noun
Discrete Cosine Transform; DCT
A mathematical transform used in signal processing and image compression (e.g., JPEG). Technical computing term.
JPEG圧縮では離散コサイン変換が使われている。
The Discrete Cosine Transform is used in JPEG compression.
Discrete Fourier Transform; related but uses complex exponentials, while DCT uses only cosine functions and is often preferred for real-valued data compression.
Calque from English 'Discrete Cosine Transform'; 離散 (discrete) + コサイン (cosine) + 変換 (transform).