How to find the land mark points in a hand image????

I am new to Matlab and doing a project on hand geometry. I am at the feature extraction stage! I got the boundary of the hand image! now I have to find the landmark points i.e. the fingertip points in my image! And I want a code for that or an understanding of how it can be done! Here is my image http://tinypic.com/r/2lmqna1/6 . I have to make use of the "border following algorithm". Please help me asap as I am running out of time! I would be grateful!

[Walter Roberson]

bwtraceboundary ?

Answer 1

[Image Analyst]

What does it look like if you fill the hand with poly2mask() and then skeletonize it with bwmorph()?