test code

pdf1=double(imread('image1.tif'));
pdf2=double(imread('image2.tif'));
%%% assumes 1 color channel images

[u dt cur energy] = match_pdfs_2d_haker(pdf1, pdf2);

%% computes a displacement interpolation
[M N] = size(pdf1);
[X,Y] = meshgrid(1:N, 1:M);
uxmid = u(:,:,1)-repmat(1:N, M, 1);
uymid = u(:,:,2)-repmat(transpose(1:M), 1, N);
k = 0;
for t=0:0.025:1
    uintx = repmat(1:N, M, 1) + t*uxmid;
    uinty = repmat(transpose(1:M), 1, N) + t*uymid;
    [dudx dudy] = gradient(reshape([uintx uinty], size(u)));
    Du = abs(dudx(:,:,1).*dudy(:,:,2)-dudx(:,:,2).*dudy(:,:,1));
    interpResult = interp2(X,Y,pdf2, uintx, uinty, 'linear', 0.);
    imga=interpResult.*(Du);
    figure(2);
    image(imga*0.25);
    colormap('gray');
    k=k+1;
    s = sprintf('out_haker_%2.2u.png', k);
    imwrite(imga*0.25/65., s);
end