I have an image that I would like to use to make a graph. Pixels are the nodes and edges represents 8-neighbourhood. I tried this
I=imread('cameraman.tif');
[X Y]=size(I);
CONNECTED = 8; %# 4-/8- connected points
%# which distance function
if CONNECTED == 4, distFunc = 'cityblock';
elseif CONNECTED == 8, distFunc = 'chebychev'; end
%# compute adjacency matrix
[X Y] = meshgrid(1:N,1:M);
X = X(:); Y = Y(:);
adj = squareform( pdist([X Y], distFunc) == 1 );
got error as
Error in pdist (line 252)
Y = pdistmex(X',dist,additionalArg);
Error in gra (line 12)
adj = squareform( pdist([X Y], distFunc) == 1 );
Do you want to create a histogram of the image? you have to use the imhist() function in matlab, it takes two parameters... the image I and the number of bins n... that is:
hist=imhist(I,n);
This might help you.
https://jethomson.wordpress.com/tsl230r-articles/how-to-convert-a-graph-saved-as-an-image-to-point-series-plot-data/
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