Need to calculate the VARIANCE of GLCM matrix of an image in MATLAB

1. How to calculate GLCM features in Matlab?
2. How is GLCM matrix calculated?
3. What is dissimilarity in GLCM?
4. What is GLCM in image processing?

How to calculate GLCM features in Matlab?

Calculate GLCMs using Four Different Offsets

offsets = [0 1; -1 1;-1 0;-1 -1]; Calculate the GLCMs, returning the scaled image as well. Display the scaled image, performing an additional rescaling of data values to the range [0, 1]. Note how the function returns an array of four GLCMs.

How is GLCM matrix calculated?

Each element (i,j) in the resultant glcm is simply the sum of the number of times that the pixel with value i occurred in the specified spatial relationship to a pixel with value j in the input image. The number of gray levels in the image determines the size of the GLCM.

What is dissimilarity in GLCM?

(f) Dissimilarity is a measure of distance between pairs of objects (pixels) in the region of interest.

What is GLCM in image processing?

GLCM is a second-order statistical texture analysis method. It examines the spatial relationship among pixels and defines how frequently a combination of pixels are present in an image in a given direction Θ and distance d.