3. Contour extraction: drawbacks of existing solutions

Snakes - locking onto high gradient areas in the image.

Problems: - Need initial guess.

- Gradient value between soft tissue and

air is high enough that it will lead to locking onto wrong contours (soft tissue).

Region growing:

Problems: a. Need initial guess.

Edge detection :

* Zero-crossings, Canny.

Problems: Experimental results show over or

under segmentation.

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