How to do a hair segmentation?

Hi, I'm currently learning how to use Matlab right now. And I have my last final project in my education to make a system who can make a segmentation for gender classification based on hair. Is there any link where I could read or code to see to make a hair segmentation? Currently, I'm using viola jones to detect upper body to get full hair, and still I don't know the next step to do a hair segmentation, please help me.