What does this means ?

 Dear all,

I picked up a window of 5X5 from a given image im1=im(1:5,1:5)

ans =

41 40 38 38 37

42 40 38 37 35

43 41 38 37 34

43 41 37 35 33

42 40 36 33 31

then I used graycomatrix to calculate the glcm matrix as following: glcm=graycomatrix(im1) glcm =

0 0 0 0 0 0 0 0

1 19 0 0 0 0 0 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

My questions are: why the result matrix is 8*8 ? how can we get the number of gray levels of an image ? How can i interpret the values 1 and 19 in the glcm matrix ?

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The range between 0 and 255 is divided into 8 ranges by default. They are 0-31, 32- 63, 64-95, etc. As you can see all of your elements are in the second range, except for the one with the value 31. The count is the number of times a number in one range occurs horizontally adjacent to another in another range. You have 19 pairs where the side-by-side pixels are both in range 2, and only one pairing, when it's looking at the very lower right, where there is a pairing between a number in range 2 (33) and a number in range 1 (31). I know it can be kind of tricky, so do you understand that explanation?

 

You can adjust the window size and the range size. You can have a 256 by 256 array if you want. See my demo.

% Finds and displays the GLCM of a user chosen gray scale image.
clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear all;  % Erase all existing variables.
workspace;  % Make sure the workspace panel is showing.
fontSize = 18;

% Change the current folder to the folder of this m-file.
% (The line of code below is from Brett Shoelson of The Mathworks.)
if(~isdeployed)
	cd(fileparts(which(mfilename)));
end

% Check that user has the Image Processing Toolbox installed.
hasIPT = license('test', 'image_toolbox');
if ~hasIPT
	% User does not have the toolbox installed.
	message = sprintf('Sorry, but you do not seem to have the Image Processing Toolbox.\nDo you want to try to continue anyway?');
	reply = questdlg(message, 'Toolbox missing', 'Yes', 'No', 'Yes');
	if strcmpi(reply, 'No')
		% User said No, so exit.
		return;
	end

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