I spent too much time on the parallel curve.
It seems very simple.
so when I can't finish it perfectively , I feel so sad...
Today, I check many papers to find that no one can do it perfectly for any situation and any image.
Many professors and Doctors do it many years to improve their work...
I feel happy about that there are so many people stand with me...^_^.I am not alone.
In scientific field , there are no problem can be solved perfectly.
We just can get a better answer under special situation and presumption..
What I need learn is to grasp the most important thing and find the nearer way to get the goal.
Although it's not perfect, but it can be better and better.