404 
1 
1 
1 
2 
2 
2 
1 
1 
1 
2 
2 
2 
1 
1 
1 
2 
2 
2 
2 
2 
2 
1 
1 
1 
2 
2 
2 
1 
1 
1 
2 
2 
2 
1 
1 
1 
Diagonal winner is the larger of: 
(Class Frequency * Weight) 
Class 1: 5 pixels * 1.00 = 5.00 
Class 2: 4 pixels * 1.27 = 5.08 
1 
1 
1 
2 
2 
2 
1 
1 
1 
2 
2 
2 
1 
1 
2 
2 
2 
2 
2 
2 
2 
2 
1 
1 
2 
2 
2 
1 
1 
1 
2 
2 
2 
1 
1 
1 
BEFORE 
AFTER 
Figure 1 - Diagonal connections are undesirable for vector systems because polygons 
crossover and occupy a common location. The 'IBIS' spatial f1 ter,ng technique en 
laces each pixel by a factor of three to operate at a subpixel leve . When h,er- 
archical weights are employed in a moving 3x3 box window the diagonal connections 
are broken.