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Graphics Interchange Format  |  1999-07-12  |  36.7 KB  |  455x276  |  4-bit (16 colors)
   ocr: (a) N1 S(x) 2 al COcos 2N 1(2x41)) (b) Net N1 s(yx)-2 Z al) 2 al) 2 CO) coS a à 2N 1(2X41 Cost : 2N 1(2441) - j=0 1-0 (c) s(x)-2 au 2 COSI 2N 11(2y+1) d E N1 2. a() CU)cos L 2N: 1(2X41) Eo: Figure 2: Irverse DCTequations. Cis the DCTcoelficients, S iS ibe ousput samples. a(x) is 1/san2)1/x1s0, 1 Otberwise, (a/one-dimersionals (b)iwo- dimensional Qnuo-dimensiona, rewritten to show separation.