image_to_matrix.m

kmeans clustering in matlab

function [imatrix, index] = image_to_matrix(data)
%
% converts an array structure of the form data(:,:).image
% to an n x d matrix, where each row is a raster-vector
% representation of data(:,:).image.



[m n] = size(data);
[nx ny] = size(data(1,1).image);
count = 1;
for i=1:m
   for j=1:n
      [inx iny] = size(data(i,j).image);
      if inx==nx & iny==ny
            imatrix(count,:) = reshape(data(i,j).image, 1, nx*ny);
            index(count,1) = i;
            index(count,2) = j;
            count = count + 1; 
   	end
            
   end
end
fprintf('%d images in total\n',count-1);