imfindcircles not giving answer

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Pat
Pat 2014-2-6
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');
image is http://imgur.com/DY0okYS

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