Chamfer Mask:
( 1,  0,   3)
( 1,  1,   4)

Computed Lut Mask:
( 1,  0,   3)
( 1,  1,   4)

Look-Up Table: values which differ from LMC (L = 500, R <= 1496)
Lut[][    3 ] =     4     5 
Lut[][    6 ] =     8     9