Posted by
MODEL, MICHAEL on
URL: http://imagej.273.s1.nabble.com/Draw-circle-around-point-tp5011114p5011115.html
You can use Distance Map (Process-Binary) based on the surface and see where your point lies.
Mike Model
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From: ImageJ Interest Group [mailto:
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Sent: Wednesday, January 07, 2015 12:35 PM
To:
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Subject: Draw circle around point
Dear ImageJ Forum,
Despite intensive googleing and searching within this forum, I have not found a solution to my problem yet.
My task is to find find out the shortest distance between a point and an irregular surface. I wanted to do this as follows:
Draw a circle around the point (meaning the point is the middle point of the
circle) and keep on drawing (hold left mouse button) as long as the circle hits the surface somewhere (release left mouse button).
Then measure the radius of the circle ("Analyze" -> "Measure"). The measured distance (radius) should be equal to the shortest distance between that point and the surface.
At first, I tried it with the built-in ellipse/circle tool in ImageJ but the problem is that ImageJ does not draw the circle from the middle point
(concentrically) but from the top.
Then, I found the concentric circle macro on the internet. The problem with this tool is, that it only draws circles with pre-defined radii. This does not work for me, as the radius of the circle is the unkown variable I want to measure.
According to my understanding, the best solution would be a cicrle tool (like the built-in) which lets you draw a circle from the center.
I hope my problem is understandable. I would appreciate your help very much.
Thank you!
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