I am doing Background subtraction with Altera DE2 and Terasic D5M camera.
i want to use Frame difference algorithm but i have problem.
please help me if you know how to do that.

the formula is
| I_frame I_background| > Th
then update background is
B(i + 1)= α * F(i)+ (1 - α) * B(i)
but it's not work for me