rgbImage=imread('ban.jpeg');
subplot(121),imshow(rgbImage);
grayImage=rgb2gray(rgbImage);
[segment,blackSpots]=bwlabel(~im2bw(grayImage,0.7));
% Choose the threshold as per requirements
total_bk_spots=blackSpots-1
%................^ minus 1 for ignoring largest blobbs
subplot(122),imshow(segment);
If not, then do the color thresholding.
