT images have different size, which is range from [290, 290, 203] to [816, 816, 476]. While monai.transform.Resize can not resize a image directly with fraction of original size

[wyli]

I think you can use Zoom

MONAI/monai/transforms/spatial/array.py

Lines 1128 to 1137 in 78d4f42

	class Zoom(InvertibleTransform):
	"""
	Zooms an ND image using :py:class:`torch.nn.functional.interpolate`.
	For details, please see https://pytorch.org/docs/stable/generated/torch.nn.functional.interpolate.html.
	Different from :py:class:`monai.transforms.resize`, this transform takes scaling factors
	as input, and provides an option of preserving the input spatial size.
	Args:
	zoom: The zoom factor along the spatial axes.

[YingdiZhang]

Thanks for your answer, it solved my problem