how to locate blobs upper middle and lower middle points and plot it

Question

Anandakumar Selvaraj 2013-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/108988-how-to-locate-blobs-upper-middle-and-lower-middle-points-and-plot-it

编辑： Anandakumar Selvaraj 2014-1-8

i am trying to locate points like it shows in the figure 4 below were the centroid i have marked as shown in figure 2 from the binary image now i have to mark upper lower and left and right boundry point as in fig 4 ..any one help me

I have marked the centroid of the blob using

s = regionprops(binaryImage, 'centroid');
centroids = cat(1, s.Centroid);            
imshow(binaryImage);
hold(imgca,'on'); 
plot(imgca,centroids(:,1), centroids(:,2), ...
   'r*','MarkerSize', 10, 'LineWidth', 3);

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Answer 1

Image Analyst 2013-12-9

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https://ww2.mathworks.cn/matlabcentral/answers/108988-how-to-locate-blobs-upper-middle-and-lower-middle-points-and-plot-it#answer_117777

I answered this in your duplicate question: http://www.mathworks.com/matlabcentral/answers/109002#answer_117775

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Anandakumar Selvaraj 2014-1-8

编辑：Anandakumar Selvaraj 2014-1-8

在 MATLAB Online 中打开

The answer to my question is already answered by Image Analyst in Ths Post

 centroidColumn = int32(centroid(1)); % "X" value
centroidRow = int32(centroid(2)); "Y" value.
Then extract a row or column and use find to find the first and last element that's set:
 middleColumn = binaryImage(:, centroidColumn);
topRowY = find(middleColumn, 1, 'first'); % Find top.
bottomRowY = find(middleColumn, 1, 'last'); % Find bottom.
middleRow = binaryImage(centroidRow, :);
leftColumnX = find(middleRow, 1, 'first'); % Find left.
rightColumnX= find(middleRow, 1, 'last'); % Find right.