Boundary of an image

Asked by Sivakumaran Chandrasekaran on 27 Jul 2012

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Hi, How to mark boundary of an image. My given input image is collection of trees and my work is to count the no. of trees. I found the boundary line for each and every tree.. Boundary drawn looks like star shaped.. But i need it in the form of circle..

one circle per tree.

how to do this.

Regards, Siva

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Yash on 27 Jul 2012

regionprops will work

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Answer by Ryan on 27 Jul 2012

Edited by Ryan on 27 Jul 2012

Utilize the matlab function regionprops(...,'MajorAxisLength'). This will return the diameter of a circle needed to enclose a region. You could also utilize regionprops(...,'BoundingBox') and use the maximum of the height/width as the diameter of the circle. You could then use the center of the 'BoundingBox' or 'centroid' to place the circles accurately for visualization puproses.

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