Page "Discrete cosine transform" Paragraph 17
from
Wikipedia
Formally, the discrete cosine transform is a linear, invertible function ( where denotes the set of real numbers ), or equivalently an invertible N × N square matrix.
There are several variants of the DCT with slightly modified definitions.
The N real numbers x < sub > 0 </ sub >, ..., x < sub > N-1 </ sub > are transformed into the N real numbers X < sub > 0 </ sub >, ..., X < sub > N-1 </ sub > according to one of the formulas:
Page 1 of 1.
1.964 seconds.