Circularity evaluation on image

Question

Niccolò de Cesare 2017-5-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/339416-circularity-evaluation-on-image

评论： Niccolò de Cesare 2017-5-9

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Hi everybody,

i've a question on Circularity evaluation of the image below.

This is a test image on which i'm working:

And this is the code:

 close all
 clear all
 I=imread('Cerchio2.png');
 I=rgb2gray(I);
 imshow(I)
 th = graythresh(I);
 IcropEqTh = im2bw(I,th);
 imshow(IcropEqTh)
 stats = regionprops(IcropEqTh,'Area','Perimeter','Solidity','MajorAxisLength','MinorAxisLength','Orientation');

So, in the image i've two forms, a circle and an ellipse, in the "stats" vector i get only one value for each parameter but in the figure there are two forms and i expect to get two values for each parameter. Why this?

There's a method to evaluate on the same image the parameters for each forms?

Thanks in advance

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Answer 1

KSSV 2017-5-9

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/339416-circularity-evaluation-on-image#answer_266234

在 MATLAB Online 中打开

close all
clear all
I=imread('Cerchio2.png');
I=rgb2gray(I);
imshow(I)
th = graythresh(I);
IcropEqTh = im2bw(I,th);
for i = 1:2
    Icrop = imcrop(IcropEqTh) ;
    imshow(Icrop)
    stats(i) = regionprops(Icrop,'Area','Perimeter','Solidity','MajorAxisLength','MinorAxisLength','Orientation');
end

Crop the area when prompted, First crop for circle and then ellipse.

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Niccolò de Cesare 2017-5-9

I could do it for this test image, but for the final work i should do it on a image with a cellular population and it's impossibile because cells are too many. I would like to have an automatic process.

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