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How to make the output size of imwarp the same as the input?

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渲航 2023-5-20
回答： 渲航 2023-5-21
I have some 3D images and wish to perform some rigid transform on them and keep the input size and output size the same. I used the imwarp function for these operations. But I found that it seems impossible to directly give parameters to ensure that the input and output have the same size as functions such as imrotate. How should I deal with it?
(Theoretically I can also crop or pad by myself, but sometimes the size of the image has an odd number, which makes it difficult to define the transformation by myself.)

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Matt J
Matt J 2023-5-20
There is an OutputView input parameter that will let you control that,
https://www.mathworks.com/help/images/ref/imwarp.html#btqog63-1-OutputView

更多回答（1 个）

渲航
渲航 2023-5-21
I found the solution by Matt J's answer
Besides the transform defnition
tform = rigidtform3d(rotation,translation);
We should define another object by function affineOutputView, such as
sameAsInput = affineOutputView(size(img_pad),tform,"BoundsStyle","SameAsInput"); % the same output size as input
then applied both of them
res_volume = imwarp(img,tform,"OutputView",sameAsInput);

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