Hi all,
when i read this great article( http://www.mathworks.com/help/images/examples/exploring-slices-from-a-3-dimensional-mri-data-set.html?s_tid=srchtitle ), i met a problem at step 2 : T0=maketform('affine',[0 -2.5 ;1 0;0 0]) . Could anyone help me understand why the resampling factor is 2.5 ?
Thanks in advance!
Sherri
----------------------------------------------------------------------------------------------
here are some main codes:
M2 = reshape(M1,[128 27]); size(M2)
figure, imshow(M2,map);
title('Sagittal - Raw Data');
ans =
128 27
We can obtain a much more satisfying view by transforming M2 to change its orientation and increase the sampling along the vertical (inferior-superior) dimension by a factor of 2.5 -- making the sampling interval equal in all three spatial dimensions. We could do this in steps starting with a transpose, but the following affine transformation enables a single-step transformation and more economical use of memory.
T0 = maketform('affine',[0 -2.5; 1 0; 0 0]);
The upper 2-by-2 block of the matrix passed to maketform, [0 -2.5;1 0], combines the rotation and scaling.
R2 = makeresampler({'cubic','nearest'},'fill');
M3 = imtransform(M2,T0,R2);
figure, imshow(M3,map);
title('Sagittal - IMTRANSFORM')
