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aa399.txt

Associated article: Algorithm Alley

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Published source code accompanying the article by Tim Kientzle in which he discusses the Discrete Cosine Transform (DCT) which is a crucial part of modern image and sound compression. Tim discusses several fast algorithms for computing the 8-point DCT and IDCT. Also see AA399.ZIP.

					by Algorithm Alley
Tim Kientzle


Figure 1: 
(a)
C(i) = a(i)/2 SUM from x=0 to (N-1) s(x) cos(PI i (2x+1)/ 2N)

(b)
C(j,i) = a(j)/2 a(i)/2 SUM from y=0 to (N-1) SUM from x=0 to (...
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