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Kfir

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08 Aug 2011 Detect circles with various radii in grayscale image via Hough Transform Detect circular shapes in a grayscale image. Resolve their center positions and radii. Author: Tao Peng

For some reason, I can't get this to work. I can get the 'accum' matrix and can visually find the local maxima, but the 'circen' and 'cirrad' remain empty.
Any suggestions as to what I should do or which parameters I need to experiment with?
(and I get an error message many times:
"??? Undefined function or method 'filtfilt' for input arguments of type 'double'.

Error in ==> CircularHough_Grd at 606
    SgnCv = filtfilt( fltr4SgnCv , [1] , SgnCv );"

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