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function islands = bwislands(img)
%
% islands=bwislands(img)
%
% return the indices of non-zero elements in a 2D or 3D image
% grouped by connected regions in a cell array
%
% author: Qianqian Fang (q.fang at neu.edu)
%
% input:
% img: a 2D or 3D array
% output:
% islands: a cell array, each cell records the indices
% of the non-zero elements in img for a connected
% region (or an island)
%
% -- this function is part of iso2mesh toolbox (http://iso2mesh.sf.net)
%
img = logical(1 - img);
idx = find(1 - img(:));
islands = {};
count = 1;
out = cell(1, ndims(img));
while (~isempty(idx))
[out{:}] = ind2sub(size(img), idx(1));
imgnew = imfill(img, cell2mat(out));
islands{count} = find(imgnew ~= img);
count = count + 1;
img = imgnew;
idx = find(1 - img(:));
end
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