How to perform regionprops to specifically get object's centroid

Question

Bachtiar Muhammad Lubis 2019-1-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/441752-how-to-perform-regionprops-to-specifically-get-object-s-centroid

评论： Bachtiar Muhammad Lubis 2019-1-31

采纳的回答： Image Analyst

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

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Answer 1

Image Analyst 2019-1-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/441752-how-to-perform-regionprops-to-specifically-get-object-s-centroid#answer_358233

在 MATLAB Online 中打开

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