The relative vertical position of the smallest connected black component

Hi guys.... I want your help in MATLAB to find the vertical position of the smallest connected black component.

Answer 1

[Sean de Wolski]

CC = bwconncomp(~BW);
[junk, idx] = min(cellfun(@numel,CC.PixelIdxList))
[r c] = ind2sub(size(BW),CC.PixelIdxList{idx});
%How do you want to define vertical position? Middle, top bottom
mean(r); %middle by weight
min(r);  %top point
max(r);  %bottom point