Quantifying pore size distribution for a 3-d image

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ALI BAGHERI 2016-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/276869-quantifying-pore-size-distribution-for-a-3-d-image

评论： Image Analyst 2023-7-4

采纳的回答： Image Analyst

Quantifying pore size distribution for a 3-d image?

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Answer 1

Image Analyst 2016-4-3

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Threshold, then call regionprops().

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Enoch 2023-6-20

Can you explain what you mean?

I am learning how to carrying out analysis on 3D images and 2D stack images in MATLAB

Image Analyst 2023-6-20

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For example

mask = image3d < 50; % or some threshold value that works.
props = regionprops3(mask);

See my Image Segmentation Tutorial in my File Exchange:

Image Analyst's File Exchange

It's a generic, general purpose demo of how to threshold an image to find blobs, and then measure things about the blobs, and extract certain blobs based on their areas or diameters.

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Answer 2

Adriana 2023-7-4

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编辑：Image Analyst 2023-7-4

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Hello!

Quick question, I've created an aggregate of 1000 spheres with this code:

t = readmatrix('Sim 1.txt');
[xn,yn,zn]=sphere;
i=1;
while i<=1000
    for i=i
        x=t(i,1);
        y=t(i,2);
        z=t(i,3);
        r=t(i,4);
        
        xi=xn*r+x;
        yi=yn*r+y;
        zi=zn*r+z;
        
        p(i)=surf(xi,yi,zi);
        
        hold on
        i=i+1;
    end
end
hold off;

How can I now measure the pore size distribution of my aggregate (1x1000 surface)?

Thank you in advance!

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Image Analyst 2023-7-4

@Adriana If by "pore" you mean the spheres (like the spheres are voids/holes in a solid volume) then the pore side distribution is just 1000 counts of 1. Since you did not specify an input for sphere, it makes a sphere of radius 1 (diameter of 2).

Conversely, if the volume is void space and the spheres are solid, then you're going to have to define what you mean by a pore. You can get the distance of every pixel to the closest sphere with bwdist and then take the histogram of the distance transform image, if that will help you.

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