How can I find the overlap between two binary volumes?

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Dalas
Dalas 2013-7-19
I'm trying to compare two volumes consisting of 3D white shapes on a black background using matlab 2013 for windows.
1) I want to know how much they overlap over all. Correct me if I'm wrong but I think I can use the nnz function to do that.
2) I want to know where the volumes do not overlap. I have no clue how to accomplish this.
Any help is appreciated.

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Image Analyst
Image Analyst 2013-7-19
Define "find the overlap". To get the overlap image:
overlapImage = binaryVolume1 & binaryVolume2;
% To count number of pixels
numOverlapPixels = nnz(overlapImage);
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Dalas
Dalas 2013-7-19
I dont need to create the volumes I already have them i just need to analyze them.
I'm looking at mri brain scans by the way just so you have some context of what im working on.
I geuss the volumes arn't actually volumes either their simply stacked 2d "brain slices". We arnt using 3d mr image aquisition. But I think for matlabs purposes its the same as a 3d volume.
Would xor work on 3d arrays?
Dalas
Dalas 2013-7-19
We're ignoring tissue differences and converting the images into a binary image to focus on brain volume at the moment rather than pathology.

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