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make_masks.m
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make_masks.m
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function masks = make_masks(repulsion)
[n,m] = size(repulsion) ;
masks = cell( n , m ) ;
for ii=1:n
for jj=1:m
D = repulsion(1,1) ;
s = floor(2*D + 5) ;
c = floor(D + 3) ;
disks = cell(5,1) ;
for d=1:5
disks{d} = zeros(s) ;
end
shift = cell(5,1) ;
shift{1}= [ 0 0] ;
shift{2}= [ 1 0] ;
shift{3}= [ 0 1] ;
shift{4}= -shift{2} ;
shift{5}= -shift{3} ;
for i=1:s
for j=1:s
for d=1:5
if sqrt( (i-c-shift{d}(1))^2 + (j-c-shift{d}(2))^2 ) <= D
disks{d}(i,j) = 1 ;
end
end
end
end
for d=1:4
[x,y] = find( disks{1+d} & ~disks{1} ) ;
masks{ii,jj}.cardinal{d} = [x y] - c ;
end
[x,y] = find( disks{1} ) ;
masks{ii,jj}.exclusion = [x y] - c ;
masks{ii,jj}.shift = shift(2:5) ;
masks{ii,jj}.opposite = [3 4 1 2] ;
end
end
% % testing with plot
% im = zeros(s,s,3) ;
% for d=1:3
% inds = s*s*(d-1) + masks.cardinal{d}(:,1)+c + ...
% s*(masks.cardinal{d}(:,2)+c-1) ;
% im( inds ) = 1 ;
% end
% imagesc(im)