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Algorithm Alley

By Tim Kientzle, March 01, 1999

The Discrete Cosine Transform (DCT) is a crucial part of modern image and sound compression. Tim discusses several fast algorithms for computing the 8-point DCT and IDCT.
Mar99: Algorithm Alley

Implementing Fast DCTs

By Tim Kientzle

Dr. Dobb's Journal March 1999

Figure 2: Inverse DCT equations. C is the DCT coefficients, s is the output samples. a(x) is 1/sqrt(2) if x is 0, 1 otherwise; (a) one-dimensional; (b) two-dimensional; (c) two-dimensional, rewritten to show separation.

Copyright © 1999, Dr. Dobb's Journal


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