resizing 3D matrix (image) in MATLAB

Question

I have a 3D matrix (MxNxK) and want to resize it to (M'xN'xK') (like imresize in matlab). I am using image pyramid, but its result is not very accurate and need a better one. Any solution?

Answer 1

You could use interp3 (since you want to interpolate 3D data):

im=rand(2,3,4); %% input image
ny=3;nx=3;nz=5; %% desired output dimensions
[y x z]=...
   ndgrid(linspace(1,size(im,1),ny),...
          linspace(1,size(im,2),nx),...
          linspace(1,size(im,3),nz));
imOut=interp3(im,x,y,z);