Counting Voxels in a Binary Mask

2013 8 7
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I have a mask, which is binary and 3-D. I want to count the number of white voxels. How can I do it?

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Iain
Iain 2013-8-7

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if white is true:
count_of_white_voxels = sum(mask(:)) ;

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I am using masks in NIFTI format. Here is my code:
clc; nii= load_nii('Seg.nii');%% loading NIFTI files view_nii(nii); %Count voxels count_of_white_voxels = sum(mask(:));
I keep getting this error: Undefined function 'sum' for input arguments of type 'struct'
I think i figured what the error is..
I used
count_of_white_voxels = sum(nii.img(:)) ;
Now there is no error

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