discrete cosine transform

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.