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June 2004 Isis® Sonar User's Manual, Volume1 183
Table 9-2. Median order for 3 filters in 2 pi
x
el array
sizes
Filter 3 by 3 Kernel 5 by 5 Kernel
Suppress Noise
2 5
Smooth Image
5 11
Fill Echoes
8 17
Table 9-3 is a summary of the kernels that are used for each of the
convolution filters.
Table 9-3. Convolution kernels
Filter Position 3 by 3 Kernels 5 by 5 Kernels
Focus
1 1 1
1 -7 1
1 1 1
0 1 1 1 0
1 1 -3 1 1
1 -3 -3 -3 1
1 1 -3 1 1
0 1 1 1 0
Horizontal Top
-1 -2 -1
0 1 0
1 2 1
-1 -1 -1 -1 -1
-1 -2 -2 -2 -1
0 0 1 0 0
1 2 2 2 1
1 1 1 1 1
Horizontal Bottom
1 2 1
0 1 0
-1 -2 -1
1 1 1 1 1
1 2 2 2 1
0 0 1 0 0
-1 -2 -2 -2 -1
-1 -1 -1 -1 -1
Vertical Left
-1 0 1
-2 1 2
-1 -1 0 1 1
-1 -2 0 2 1
Chapter 9: Using the Tools Menu
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