hough ellipse fit inaccurate?

[Johannes Schoenberger]

Well, there is not reason to use `fit ellipse` from OpenCV, you can use `skimage.measure.EllipseModel`.

> On Mar 5, 2015, at 5:38 PM, Kevin Keraudren <kevin.keraudren at googlemail.com> wrote:
> 
> 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/_hough_transform.pyx
> 
> 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
> 
> 
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