(a)	(b)	(c)
(d)	(e)	(f)

Segmentation of a torus with 3-D HMM. The figure shows 3 sections one each in the X-Y, Y-Z, and X-Z planes.   (a)-(c) is the original image, (d)-(f) is the segmented image. The parameters are a = 5, c = 25, and sigma = 0.5. The error rate is 12.8%.