What is the underlying code for the 'imfindcircles' function?

I'm currently working on a computer vision project to measure the radii of silica microspheres based on scanning electron microscope images that I've taken. Previously, I've been using Python's openCV package to do the detection work but I find that the Matlab imfindcircles function works much better for my project. However, from what little I've read online, I understand that it is essentially operates using Hough transformation. That really surprises me because I was not able to get the same microsphere detection results with openCV's HoughCircles function.

Is there any way that I can see the underlying code for the imfindcircles function? I'm quite curious with regard to how they've implemented this function.

Thank you for your help.

[erfan khosravani]

I have the same problem. I will be very thankfull if you solve this problem and optimize the Python's openCV package. Would you please let me know the result?

Answer 1

[Walter Roberson]

dbtype imfindcircles

In particular look somewhere near line 169, starting at "%% Compute the accumulator array". It calls %CHACCUM Compute 2D accumulator array using Circular Hough Transform. You can read the source for that,

dbtype(cell2mat(which('-all','chaccum')))

[Sandip Roy]

Thank you for your help and for responding so quickly!

[V Acer]

Excuse me. I use "open imfindcircles" command to open the .m file, but I can't find the function chaccum in it and "open chaccum" command doesn't work. So which situation do I need to use the "open(cell2mat(which('-all','***(function_name)')))" command.Is there any rule?

[DGM]

Look under .../toolbox/images/images/private/

at least that's where it is in R2019b

[V Acer]

THANKS!!!!!!