how to find different features of objects

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Abo
Abo 2015-5-14
评论： Image Analyst 2015-5-14
in this binary image there are some objects in x-y coordinate, I want to find the biggest object and its centroid (x,y). how can I do that?

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Image Analyst
Image Analyst 2015-5-14
See my Image Segmentation Tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 It finds the centroids of a bunch of circles.
Then, see my attached demo that will find the largest or smallest N blobs in a binary image.
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Abo
Abo 2015-5-14
thank you very much for your answer, I've used this method before, for selecting the biggest object but I cannot to find centre of that one. you know the biggest object is ellipse not circle.
Image Analyst
Image Analyst 2015-5-14
There are several ways. For example, you can first call my function that returns only the largest blob. Then you can call bwlabel() and regionprops().
%----------------------------------------------------------
% Extract the largest area using our custom function ExtractNLargestBlobs().
biggestBlob = ExtractNLargestBlobs(binaryImage, numberToExtract);
%---------------------------------------------------------
labeledImage = bwlabel(biggestBlob);
measurements = regionprops(labeledImage, 'Centroid');
centroid = measurements(1).Centroid;
I think maybe you looked only at the ExtractNLargestBlobs demo and did not look at the demo in my File Exchange - they are different. I attach both here.

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