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I am trying to detect circles road signs and I have some issues.

1.- The HoughCircles function detect circles in a gray image, however with the same parameters but the image binarized(the circle is still perfectly visible) it does not detect any circle, i do not why but with a binarized image it fails a lot, any idea why this issues with binary images?

2- to try to correct that i put the dp parameter in 2, and changed the threshold, in the binary image now i detect circles, but it also gives me a lot of false positives, i do not understand what it is the dp parameter or how to use it

3.- If you tell me that there is no way to make it work, i would like to know if there is any other way of detecting circles in an image.

crosspost:http://stackoverflow.com/questions/29732013/is-there-other-methods-to-detect-circle-apart-of-houghcircles

thanks a lot for your help

I am trying to detect circles road signs and I have some issues.

1.- The HoughCircles function detect circles in a gray image, however with the same parameters but the image binarized(the circle is still perfectly visible) it does not detect any circle, i do not why but with a binarized image it fails a lot, any idea why this issues with binary images?

2- to try to correct that i put the dp parameter in 2, and changed the threshold, in the binary image now i detect circles, but it also gives me a lot of false positives, i do not understand what it is the dp parameter or how to use it

3.- If you tell me that there is no way to make it work, i would like to know if there is any other way of detecting circles in an image.

crosspost:http://stackoverflow.com/questions/29732013/is-there-other-methods-to-detect-circle-apart-of-houghcirclescrosspost on stackoverflow

thanks a lot for your help