Kernel "FreiChen" of size 3x3+1+1 with values from -1.41421 to 1.41421
Forming a output range from -3.41421 to 3.41421 (Zero-Summing)
 0:         1         0        -1
 1:   1.41421         0  -1.41421
 2:         1         0        -1