connected_components_in_img

BW = cat(3, [1 1 0; 0 0 0; 1 0 0],...
            [0 1 0; 0 0 0; 0 1 0],...
            [0 1 1; 0 0 0; 0 0 1]);
            
            
CC = bwconncomp(BW)


S = regionprops(CC,'Centroid')


BW = imread('text.png');
imshow(BW)


CC = bwconncomp(BW)


numPixels = cellfun(@numel,CC.PixelIdxList);
[biggest,idx] = max(numPixels);
BW(CC.PixelIdxList{idx}) = 0;


figure
imshow(BW)