How to determine if the curve is closed?

1

Hi all,
I want to find the markers in CT scout. Is it possible to determine if the curve is closed?

2

Which markers? What curve? Please provide more details.

3

Thanks.
The application is surgical navigation. The marker is made from round aluminum sheet. The marker is like a circle in the CT scout. I want to find them from the scout. I used the Canny Edge detection method. It found many curves. Among the curves, the closed curve I thought is the marker. So I want to know is it possible to determine if the curve is closed ? Or maybe are there any better segmentation methods to find the marker ?

4

Hough transform might be of interest to you. ITK’s implementation is called HoughTransform2DCirclesImageFilter.