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Hi everyone, I have a problem that I do not understand as below: I write a program to detect the circle, my goal is detect it in binary (only black and white) image. I read some example and I can use Houghcircle to detect the circle but only on gray image, in binay image I can not. Can you help to explain and solve my problem. Thank you!

Hi everyone, I have a problem that I do not understand as below: I write a program to detect the circle, my goal is detect it in binary (only black and white) image. I read some example and I can use Houghcircle to detect the circle but only on gray image, in binay image I can not. Can you help to explain and solve my problem. Thank you!