I have image processing toolbox 8.3 but still "imfindcircles" don't work. What can I do ?

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I need to detect circles in real time video for my project.
But every time I am trying to run "imfindcircles" function on my PC, I have encountered the following error. I have tried MATLAB 2012a, 2012b & 2013a for only this function but no result.
Even the example in the MATLAB help don't run!.
The error is:
Undefined function 'chaccum' for input arguments of type 'double'.
Error in imfindcircles (line 170) [accumMatrix, gradientImg] = chaccum(A, radiusRange, 'Method',method,'ObjectPolarity', ...
Please help me out

Accepted Answer

Image Analyst
Image Analyst on 20 Mar 2014
Try which:
>> which -all chaccum
C:\Program Files\MATLAB\R2014a\toolbox\images\images\private\chaccum.m % Private to images
What do you see when you do it?
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