[Insight-users] a question about boundary points extraction

[zhao]

Hi Luis,
	
	How to extract the boundary points sequentially from a labeled region. Is there any API in ITK can do this?
	
	Does ITK have a Neighborhood class that allow users access neighborhood pixels clockwise(in 2-D image; either 4-N ro 8-N), which I think will be very useful for boundary extraction?
	
	In my program, I want to extract the boundary information from a segmented/labeled region to draw and to store for later use. 
	
	Thanks!

Zhao

Zhao ChenGuang
P.O.Box:010,
Dept. BME,
Shanghai Jiao Tong University,
1954# Hua Shan Road,
Shanghai,P.R.China,
200030