Gaussian filter
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
90
0
0
0
0
0
0
0
0
0
0
0
0
0
0
90
90
90
90
90
0
0
0
0
0
90
90
90
0
90
0
0
0
0
0
90
90
90
90
90
0
0
0
0
0
90
90
90
90
90
0
0
0
0
0
90
90
90
90
90
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
2
1
2
4
2
1
2
1
This filter H is a good approximation to
Properties of Gaussian
•
more weight to the center
•
good model of blurring in optical systems
•
s
corresponds to width of the Gaussian
•
more later...