results than conventional LBP based schemes.

Several observations can be made for CLBP. First, LBP is a

special case of CLBP by using only CLBP_S. Second, we will

show that the sign component preserves more image local

structural information than the magnitude component. This

explains why the simple LBP (i.e. CLBP_S) operator works

much better than CLBP_M for texture classification. Third, the

proposed CLBP_S, CLBP_M and CLBP_C code maps have