TensorFlow 2 version | View source on GitHub |
Computes the 1D Inverse Discrete Cosine Transform (DCT) of input
.
tf.signal.idct(
input, type=2, n=None, axis=-1, norm=None, name=None
)
Currently only Types I, II and III are supported. Type III is the inverse of Type II, and vice versa.
Note that you must re-normalize by 1/(2n) to obtain an inverse if norm
is
not 'ortho'
. That is:
signal == idct(dct(signal)) * 0.5 / signal.shape[-1]
.
When norm='ortho'
, we have:
signal == idct(dct(signal, norm='ortho'), norm='ortho')
.
Args | |
---|---|
input
|
A [..., samples] float32 Tensor containing the signals to take
the DCT of.
|
type
|
The IDCT type to perform. Must be 1, 2 or 3. |
n
|
For future expansion. The length of the transform. Must be None .
|
axis
|
For future expansion. The axis to compute the DCT along. Must be -1 .
|
norm
|
The normalization to apply. None for no normalization or 'ortho'
for orthonormal normalization.
|
name
|
An optional name for the operation. |
Returns | |
---|---|
A [..., samples] float32 Tensor containing the IDCT of input .
|
Raises | |
---|---|
ValueError
|
If type is not 1 , 2 or 3 , n is not None, axisis
not -1, or normis not Noneor 'ortho'`.
|
Scipy Compatibility
Equivalent to scipy.fftpack.idct for Type-I, Type-II and Type-III DCT.