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I need to extract GLCM features like energy entropy contrast among others of the REGION OF INTEREST ONLY excluding the black background,i managed to extract those features for the entire image but i only need them for the region of interest knowing that everything else will be black

% Loop over all GLCMs

for k = 1:nglcm

currentGLCM = glcm(:,:,k);

glcmMean(k) = mean2(currentGLCM);

% For symmetric GLCMs, uX = uY

uX(k) = sum(I.*currentGLCM(sub));

uY(k) = sum(J.*currentGLCM(sub));

sX(k) = sum((I-uX(k)).^2.*currentGLCM(sub));

sY(k) = sum((J-uY(k)).^2.*currentGLCM(sub));

out.contrast(k) = sum(abs(I-J).^2.*currentGLCM(sub)); %OK

out.dissimilarity(k) = sum(abs(I - J).*currentGLCM(sub)); %OK

out.energy(k) = sum(currentGLCM(sub).^2); % OK

out.entropy(k) = -nansum(currentGLCM(sub).*log(currentGLCM(sub))); %OK

out.inverseDifference(k) = sum(currentGLCM(sub)./( 1 + abs(I-J) )); %OK

out.homogeneity(k) = sum(currentGLCM(sub)./( 1 + (I - J).^2)); %OK

Ragini Gaikwad
on 13 May 2021

Guys, please help me on this. I want to take 10 images form my image database, read them, index them, find grey level and histogram. make bin to size 15. calculate feature vector of each image. calulate ED or MSE.

please help me with this.

Phuong Nguyen
on 3 Apr 2020

Binu
on 8 May 2020

Force all pixel values outside your region of interest as a 'NaN'. The graycomatrix methods by default ignores any pixel pairs having a 'NaN' value.

https://www.mathworks.com/help/images/ref/graycomatrix.html#namevaluepairarguments (read Algorithms section)

Binu
on 4 Aug 2017

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