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imfindcircles: How to store the center coordinate of the circles when using the function in a for loop?

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Misha Patel 2017-6-27

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编辑： Misha Patel 2017-6-29

The center is saved as a double (3X2)

How can I save the coordinates at the end of each loop without overwriting it?

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Gopichandh Danala 2017-6-28

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编辑：Gopichandh Danala 2017-6-28

在 MATLAB Online 中打开

I am assuming that you have multiple images and you repeatedly find the centers of circles in an image and loop through all the files in the folder or something like that.

If so, you can just create an empty cell of the length of files you have and copy centers of each file into a cell.

% Ex:
cell2StoreCenters = cell(1,length(files)); % empty cell
for i = 1:length(files)
    [centers, radii, metric] = imfindcircles(edgeICoinImage2,[50 150],'ObjectPolarity','dark','Sensitivity',0.90);
    cell2StoreCenters{i} = centers;
end

Rik 2017-6-28

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在 MATLAB Online 中打开

Don't forget to fix the typo:

cell2StoreCenters = cell(1,length(files)); % empty cell

Gopichandh Danala 2017-6-28

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Thanks Rik, corrected

Misha Patel 2017-6-29

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编辑：Misha Patel 2017-6-29

Hello, Thanks for the help. This does successefully create a cell to store data but it seems to store the centre coordinates of the last image multiple times rather than storing each round of data.

Misha Patel 2017-6-29

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编辑：Misha Patel 2017-6-29

在 MATLAB Online 中打开

for k= 1:5
%Read image
pngFilename = strcat(num2str(k), '.png');
imageData = imread(pngFilename);
thisImage = imcrop(imageData,[550 40 1200 1100]);
%show Image
figure, imshow(thisImage);
% empty cell
cell2StoreCenters = cell(1,5);
%imfindcircles function
[centers, radii] = imfindcircles(thisImage,[10 15], 'ObjectPolarity','bright', ...
        'Sensitivity',0.87,'Method','twostage')
thisImageResults= centers;      
cell2StoreCenters{1,k} = thisImageResults;
%Draw dark and Bright circles
h = viscircles(centers,radii);
end

This creates a 1X5 array but only stores the last set of data in the last cell. All other cells are empty

Rik 2017-6-29

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You put this line inside your for-loop: cell2StoreCenters = cell(1,5);

That clears your variable each loop. Place that line of code outside your for-loop and it should work.

Misha Patel 2017-6-29

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