Segmentation of MR Images using berkeley wavelet transform

I have to do the segmentation of MR images using berkeley wavelet transform to detect tumor but it is confusing since i am a newbie to MATLAB.The value of DC term of bwt should be zero, so is working fine but i have problems while implementing mother wavelet section. Can someone help me to write the code for:

here i,j are the multiple positions on x,y plane. s is scale and the other sign is transforming function...

% coefficient value
u= imresize(img,[512 512]);
[row, col]= size(u);
r=floor(row/3);
c=floor(col/3);
img1=u(1:r,1:c);
bcf=1/sqrt(9).*img1;
imshow (b);
% mother wavelet
%how to do code for this part...
% b= 1/s^2.b(3^s(r-i),3^s(c-j))