image - stationary wavelet transform (MATLAB) -

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anyone please explain being done following code. code performs image fusion using stationary wavelet transform.

 %image decomposition using discrete stationary wavelet transform    [a1l1,h1l1,v1l1,d1l1] = swt2(im1,1,'sym2');  [a2l1,h2l1,v2l1,d2l1] = swt2(im2,1,'sym2');  [a1l2,h1l2,v1l2,d1l2] = swt2(a1l1,1,'sym2');  [a2l2,h2l2,v2l2,d2l2] = swt2(a2l1,1,'sym2');   % fusion @ level2  afl2 = 0.5*(a1l2+a2l2);     **what these equations ?**  d = (abs(h1l2)-abs(h2l2))>=0;  hfl2 = d.*h1l2 + (~d).*h2l2;  d = (abs(v1l2)-abs(v2l2))>=0;  vfl2 = d.*v1l2 + (~d).*v2l2;  d = (abs(d1l2)-abs(d2l2))>=0;  dfl2 = d.*d1l2 + (~d).*d2l2;   % fusion @ level1  d = (abs(h1l1)-abs(h2l1))>=0;  hfl1 = d.*h1l1 + (~d).*h2l1;  d = (abs(v1l1)-abs(v2l1))>=0;  vfl1 = d.*v1l1 + (~d).*v2l1;  d = (abs(d1l1)-abs(d2l1))>=0;  dfl1 = d.*d1l1 + (~d).*d2l1;   % fused image  afl1 = iswt2(afl2,hfl2,vfl2,dfl2,'sym2');  imf = iswt2(afl1,hfl1,vfl1,dfl1,'sym2');

here afl2, hfl2, vfl2, dfl2 @ fusion level 2 are

approximation coefficients horizontal detail coefficients vertical detail coefficients diagonal detail coefficients

also same @ next level , respective mathematical implementations according concept.

it important read concept documents once can understand implementation easily, can find info's following link, can directly move block diagram explains concept , physical implementation:

http://ijeetc.com/ijeetcadmin/upload/ijeetc_50e52508758cf.pdf


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