def test_wavedecn_shapes_and_size():
wav = pywt.Wavelet('db2')
for data_shape in [(33, ), (64, 32), (1, 15, 30)]:
for axes in [None, 0, -1]:
for mode in pywt.Modes.modes:
coeffs = pywt.wavedecn(np.ones(data_shape),
wav,
mode=mode,
axes=axes)
# verify that the shapes match the coefficient shapes
shapes = pywt.wavedecn_shapes(data_shape,
wav,
mode=mode,
axes=axes)
assert_equal(coeffs[0].shape, shapes[0])
expected_size = coeffs[0].size
for level in range(1, len(coeffs)):
for k, v in coeffs[level].items():
expected_size += v.size
assert_equal(shapes[level][k], v.shape)
# size can be determined from either the shapes or coeffs
size = pywt.wavedecn_size(shapes)
assert_equal(size, expected_size)
size = pywt.wavedecn_size(coeffs)
assert_equal(size, expected_size)
def scales(self):
"""Get the scales of each coefficient.
Returns
-------
scales : ``range`` element
The scale of each coefficient, given by an integer. 0 for the
lowest resolution and self.nlevels for the highest.
"""
if self.impl == 'pywt':
if self.__variant == 'forward':
discr_space = self.domain
wavelet_space = self.range
else:
discr_space = self.range
wavelet_space = self.domain
shapes = pywt.wavedecn_shapes(discr_space.shape,
self.pywt_wavelet,
mode=self.pywt_pad_mode,
level=self.nlevels,
axes=self.axes)
coeff_list = [np.full(shapes[0], 0)]
for i in range(1, 1 + len(shapes[1:])):
coeff_list.append(
{k: np.full(shapes[i][k], i)
for k in shapes[i].keys()})
coeffs = pywt.ravel_coeffs(coeff_list, axes=self.axes)[0]
return wavelet_space.element(coeffs)
else:
raise RuntimeError("bad `impl` '{}'".format(self.impl))
def send_bitplane(self, indata, bitplane_number):
bitplane = (indata[:, bitplane_number%self.number_of_channels] >> bitplane_number//self.number_of_channels) & 1
if np.any(bitplane):
bitplane = bitplane.astype(np.uint8)
bitplane = np.packbits(bitplane)
message = struct.pack(self.packet_format, self.recorded_chunk_number, bitplane_number, self.received_bitplanes_per_chunk[(self.played_chunk_number+1) % self.cells_in_buffer]+1, *bitplane)
self.sending_sock.sendto(message, (self.destination_IP_addr, self.destination_port))
else:
self.skipped_bitplanes[self.recorded_chunk_number % self.cells_in_buffer] += 1
# Get the number of wavelet coefficients to get the number of samples
shapes = wt.wavedecn_shapes((bitplane,), wavelet)
#Devuelve valores espaciados uniformemente dentro de un intervalo dado.
#Los valores se generan dentro del intervalo medio abierto (en otras palabras, el intervalo que incluye inicio pero excluye detención ).
#Para argumentos enteros, la función es equivalente a la función de rango incorporada de Python , pero devuelve un ndarray en lugar de una lista.
#[start, stop)
#(inicio,parada, paso)
sample = np.arange(0, bitplane, 1)
#Agregar una subtrama a la figura actual.
#Contenedor Figure.add_subplotcon una diferencia de comportamiento explicado en la sección de notas.
fig, axs = plt.subplots(bitplane//skipped_bitplanes,1, sharex=True)
for i in range(0, bitplane,skipped_bitplanes):
axs[i//skipped_bitplanes].set_ylim(-bitplane, bitplane)
axs[i//skipped_bitplanes].grid(True)
#Dibujamos en el eje de las cordenadas las muestras y la amplitud.
axs[bitplane//skipped_bitplanes-1].set_xlabel('sample')
axs[bitplane//skipped_bitplanes-2].set_ylable('Amplitud')
print("Coefficient\t Energy")
def test_wavedecn_shapes_and_size():
wav = pywt.Wavelet('db2')
for data_shape in [(33, ), (64, 32), (1, 15, 30)]:
for axes in [None, 0, -1]:
for mode in pywt.Modes.modes:
coeffs = pywt.wavedecn(np.ones(data_shape), wav,
mode=mode, axes=axes)
# verify that the shapes match the coefficient shapes
shapes = pywt.wavedecn_shapes(data_shape, wav,
mode=mode, axes=axes)
assert_equal(coeffs[0].shape, shapes[0])
expected_size = coeffs[0].size
for level in range(1, len(coeffs)):
for k, v in coeffs[level].items():
expected_size += v.size
assert_equal(shapes[level][k], v.shape)
# size can be determined from either the shapes or coeffs
size = pywt.wavedecn_size(shapes)
assert_equal(size, expected_size)
size = pywt.wavedecn_size(coeffs)
assert_equal(size, expected_size)
def __init__(self,
x_shape,
wavelet,
level,
axes=None,
pad_on_demand="constant"):
"""Decimated wavelet Transform operator.
