Re: How to analyse a pattern of holes?
Posted by
Krs5 on
Aug 05, 2015; 7:44am
URL: http://imagej.273.s1.nabble.com/How-to-analyse-a-pattern-of-holes-tp5013892p5013898.html
I would measure the total number of pixels from the shot grouping. Make a maximal circle and decrease the circle diameter while measuring the shot grouping at each diameter. You could use something like
run("Select All");
run("Fit Circle");
run("Enlarge...", "enlarge=-25");
measure
The value -25 depends on the size of your image and how accurate the measurement has to be. You could do this till the value is < 95% and then enlarge with smaller numbers till the value has become >95% again.
Best wishes
Kees
Dr Ir K.R. Straatman
Senior Experimental Officer
Advanced Imaging Facility
Centre for Core Biotechnology Services
University of Leicester
http://www2.le.ac.uk/colleges/medbiopsych/facilities-and-services/cbs/lite/aif-----Original Message-----
From: ImageJ Interest Group [mailto:
[hidden email]] On Behalf Of BillyWu
Sent: 04 August 2015 21:40
To:
[hidden email]
Subject: How to analyse a pattern of holes?
Hi guys. I'm doing my MSc thesis and I'm using ImageJ software to look at measuring shotgun spread patterns. Basically, I have a white paper target that I've photographed and I know the dimensions of the paper. Setting the scale is easy :)
what I need to know is how can I use ImageJ to draw a circle of best fit around my shot grouping? I need to analyse it with image software rather than using my own interpretation, so if I could find a method that accounts for 95%> of my spread pattern and then fits a circle of best fit to it then that'd be perfect :)
Could anyone tell me how to do this please?
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