How to find GLCM of part of (or between 2 concentric circles in) an image?

The image (greyscale/uint8 type) consist of a black background with the real information in between 2 rings towards the centre. But the GLCMs are calculated for the whole image. If I have to use masking to analyse the ROI, I used:

m1 = drawcircle('Center',[Xcen,Ycen],'Radius',OuterRadius,'Color','blue');

m2= drawcircle('Center',[Xcen,Ycen],'Radius',InnerRadius,'Color','red');

M=m1-m2; % I want area btw these radiuses.

But it doesn't do subtraction like this.

Answer 1

[Neha]

Hi Eliza,

I understand that you want to subtract the regions obtained by the "drawcircle" function. You can refer to the code snippet given below:

% Create binary masks for both the regions 
mask1=createMask(m1) 
mask2=createMask(m2) 
intersectionMask = mask1 - mask2 
imshow(intersectionMask) 

You can also refer to the following documentation link for more information about the "createMask" function:

https://www.mathworks.com/help/images/ref/images.roi.assistedfreehand.createmask.html

Hope this helps!