How to perform regionprops to specifically get object's centroid

i have a vector row like this :

A = [1;1;1;0;0;0;0;0;1;1;0;0;1;1;1;1;0;0;0;0;1;1;1];

And use regionprops function to retrieve the centroid of 0's values.

props = regionprops(A==0, 'Centroid');

xyCentroids = [props.Centroid];

Now xyCenroids variable has indices of all 0's centroids.

How to retrieve the indices of 0's Centroids that only have length more than 2 ? So that the smallest 0's area (like A(11:12,1)) won't pass the process.

Thanks before

Answer 1

[Image Analyst]

That's not a row vector. It's a column vector. Anyway, try using bwareafilt():

A = [1;1;1;0;0;0;0;0;1;1;0;0;1;1;1;1;0;0;0;0;1;1;1]
% Extract blobs only of length 3 or longer.
blobs = bwareafilt(A == 0, [3, inf])
% Measure centroids
props = regionprops(blobs, 'Centroid');
xyCentroids = vertcat(props.Centroid)
yCentroids = xyCentroids(:, 2)

You'll get

yCentroids =

6

18.5

[Bachtiar Muhammad Lubis]

@ Image Analyst : Thank you so much sir. Always

[Bachtiar Muhammad Lubis]

@ Image Analyst : sorry sir i was mistake, yes it's collumn vector.