how can I process the similarity of two images using jaccard distance in matlab gui?

% We compute the intersection of the two lines using the "AND" operator "&".

intersectImg = intersect(J,L);

%figure; imagesc(intersectImg); axis image; colormap gray; title('intersection');

% We compute the union of the two lines using the "OR" operator "|".

unionImg = union(J,L);

%figure; imagesc(unionImg); axis image; colormap gray; title('union');

% There is only one pixel that overlaps (intersects)

numerator = sum(intersectImg(:));

% There are 5 pixels that are unioned.

denomenator = sum(unionImg(:));

% So intuitively we might expect that a similarity of 1/5 would

% be a good indication. This is exactly what Jaccard's does.

jaccardIndex = numerator/denomenator

% Jaccard distance shows how dis-similar the two line drawings are.

jaccardDistance = 1 - jaccardIndex