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Lee ZY
Posts:
23
Registered:
9/1/10


GLCM texture image
Posted:
Jan 16, 2013 10:25 PM


I would like to generate a texture image based on GLCM Inverse Difference Moment. After going through this site 'http://www.fp.ucalgary.ca/mhallbey/texture_calculations.htm'. If I am not wrong, it's found that we need to create a sliding window and generate the texture value(s) on each window, which then form a texture image. and below shows the code i did, which i am not sure if i'm doing it right. Could you guys please advise me on this?
image=imread('circuit.tif'); [imageHeight, imageWidth]=size(image); windowWidth = 3; windowHeight = 3; k2=floor(windowWidth/2);
for i = 1:imageHeight  windowHeight + 1 for j = 1:imageWidth  windowWidth + 1 % Compute the normalized GLCM in each window as illustrated in 'http://www.fp.ucalgary.ca/mhallbey/ans_ex_1.htm window = image(i:i + windowHeight  1, j:j + windowWidth  1, :); wind=window(:); Num=length(unique(wind)); glcm1 = graycomatrix(window,'NumLevels',Num,'G',[]) ; glcm2=glcm1'; symm=glcm1+glcm2; sumEle=sum(symm(:)); M=symm/sumEle ; %normalization % operations within window for a=1:Num for b=1:Num IDM(a,b) = M(a,b)/(1+(ab)^2) ; % Inverse Difference Moment end end IDM = sum(IDM(:)); % replace IDM to the center of the window and save it as image2 image2(i+1,j+1)=IDM ; end end [x,y]=size(image2); CroppedInverseDiffImage=image2(2:x,2:y); % crop the vacant pixels figure(2),imshow(CroppedInverseDiffImage);
The result does not look 'good', wondering if there's any mistake i made. Thank you very much in advance.