:param x_shape: Shape of the data to be wavelet transformed.
:type x_shape: `numpy.array_like`
:param wavelet: Wavelet type
:type wavelet: string
:param level: Numer of wavelet decomposition levels
:type level: int
:param axes: Axes along which to do the transform, defaults to None
:type axes: int or tuple of int, optional
:param pad_on_demand: Padding type to fit the `2 ** level` shape requirements, defaults to 'constant'
:type pad_on_demand: string, optional. Options are all the `numpy.pad` padding modes.
:raises ValueError: In case the pywavelets package is not available or its version is not adequate.
"""
if not has_pywt:
raise ValueError(
"Cannot use Wavelet transform because pywavelets is not installed."
)
self.wavelet = wavelet
self.level = level
if axes is None:
axes = np.arange(-len(x_shape), 0, dtype=np.intp)
self.axes = axes
self.pad_on_demand = pad_on_demand
num_axes = len(self.axes)
self.dir_shape = np.array(x_shape)
self.sub_band_shapes = pywt.wavedecn_shapes(self.dir_shape,
self.wavelet,
mode=self.pad_on_demand,
level=self.level,
axes=self.axes)
self.adj_shape = self.dir_shape.copy()
for ax in self.axes:
self.adj_shape[ax] = self.sub_band_shapes[0][ax] + np.sum([
self.sub_band_shapes[x]["d" * num_axes][ax]
for x in range(1, self.level + 1)
])
self.slicing_info = None
super().__init__()
def __init__(self,
space,
wavelet,
nlevels,
variant,
pad_mode='constant',
pad_const=0,
impl='pywt',
axes=None):
"""Initialize a new instance.
Parameters
----------
space : `DiscreteLp`
Domain of the forward wavelet transform (the "image domain").
In the case of ``variant in ('inverse', 'adjoint')``, this
space is the range of the operator.
wavelet : string or `pywt.Wavelet`
Specification of the wavelet to be used in the transform.
If a string is given, it is converted to a `pywt.Wavelet`.
Use `pywt.wavelist` to get a list of available wavelets.
Possible wavelet families are:
``'haar'``: Haar
``'db'``: Daubechies
``'sym'``: Symlets
``'coif'``: Coiflets
``'bior'``: Biorthogonal
``'rbio'``: Reverse biorthogonal
``'dmey'``: Discrete FIR approximation of the Meyer wavelet
variant : {'forward', 'inverse', 'adjoint'}
Wavelet transform variant to be created.
nlevels : positive int, optional
Number of scaling levels to be used in the decomposition. The
maximum number of levels can be calculated with
`pywt.dwtn_max_level`.
Default: Use maximum number of levels.
pad_mode : string, optional
Method to be used to extend the signal.
``'constant'``: Fill with ``pad_const``.
``'symmetric'``: Reflect at the boundaries, not repeating the
outmost values.
``'periodic'``: Fill in values from the other side, keeping
the order.
``'order0'``: Extend constantly with the outmost values
(ensures continuity).
``'order1'``: Extend with constant slope (ensures continuity of
the first derivative). This requires at least 2 values along
each axis where padding is applied.
``'pywt_per'``: like ``'periodic'``-padding but gives the smallest
possible number of decomposition coefficients.
Only available with ``impl='pywt'``, See ``pywt.Modes.modes``.
``'reflect'``: Reflect at the boundary, without repeating the
outmost values.
``'antisymmetric'``: Anti-symmetric variant of ``symmetric``.
``'antireflect'``: Anti-symmetric variant of ``reflect``.
For reference, the following table compares the naming conventions
for the modes in ODL vs. PyWavelets::
======================= ==================
ODL PyWavelets
======================= ==================
symmetric symmetric
reflect reflect
order1 smooth
order0 constant
constant, pad_const=0 zero
periodic periodic
pywt_per periodization
antisymmetric antisymmetric
antireflect antireflect
======================= ==================
See `signal extension modes`_ for an illustration of the modes
(under the PyWavelets naming conventions).
pad_const : float, optional
Constant value to use if ``pad_mode == 'constant'``. Ignored
otherwise. Constants other than 0 are not supported by the
``pywt`` back-end.
impl : {'pywt'}, optional
Back-end for the wavelet transform.
axes : sequence of ints, optional
Axes over which the DWT that created ``coeffs`` was performed. The
default value of ``None`` corresponds to all axes. When not all
axes are included this is analagous to a batch transform in
``len(axes)`` dimensions looped over the non-transformed axes. In
orther words, filtering and decimation does not occur along any
axes not in ``axes``.
References
----------
.. _signal extension modes:
https://pywavelets.readthedocs.io/en/latest/ref/signal-extension-modes.html
"""
if not isinstance(space, DiscreteLp):
raise TypeError('`space` {!r} is not a `DiscreteLp` instance.'
