Figure 7 The result of applying the first 3x3 low-pass filter mask in Figure 3 with the image segment in Figure 5

100  100  100  100  100
 50   50   50   50   50
100  100  100  100  100
 50   50   50   50   50
100  100  100  100  100
 50   50   50   50   50
100  100  100  100  100
 50   50   50   50   50
100  100  100  100  100
 50   50   50   50   50