Automatic Graph Cut method

I want to separate the clouds form the sky using the automatic graph cut method. Can anyone please help me. I read a paper which says we need to identify the hard constrained seeds first but I am unable to understand that. I am attaching the paper and a sample image here

Answer 1

[Image Analyst]

Yes. The Mathworks will help you. It's too much work for the rest of us to do for free. The Mathworks will read that paper and program it up for you. Start here with this link: https://www.mathworks.com/services/consulting.html?s_tid=hp_ff_t_facility

[skyimager]

Could you show me a way to do it myself? Some light into the dark path?

[Image Analyst]

Sorry - I've never used the graph cut method personally.