determining the edges of the money image with red color

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betty on 1 Jan 2022
Commented: Image Analyst on 1 Jan 2022
how can I draw the edges of the money image below in color? I'm trying the following code, but it doesn't work
A = imread('eight.tif');
[centers,radi] = imfindcircles(A,[20 25]);
viscircles(centers, radi,'Color','r');

Accepted Answer

Simon Chan
Simon Chan on 1 Jan 2022
Edited: Simon Chan on 1 Jan 2022
It is better to ask imfindcircles to find all the dark circles and adjust the range of radius.
In your case, the range is too small and imfindcircles cannot find any circle for you.
Try the following
[centers, radi] = imfindcircles(A,[20 50],'ObjectPolarity','dark')

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