Circle reconstruction algorithm

Hello. I have binary images with circle segments, and non circle segments. You can see one of them here: http://www.pictureshack.ru/images/6487111.jpg this is a part of a circle. Can anyone advise me an algorithm which can reconstruct full circle from image like this? But algorithm input also can be an image with segment which sholdn't be interpretted like circle.

Answer 1

[David Young]

Have a look at the circle-finding demo that comes with the Image Processing Toolbox, and also look at circle-finding contributions to the FEX, which mainly use the Hough transform.