imfindcircles not giving answer

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Pat le 6 Fév 2014

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https://fr.mathworks.com/matlabcentral/answers/115062-imfindcircles-not-giving-answer

I want to find circles in a image,i used imfindcircles ,and used example in it which gave good result,but if i use my own image i am not getting the result,kindly assist

rgb=imread('sample6.bmp');
%rgb=~rgb;
[centers, radii] = imfindcircles(rgb,[10 55],'ObjectPolarity','bright')
imshow(rgb)
 viscircles(centers, radii,'EdgeColor','b');