to find the ROI surrounding the centroid

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I have an image that has several objects in it. I have found the centroid of one of the desired objects in them. I want to create ROI surrounding this centroid alone and make other objects zero or null.

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Image Analyst
Image Analyst 2013-6-1
Like I said in your question last month (that you accepted - thanks), that's covered in my Image Segmentation Tutorial. If you don't think it does, the post your code and show why not.
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Image Analyst
Image Analyst 2013-6-2
Perhaps you might want to use the convex hull by using bwconvhull(). Feel free to adapt my code. I've given you a good start, but I'm not going to do the whole project for you. Good luck.
BV
BV 2013-6-2
编辑:BV 2013-6-2
thank you once again) bwconvhull()doesnt work that well. I have a centroid position.I want to create a rectangle of a particular dimension sround this centroid. Is there any function to do make a rect around the centroid? I don know how to use the centroid in 'imrect()'.

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