Noun
IDCT (plural IDCTs)
(mathematics) Initialism of inverse discrete cosine transform.
The most common variant of discrete cosine transform is the type-II DCT, which is often called simply "the DCT". citation citation Its inverse, the type-III DCT, is correspondingly often called simply "the inverse DCT" or "the IDCT". Source: Internet
The minimum allowed accuracy of a decoder IDCT approximation is defined by ISO/IEC 23002-1. Source: Internet