How to find the center co-ordinates of different regions

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Tania
Tania 2015-5-11
评论： Tania 2015-5-11
Hi there,
Can anyone assist me how to find the center co-ordinates automatically and save the co-ordinate (x and y position) values in an array automatically? The shapes are different for the regions but each region has same pixel value.
Please have a look at my image and guide me how to find the center co-ordinates of each region and save them in an array automatically without using manual operation.
Any help will be highly appreciated.

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Image Analyst
Image Analyst 2015-5-11
编辑：Image Analyst 2015-5-11
I thought you'd seen it before, but I guess not. See my image segmentation tutorial in my File Exchange http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
Basically it's something like
grayImage = rgb2gray(rgbImage);
[labeledImage, numberOfBlobs] = bwlabel(grayImage ~= 0);
measurements = regionprops(labeledImage, 'Centroid');
allCentroids = [measurements.Centroid];
xCentroids = allCentroids(1:2:end);
yCentroids = allCentroids(2:2:end);
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Image Analyst
Image Analyst 2015-5-11
If you want to treat the black background as its own object, then you'll have to do that separately (well, that's the simplest and most straightforward way).
grayImage = rgb2gray(rgbImage);
[labeledImage, numberOfBlobs] = bwlabel(grayImage == 0);
measurements = regionprops(labeledImage, 'Centroid');
allCentroids = [measurements.Centroid];
xCentroids = allCentroids(1:2:end);
yCentroids = allCentroids(2:2:end);
Note the == 0 instead of ~= 0 so that we pick up only pure black pixels.

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