Discrete cosine transform

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A discrete cosine transform (DCT) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies. The DCT, first proposed by Nasir Ahmed in 1972, is a widely used transformation technique in signal processing and data compression. It is used in most digital media, including digital images (such as JPEG and HEIF, where small high-frequency components can be discarded), digital video (such as MPEG and H.26x), digital audio (such as Dolby Digital, MP3 and AAC), digital television (such as SDTV, HDTV and VOD), digital radio (such as AAC+ and DAB+), and speech coding (such as AAC-LD, Siren and Opus). DCTs are also important to numerous other applications in science and engineering, such as digital signal processing, telecommunication devices, reducing network bandwidth usage, and spectral methods for the numerical solution of partial differential equations.

Discrete cosine transform - Wikipedia Jump to content From Wikipedia, the free encyclopedia Technique used in signal processing and data compression A discrete cosine transform ( DCT ) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies . The DCT, first proposed by Nasir Ahmed in 1972, is a widely used transformation technique in signal processing and data compression . It is used in most digital media , including digital images (such as JPEG and HEIF ), digital video (such as MPEG and H.26x ), digital audio (such as Dolby Digit

Discrete cosine transform

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