How to resize a 3D matrix?

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Sandhiya Prakash 2017-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/329709-how-to-resize-a-3d-matrix

评论： SojM 2020-7-17

Hi, I want to reduce the size of a 3D image by averaging the values in 3D. For example if the image is 160*216*176. I wrote the code below to process the image to average the values in every 4*4*4 cube thereby creating a new matrix that is 40*54*44 in size.my code is below

X(1:40)=4;
Y(1:54)=4;
Z(1:44)=4;
A=mat2cell(imagestack_1,[X],[Y],[Z]);
average=cellfun(@mean2,A);

But this shows an error

Error using mat2cell (line 97)
Input arguments, D1 through D3, must sum to each dimension of the input matrix size, [160  216  176].'

Anyone who knows Please guide me!!

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Sandhiya Prakash 2017-3-14

I am using MatlabR2016a.

Sandhiya Prakash 2017-3-14

I think i must give variable in which 3D image is stored instead of imagestack_1. Kindly guide me.I am new to matlab.

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Walter Roberson 2017-3-14

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You probably had previous values in your X, Y, or Z, making them longer than what would be created with just the above code.

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Walter Roberson 2017-3-14

The boundary points do not have 27 neighbors. You should either calculate only on the interior, or you should define what you want the boundary calculation to be.