is there any way to draw a vertical and horizontal line that pass through blobs centroid ?

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Anandakumar Selvaraj
评论： Image Analyst 2014-3-3
I have a task of locating the upper lower and right and left cornet of a blob like this image where i have marked the points as red points
now i can plot centroid like this
s = regionprops(binaryImage, 'centroid');
centroids = cat(1, s.Centroid);
figure,imshow(binaryImage);hold(imgca,'on'); plot(imgca,centroids(:,1), centroids(:,2), 'r*','MarkerSize', 10, 'LineWidth', 3);
is it possible to find the other four points like drawing a line vertically and horizontally and some how find the intersecting points like this image and plot the four points
please help me any one ...i am not much good in math so code example will be helpful..
  1 个评论
Pradeeba
Pradeeba 2014-3-3
This is works only for 1 dimensional matrix. how it is suitable for binary image because it consists of only two values such as 0 and 1. if it is possible, please put up the code.

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回答（2 个）

Image Analyst
Image Analyst 2013-12-9
Round the centroid to the nearest integer row and column, then extract that and use find
centroidColumn = round(xCentroid);
centroidRow = round(yCentroid);
% Extract
oneColumn = binaryImage(:, centroidColumn);
% Get top and bottom row
topRow = find(oneColumn, 1, 'first');
bottomRow = find(oneColumn, 1, 'last');
% Extract
oneRow = binaryImage(centroidRow, :);
% Get left and right columns.
leftColumn = find(oneRow, 1, 'first');
rightColumn = find(oneRow, 1, 'last');
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Image Analyst
Image Analyst 2013-12-9
Does your image have a white boundary around it? It looks like it might. What are the values of topRow, etc.? I think you need to review this link first http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/

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Jos (10584)
Jos (10584) 2014-3-3
Here is one approach:
s = regionprops(binaryImage, 'centroid');
centroids = cat(1, s.Centroid);
columndata = binaryImage(:,centroids(:,1)) ;
ix = 1:numel(columndata)-1 ;
Ypos = find(columndata(ix) ~= columndata(ix+1))
Ypos = Ypos + [1 0] % correct for offset?
figure,
imshow(binaryImage);
hold on(imgca,'on');
plot(imgca,centroids(:,1), centroids(:,2), 'r*','MarkerSize', 10, 'LineWidth', 3);
plot(imgca, centroids(:,1),Ypos,'rs','markersize',10,'markerfacecolor','r') ;

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