Estimate curvature

I have to implement this method on Page 42

http://www.global-edge.titech.ac.jp/faculty/hamid/courses/shapeAnal...

Here is the dataset :

Dragon dataset of http://graphics.im.ntu.edu.tw/~robin/courses/cg03/model/

The output should look like Page 44 on above pdf file. 

I am having problem to code it in C++. Can anyone code it for me in C++ or provide some psedocode for me to start. Any help appreciated! Thanks!