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function [A,D] = iter_AD(I,J,mask,w,k,num_trans)
%
% function [A,D] = iter_AD(I,J,mask,w,k,num_trans)
%
% find the affine motion A, and displacement D,
% such that difference between I(Ax-D) and J(x) is minimized.
% If k <= num_trans, only translation is computed. This is useful
% in practice, when translation is relative large.
%
% mask: the weight matrix,
% w: window size for estimating gradiant, use a large value
% when A,D are large.
%
%
% Jianbo Shi
%
if k <= num_trans,
D = find_D(I,J,mask,w);
A = eye(2);
else
[A,D] = find_AD(I,J,mask,w);
end
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