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   ocr: a) al N1 SXCOS 11(21) 2N (b) CO0= aj) 2 2 a) L y=0 NN X-0 L slyX) COS S 2N 1(2x+1) coS! I 2N 12y+1) (c) Cui 2 al) N1 L COSI de 1112441) 2N at) 2: X=0 N1 D s(yx)cos 2N 11(2x41) l Figure 1: Forward DCTequations: S 1S the impret semples, Cis ibe: resulting coefficients. a(x) iS 1sgn(2)ixis0, 1 otberwise. fypically, N=8 (a) one- dimensional, (b) two-dimensional, (C)wo- dimensional, rewrilter t0 sbow separation