function myAffinityMat = Image2Graph (imIn)
%Image2Graph produces a graph, in the form of a matrix, from an image
%   Usage myAffinityMat = Image2Graph (imIn), where:
%       Inputs
%       - imIn is the input image
%       Output
%       - myAffinityMat is the graph produced

    % Initializes helper variables
    imageWidth = size(imIn, 2);
    imageHeight = size(imIn, 1);
    imageChannels = size(imIn, 3);
    
    singleLineTransform = reshape(imIn, 1, [], imageChannels);
    diff = repmat(singleLineTransform, imageWidth * imageHeight, 1, 1) - ...
        permute(singleLineTransform, [2 1 3]);
    dist = sum(diff .^ 2, 3) .^ 0.5;
    myAffinityMat = 1 ./ exp(dist);
end