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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
selforgmap
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:
clear;
fix = zeros(500,500);
i = ones(500,100);
fix = double( mat2gray( [fix(:,1:200) i(:,:)*255 fix(:,1:100) i*125]));
%%SOM
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.
Thanks

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