Hello,
The following sample code will extract the segment of image that you could use for classification.
Here I assumed you wanted to threshold an RGB image and you are using grey scale intensity of the RGB image for Otsu’s thresholding.
colorImage= imread('peppers.png');
grayVersion = rgb2gray(colorImage);
thresholded = imbinarize(grayVersion);
thresholded(:,:,2) = thresholded;
thresholded(:,:,3) = thresholded(:,:,1);
colorImage(thresholded == 0) = 0;
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