Measure circle radius in multiple images and output data in csv file

Question

Nick 2021-9-26

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评论： Nick 2021-9-27

Hi everyone,

I have thousands of images (most image has a single circle, a few have 2-5 circles with different radius). I would like to measure the radius in each image and output their radius value in a csv or txt tile. I am using the imfindcircles function currently, but I am manually measuring each picture and copying the radius to an Excel file. Here is my current code:

rgb = imread('XXX.jpg');
imshow(rgb)
[centers,radii] = imfindcircles(rgb,[10 300],'Sensitivity',0.85);
imshow(rgb)
h = viscircles(centers,radii,'color','b');

Could someone show me how to revise the code to let it automatically read all the images in my folder and output the values in a csv file? Thanks a lot!

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Answer 1

yanqi liu 2021-9-26

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sir, may be you want to loop the folder and get result to csv file

the follow is the ref code, please modify it

your_folder = 'please update this to your folder';

files = ls(fullfile(your_folder, '*.jpg'));

res = [];

for i = 1 : size(files,1)

filei = fullfile(your_folder, strtrim(files(i,:)));

rgb = imread(filei);

%imshow(rgb)

[centers,radii] = imfindcircles(rgb,[10 300],'Sensitivity',0.85);

%imshow(rgb)

%h = viscircles(centers,radii,'color','b');

res{end+1} = [centers radii(:)];

end

xlswrite('res.csv',res)

you can read the book 《计算机视觉与深度学习实战》

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Nick 2021-9-27

Thank for your help yanqi! The code works for my images! :)

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Answer 2

Image Analyst 2021-9-26

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https://ww2.mathworks.cn/matlabcentral/answers/1460784-measure-circle-radius-in-multiple-images-and-output-data-in-csv-file#answer_795074

Nick, it really depends on how hard it is to find your circles. You forgot to attach your image so I can't see it. It could be you can simply threshold, like I do in my Image Segmentation Tutorial where I find circles:

Image Analyst's File Exchange

To process a sequence of files, put your code to analyze a single image in a loop as shown in the FAQ:

https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

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Nick 2021-9-27

Thanks for the attached websites! I will attach a image next time asking a question. Really appreciate it ! I tried yanqi's code and it works for my images!

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