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How to measure circularity??

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Nisreen Sulayman
Nisreen Sulayman 2014-12-20
回答： yousra zafar 2019-11-21
How to measure circularity ? What is wrong in this code?
CC=bwconncomp(BW); %BW binary image
labeled=labelmatrix(CC);
stats = regionprops(CC, 'all');
stats.circularity = ((stats.Perimeter) .^2 )./ (4*(pi*(stats.Area)))
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Nisreen Sulayman
Nisreen Sulayman 2014-12-21
what are the all possible features I can use to pick the smallest circular-like component ??

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采纳的回答

Image Analyst
Image Analyst 2014-12-20
You didn't use brackets. Try it this way
allPerimeters = [stats.Perimeter];
allAreas = [stats.Area];
allCircularities = allPerimeters .^ 2 ./ (4 * pi* allAreas);
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Image Analyst
Image Analyst 2014-12-22
You're welcome. My email is not necessary.
Hossain Md Shakhawat
Hossain Md Shakhawat 2016-11-20
How can I find the glcm features for the detected blobs.

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更多回答（6 个）

Matt J
Matt J 2014-12-21
It might also be useful to check whether the Eccentricity and Solidity of a region are above a certain threshold.
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Image Analyst
Image Analyst 2014-12-22
You can look at my code in my answer where the blobs are labeled with their number in the first figure, and then each blob is cropped out to a separate image with the blob number in the title above the blob.
Nisreen Sulayman
Nisreen Sulayman 2014-12-22
编辑：Nisreen Sulayman 2014-12-23
thank you very much ... thank you

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Nisreen Sulayman
Nisreen Sulayman 2015-1-19
Hi Mr. Image Analyst,
I am working on the code that you have written "test.m", I want to display more properties of the blobs in the image ... 'MajorAxisLength', 'MinorAxisLength', 'Orientation' ... After that I want to copy these values to a doc file
I have modified the code but it didn't work
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Image Analyst
Image Analyst 2015-1-21
First segment the image to get a binary mask of that thing. Then mask it
red = grayImage;
red(mask) = 255;
green = grayImage;
green(mask) = 0;
blue = grayImage;
blue(mask) = 0;
rgbImage = cat(3, red, green, blue);
imshow(rgbImage);
Nisreen Sulayman
Nisreen Sulayman 2015-1-22
Thank you very much Mr. Analyst,
I am grateful for your help.

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Nisreen Sulayman
Nisreen Sulayman 2015-1-19
I have apllied the code. How can I display the round objects in the original images in different color instead of drawing a circle around them???
Nisreen Sulayman
Nisreen Sulayman 2015-1-29
编辑：Nisreen Sulayman 2015-1-29
How can I index images according to the resulted segmented image? Is there any thing related to build a database using MATLAB?
Any example or link about this?
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murk hassan memon
murk hassan memon 2018-4-4
stats.circularity = ((stats.Perimeter) .^2 )./ (4*(pi*(stats.Area))) i am getting an error of this sign ^ as such the error is too many input argument.. is there any other method to find the circularity ? if yes? then kindly help me out
Matt J
Matt J 2018-4-4
@murk,
You have multiple objects in "stats" so you need to do something like,
result = ([stats.Perimeter] .^2 )./ (4*(pi*[stats.Area]))

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Souhardya Roy
Souhardya Roy 2018-7-6
The formula is inverse of what is given.
  2 个评论
yousra zafar
yousra zafar 2019-11-19
can you share the code for finding circular objects . i am also working on aneurysm detection. any guidance from your side will he highly appreciated

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yousra zafar
yousra zafar 2019-11-21
i,m unable to run the code text.m attcahed above, getting error : file not found , can you share with me the image C:\Users\Rose\Documents\Temporary\im.jpg

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