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IDCT (Inverse Discrete Cosine Transform)
The basic research work and events that led to the development of the DCT were summarized in a later publication by N. Ahmed, "How I came up with the Discrete Cosine Transform".
JPEG-based compression (TIFF compression scheme 7) uses the DCT (Discrete Cosine Transform) introduced in 1974 by N. Ahmed, T.Natarajan and K.R. Rao; see Reference 1 in Discrete cosine transform.