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How to segment image using SOM?

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Mohammad Al Nagdawi
Mohammad Al Nagdawi on 13 Feb 2017
Matlab has SOM function
Does anyone know how can use this function to segment the below image, for example, to 3 classes?
I tried to do this using the below code:
fix = zeros(500,500);
i = ones(500,100);
fix = double( mat2gray( [fix(:,1:200) i(:,:)*255 fix(:,1:100) i*125]));
net = selforgmap([500,1],100,3,'gridtop','dist');
net = train(net,fix);
y = net(fix);
classes = vec2ind(y);
Actually, I do not fully understand it.

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