get the inner white circle
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Elysi Cochin
il 1 Feb 2016
Commentato: Walter Roberson
il 1 Feb 2016
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/153730/image.png)
i wanted to get the inner white circle and blacken all the remaining portions....
please can someone help me solve this...
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/153731/image.png)
i am trying to get such an image.... but not getting... please help...
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Walter Roberson
il 1 Feb 2016
regionprops() 'BoundingBox' would give you the bounding box without any problems. You could also request the 'Eccentricity' and use that to choose between the two output regions. You might also want the 'Image' property.
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Walter Roberson
il 1 Feb 2016
regionprops() is going to give you a structure array of length 2. You can examine the properties returned to decide which of the two each one refers to.
If you have a newer version of MATLAB, R2014b or later, you can use bwareafilt() and ask to keep the 1 'smallest'
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