# Image segmentation using NN .. what is my mistake in the following code?

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Mohammad Al Nagdawi on 20 Feb 2017
I do image segmentation as preprocessing step to finding similarity.
Calculate similarity between 2 images as follow:
1. image resize.
2. image segmentation using clustering (SOM and LVQ) for the 2 images.
3. find similarity level using the like_som function.
clear;
len = size(fix(:));
small_img = imresize(fix,[50 50]);
hist_learn = imhist(small_img);
% replicate image hist to feed NN.
hist_learn = [hist_learn hist_learn];
%%SOM and LVQ network
net_v = selforgmap([10,10]);
net_v = train(net_v,hist_learn);
c = net_v(hist_learn); %class
n = lvqnet(10);
n = train(n,hist_learn,c);
%%Compare the org. image with (same) image after transformation
% Try to calc. similarity using NN.
min = -100;
max = 100;
Rout = imref2d(size(fix)); %create Reference2D object
out = zeros(21,11);
i=1;
for shift_x = min:10:max
cfloat = fix;
t=[1 0 0;0 1 0;shift_x 0 1];
tform = affine2d(t);
cfloat = imwarp(cfloat,tform,'outputView',Rout,'FillValues',cfloat(1,1));
small_img = imresize(cfloat,[50 50]);
%Calc. similarity between 2 images
out(i,:) = like_som(small_img,hist_learn,n);
i = i +1;
end
the like_som function
function out = like_som(im, hist, net)
hs = imhist(im);
cls = vec2ind(net(hs));
out = zeros(1,11);
[~, n] = size(hist);
for i = 1 : n
hist_i = hist(:, i);
n_hist = net(hist_i);
org_cls = vec2ind(n_hist);
if(cls == org_cls )
out(i) =1;
figure;imshow(im);title(['float, i = ' num2str(i)]);
end
end
% figure;imshow(im);title('float');
end