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- filter : 3x3 rotation symmetrical filter.
- central:cc, diagonal:cd, hori/verti:chv.
- out = filter(in) * (mul/1024) + add
- cmd : filter in, out, cd, chv, cc, mul, add
- dflt: filter A, B , 0 , -1 , 5 ,1024, 0
- range: <A,B><A,B>,<-/+1000>,<10000><-+255>
-