How to normalize GLCMs created for four offsets?
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I am using Matlab 2019b to extract texture features of images using gray level co-occurrence matrix (glcm). I have written the following code to extract rotation invariant features with directions 0, 45, 90, 135. The code creates four glcms and every feature has four values; one per direction.
I = imread('test.jpg')
offsets = [0 1; -1 1;-1 0;-1 -1];
glcm = graycomatrix(I, 'GrayLimits', [], 'Offset',offsets);
stats = graycoprops(glcm);
I want to normalize the glcms then extract each feature from the normalized glcms.
Any help is greatly appreciated.
2 Commenti
Image Analyst
il 22 Mar 2020
Not sure what you want. Do you just want this
glcm = glcm / sum(glcm(:));
or
glcm = glcm / max(glcm(:));
or
glcm = rescale(glcm, 0, 1);
Mohammad Farhad Aryan
il 23 Mar 2020
Modificato: Mohammad Farhad Aryan
il 24 Mar 2020
Risposte (2)
Image Analyst
il 24 Mar 2020
Regarding your last comment above . . .It told you it's not integer and it needs integer. So, cast it to integer:
uint8Image = uint8(rescale(rgb2gray(mskRgbImg), 0, 255));
Then pass that into graycomatrix().
See my attached glcm demo.
3 Commenti
Image Analyst
il 25 Mar 2020
So don't normalize it. Why do you think each should be normalized? If each is normalized independently then how can you compare them?
Hend Abouche
il 8 Apr 2022
Modificato: Image Analyst
il 8 Apr 2022
Hello, I am working on texture features extraction and I want to ask you why you didn't use just the function graycomatrix in a simple way, but you used the offset. Did you do it so you can specify the pixels that you want to calculate their co-occurrence?
5 Commenti
nissrine Neyy
il 23 Giu 2022
Hi @Image Analyst, i have a question in the same context, what's the difference between using symmetric and not (set it to false or true), i know how it works but in term of results which is better and what does it give or add as an information ?
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