Real-time Foreground-Background segmentation using codebook model by Kyungnam KIm

Can anyone please help me writing a code for codebook model for background-foreground segmentation on image sequence? I've read the paper about it in: "Real-time Foreground-Background segmentation using codebook model by Kyungnam KIm".

I am a beginner in image processing and also using MATLAB therefore I have no idea how to write the code for my research.

I am trying to write based on my understanding following the guideline on that

Thank you .