Circle detection in CTscan

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Peter To 2014-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/124753-circle-detection-in-ctscan

编辑： Julia 2015-4-16

采纳的回答： Image Analyst

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.

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Peter To 2014-4-7

Sorry, I forget to mention that I use imfindcircles command. This command advices rmax <3*rmin and rmax-rmin <100.

Spandan Tiwari 2014-4-11

Did you try changing the Sensitivity parameter in imfindcircles? Can you show the code you used?

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Image Analyst 2014-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/124753-circle-detection-in-ctscan#answer_132563

Did you try imfindcircles()?

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Image Analyst 2014-4-12

test.m

The standard deviation filter did a pretty good job on the bigger circles. See attached m-file.

Peter To 2014-4-14

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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Julia 2015-4-15

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original.jpg

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?