''.format(space))
self.__impl, impl_in = str(impl).lower(), impl
if self.impl not in _SUPPORTED_WAVELET_IMPLS:
raise ValueError("`impl` '{}' not supported".format(impl_in))
if axes is None:
axes = tuple(range(space.ndim))
elif np.isscalar(axes):
axes = (axes, )
elif len(axes) > space.ndim:
raise ValueError("Too many axes.")
self.axes = tuple(axes)
if nlevels is None:
nlevels = pywt.dwtn_max_level(space.shape, wavelet, self.axes)
self.__nlevels, nlevels_in = int(nlevels), nlevels
if self.nlevels != nlevels_in:
raise ValueError('`nlevels` must be integer, got {}'
''.format(nlevels_in))
self.__impl, impl_in = str(impl).lower(), impl
if self.impl not in _SUPPORTED_WAVELET_IMPLS:
raise ValueError("`impl` '{}' not supported".format(impl_in))
self.__wavelet = getattr(wavelet, 'name', str(wavelet).lower())
self.__pad_mode = str(pad_mode).lower()
self.__pad_const = space.field.element(pad_const)
if self.impl == 'pywt':
self.pywt_pad_mode = pywt_pad_mode(pad_mode, pad_const)
self.pywt_wavelet = pywt_wavelet(self.wavelet)
# determine coefficient shapes (without running wavedecn)
self._coeff_shapes = pywt.wavedecn_shapes(space.shape,
wavelet,
mode=self.pywt_pad_mode,
level=self.nlevels,
axes=self.axes)
# precompute slices into the (raveled) coeffs
self._coeff_slices = precompute_raveled_slices(self._coeff_shapes)
coeff_size = pywt.wavedecn_size(self._coeff_shapes)
coeff_space = space.tspace_type(coeff_size, dtype=space.dtype)
else:
raise RuntimeError("bad `impl` '{}'".format(self.impl))
variant, variant_in = str(variant).lower(), variant
if variant not in ('forward', 'inverse', 'adjoint'):
raise ValueError("`variant` '{}' not understood"
"".format(variant_in))
self.__variant = variant
if variant == 'forward':
super(WaveletTransformBase, self).__init__(domain=space,
range=coeff_space,
linear=True)
else:
super(WaveletTransformBase, self).__init__(domain=coeff_space,
range=space,
linear=True)
# least distance of an valid R peak to two ends of ECG signals
PreprocCfg.rpeaks_skip_dist = int(0.5 * PreprocCfg.fs) # 0.5s
# FeatureCfg only for ML models, deprecated
FeatureCfg = ED()
FeatureCfg.fs = BaseCfg.fs
FeatureCfg.features = ['wavelet', 'rr', 'morph',]
FeatureCfg.wt_family = 'db1'
FeatureCfg.wt_level = 3
FeatureCfg.beat_winL = BaseCfg.beat_winL
FeatureCfg.beat_winR = BaseCfg.beat_winR
FeatureCfg.wt_feature_len = pywt.wavedecn_shapes(
shape=(1+FeatureCfg.beat_winL+FeatureCfg.beat_winR,),
wavelet=FeatureCfg.wt_family,
level=FeatureCfg.wt_level
)[0][0]
FeatureCfg.rr_local_range = 10 # 10 r peaks
FeatureCfg.rr_global_range = 5 * 60 * FeatureCfg.fs # 5min, units in number of points
FeatureCfg.rr_normalize_radius = 30 # number of beats (rpeaks)
FeatureCfg.morph_intervals = [[0,45], [85,95], [110,120], [170,200]]
ModelCfg = ED()
ModelCfg.fs = BaseCfg.fs
ModelCfg.n_leads = 1
ModelCfg.torch_dtype = BaseCfg.torch_dtype
+-------------------------------+-------------------------------+ """ cam = pywt.data.camera() coeffs = pywt.wavedecn(cam, wavelet="db2", level=3) # Concatenating all coefficients into a single n-d array arr, coeff_slices = pywt.coeffs_to_array(coeffs) # Splitting concatenated coefficient array back into its components coeffs_from_arr = pywt.array_to_coeffs(arr, coeff_slices) cam_recon = pywt.waverecn(coeffs_from_arr, wavelet='db2') # Raveling coefficients to a 1D array arr, coeff_slices, coeff_shapes = pywt.ravel_coeffs(coeffs) # Unraveling coefficients from a 1D array coeffs_from_arr = pywt.unravel_coeffs(arr, coeff_slices, coeff_shapes) cam_recon2 = pywt.waverecn(coeffs_from_arr, wavelet='db2') # Multilevel: n-d coefficient shapes shapes = pywt.wavedecn_shapes((64, 32), 'db2', mode='periodization') # Multilevel: Total size of all coefficients size = pywt.wavedecn_size(shapes) print(size) print()