See presentation (measuring glue area.pdf) in SLAC ITk meeting on 10/6/20 (https://indico.cern.ch/event/960662/). Commands used in recent studies are on page 8:
im = imread("Image/cropped.png");
imshow(im);
h = imdistline;
gs = rgb2gray(im);
inv = imcomplement(gs);
a = inv >100;
cc = bwconncomp(a);
st = regionprops(cc);
<sort st in descending order in Area>
centroid = cat(1,st.Centroid); hold on;
imshow(a);
plot(centroid(1:1,1),centroid(1:1,2),'b*');
plot(centroid(2:2,1),centroid(2:2,2),'b>');
plot(centroid(3:3,1),centroid(3:3,2),'b<');
hold off;