Median variance in background subtraction

Question

I am facing some issues in implementation of the paper Statistical Background Subtraction for a Mobile Observer.

Question 1:

In Sec

Answer 1

Nice breakdown of it here: http://blog.damiles.com/2009/03/the-basics-of-background-substraction/

Its also in the opencv book.

code in opencv2 here: Background subtraction in opencv2

Answer 2

Question 1, first option, "Should the median of first model's variance across all the pixels for that frame be taken?".

Yes, it assumes that the variance of the background pixel is lower than the foreground. So the median of all variances will give acceptable variance for the background.