What are the correct usage/parameter values for HoughCircles in OpenCV for Iris detection?

Question

I\'ve been reading about the subject but cannot get the idea in \"plain English\" about the usage and parameters for HoughCircles (specially the ones after

Answer 1

My alternative suggestion is to use Threshold and Blob analysis. It more simple to detect iris than using canny edge and hough transform.

My way is... First you threshold it. Pick up any threshold value until the black and white image produce only (black color) iris and eyelashes.

Then separate the the iris and eyelashes by putting in blob analysis value min length at XX and min width at YY. The XX and YY value are the value of iris length and width.