MATLAB: How to locate blobs upper middle and lower middle points and plot it

binary imageblob analysiscentroidduplicate postimage processingImage Processing Toolbox

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);

Best Answer

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

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MATLAB: How can i get each coordinates of binary image

Find the centroid with regionprops(). See my Image Segmentation Tutorial if you don't know how. Then convert the centroid to integer to get the row and column.

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.

MATLAB: How to middle

If you have only circle on the image like below

clc,clear
I = imread('img.png');
I1 = im2bw(I,graythresh(I));        % binarize image (0,1)
[row, col] = find(I1);              % find white pixels (1 value)
ix = round( mean(col) );            % mean column
iy = round( mean(row) );            % mean row
imshow(I1)
hold on
plot(ix,iy,'or')
text(ix+10,iy+10,'CircleCenter')
hold off

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MATLAB: How can i get each coordinates of binary image

MATLAB: How to middle

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