Re: hough ellipse fit inaccurate?

Hi Arno, Looking at the code, I would ask: Did your score improve by setting accuracy=1 ? https://github.com/scikit-image/scikit-image/blob/master/skimage/transform/_... Considering that you are asking for accuracy below half a pixel, I would not be surprised if the voting process of the Hough transform is not that accurate. A least-square fitting (Opencv fitellipse) might be more accurate than a voting process for a perfect ellipse. Aren't the eyeball and the pupil both balls? If you slice them in any way, wouldn't you obtain disks? So why detecting elllipses and not circles? Maybe hough_circle will be more accurate. Sorry I cannot provide any proof or certitude on how accurate hough_ellipse is. Kind regards, Kevin