results than conventional LBP based schemes.Several observations can be made for CLBP. First, LBP is aspecial case of CLBP by using only CLBP_S. Second, we willshow that the sign component preserves more image localstructural information than the magnitude component. Thisexplains why the simple LBP (i.e. CLBP_S) operator worksmuch better than CLBP_M for texture classification. Third, theproposed CLBP_S, CLBP_M and CLBP_C code maps have