SHADOW filter
The SHADOW filter is a standard linear filter which works in a 3x3 environment. The values in the matrix are:
|
-3 |
-2 |
-1 |
|
|
-2 |
1 |
2 |
|
|
-1 |
2 |
4 |
Gain factor 1.
The illumination direction can be varied by mirroring the values of the matrix.
See also: