Automatically Selecting a Circle

Posted by Andrew Sanchez on May 22, 2015; 9:51pm
URL: http://imagej.273.s1.nabble.com/Automatically-Selecting-a-Circle-tp5012920.html

I am trying to automate the task of manually selecting a circular area.

The circle I need to select is very apparent and has fairly thick white
borders.  I am wondering if ImageJ can recognize the circle.

Unfortunately, the size and location of the circle varies slightly from
image to image.

Is it possible for ImageJ to recognize a large circle in my images, and to
select and crop that area?

The ultimate goal is to then count the number of green pixels within the
circle.

Thank you,
Andrew Sanchez
Lab Assistant
Center for Ecosystem Science
Northern Arizona University

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