How to implement SEG (Wootton and Federhen ,1993) algorithm?

I want to implement SEG in my MATLAB environment and I’m relying on Wootton and Federhen (1993)
Reading the article I cannot succeed to understand what kind of process I have to implement in order to build my script. Specifically what kind of statistics I should follow to compute the complexity state and the repetition vector and what kind of procedure I have to do to calculate these statistics over the amino acid sequence.

Do you know some articles that explains in a better fashion what is needed, namely the mathematical process behind the results shown in the article? Code examples in other languages welcome.
Thank you in advance