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function W = construct_w2(centers,Ds,img_center,indexes,frames)
%
% function W = construct_w2(centers,Ds,img_center,indexes,frames)
% optional: frames
%
points = length(indexes);
if (nargin == 4),
frames = 0.5*size(centers,2);
end
W = zeros(3*frames,points);
center_x = img_center(1);
center_y = img_center(2);
for j=1:frames,
% x is centers(:,2*j-1)
% y is centers(:,2*j)
% d is Ds(:,2*j-1)
W(j,:) = (centers(indexes,2*j-1) -center_x)'./Ds(indexes,2*j-1)';
W(j+frames,:) = (centers(indexes,2*j) -center_y)'./Ds(indexes,2*j-1)';
W(j+2*frames,:) = ones(1,points)./Ds(indexes,2*j-1)';
end
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