Circle detection in CTscan

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Peter To
Peter To on 7 Apr 2014
Edited: Julia on 16 Apr 2015
Dear specialists, Currently, I have to detect some circles from CT scan images. The sample is as below
The radius range is from 5-110, so I tried to divide this range into several smaller intervals. However, the results is not adequate. Could anybody please help me to detect them ? Thank you very much.
  2 Comments
Peter To
Peter To on 7 Apr 2014
Sorry, I forget to mention that I use imfindcircles command. This command advices rmax <3*rmin and rmax-rmin <100.
Spandan Tiwari
Spandan Tiwari on 11 Apr 2014
Did you try changing the Sensitivity parameter in imfindcircles? Can you show the code you used?

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Accepted Answer

Image Analyst
Image Analyst on 7 Apr 2014
Did you try imfindcircles()?
  11 Comments
Image Analyst
Image Analyst on 12 Apr 2014
The standard deviation filter did a pretty good job on the bigger circles. See attached m-file.
Peter To
Peter To on 14 Apr 2014
It is awesome, I will study your code right now. Although this code cannot detect the small circles, it helps me to start over. Thank you very much.

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More Answers (1)

Julia
Julia on 15 Apr 2015
This code looks really useful. I tried to use it for the detection of pores in the attached picture. As you can see, especially in the center, the pore spaces are widely connected, so a distinction would be needed. Basically i would like to fit in circles into the pore spaces to get a pore size distribution. Using your proposed code as it is does not help in this case. Could you suggest which parameters to play with in order to make it fit better for less obvious cases like mine?
  2 Comments
Image Analyst
Image Analyst on 15 Apr 2015
There is no picture attached. I suggest you start a new question with it. You can reference this one if you want.
Julia
Julia on 16 Apr 2015
Edited: Julia on 16 Apr 2015
I attached the picture. I will also start a new question. Thanks. http://www.mathworks.com/matlabcentral/answers/203771-detect-highly-connected-pores-in-a-ct-scan

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