DCT¶

Inputs¶

• array (vector_real) - the input array

Outputs¶

• dct (vector_real) - the discrete cosine transform of the input array

Parameters¶

• dctType (integer ∈ [2, 3], default = 2) :

  the DCT type

• inputSize (integer ∈ [1, ∞), default = 10) :

  the size of the input array

• liftering (integer ∈ [0, ∞), default = 0) :

  the liftering coefficient. Use ‘0’ to bypass it

• outputSize (integer ∈ [1, ∞), default = 10) :

  the number of output coefficients

Description¶

This algorithm computes the Discrete Cosine Transform of an array. It uses the DCT-II form, with the 1/sqrt(2) scaling factor for the first coefficient.

Note: The ‘inputSize’ parameter is only used as an optimization when the algorithm is configured. The DCT will automatically adjust to the size of any input.

References:

[1] Discrete cosine transform - Wikipedia, the free encyclopedia, http://en.wikipedia.org/wiki/Discrete_cosine_transform

Source code¶

• C++ source code

• C++ header file

See also¶

DCT (standard)