def uncompress_image(compressed_image, level, im_shape):
# Breaking Compressed Wavlet of Image into RGB Layers (Wavlet Compression works on 2D arrays only)
arr_r_compressed = compressed_image[:, :, 0]
arr_g_compressed = compressed_image[:, :, 1]
arr_b_compressed = compressed_image[:, :, 2]
x_shape, y_shape = im_shape
slices = generate_wavlet_slices(x_shape, y_shape, level=level)
# Converting Compressed Coefficients back into Original Wavlet form (which the pywt library can work with)
r_coeff = pywt.array_to_coeffs(arr_r_compressed,
slices,
output_format='wavedecn')
g_coeff = pywt.array_to_coeffs(arr_g_compressed,
slices,
output_format='wavedecn')
b_coeff = pywt.array_to_coeffs(arr_b_compressed,
slices,
output_format='wavedecn')
# Using PYWT to uncompress the wavlet coefficients back into their image form
r_reconstructed = pywt.waverecn(r_coeff, 'db2',
mode='periodization').astype(np.uint8)
g_reconstructed = pywt.waverecn(g_coeff, 'db2',
mode='periodization').astype(np.uint8)
b_reconstructed = pywt.waverecn(b_coeff, 'db2',
mode='periodization').astype(np.uint8)
# Stacking the uncompressed R. G. B. images into the final RGB image
reconstructed_im = (np.stack(
(r_reconstructed, g_reconstructed, b_reconstructed),
2)).astype(np.uint8)
return reconstructed_im
def unpack(self,chunk):
upacked_chunk = np.empty((minimal.args.frames_per_chunk,2),dtype=np.int32)
reconstructed_chunk =np.empty((minimal.args.frames_per_chunk+(self.padding*2),2),dtype=np.int32)
chunk_number,chunk = super().unpack(chunk)
decomposition_0 =wt.array_to_coeffs(chunk[:,0],self.slices,output_format='wavedec')
decomposition_1 =wt.array_to_coeffs(chunk[:,1],self.slices,output_format='wavedec')
reconstructed_chunk[:, 0] = np.rint(wt.waverec(decomposition_0, self.wavelet)).astype(np.int16)
reconstructed_chunk[:, 1] = np.rint(wt.waverec(decomposition_1, self.wavelet)).astype(np.int16)
upacked_chunk = reconstructed_chunk[self.padding:(minimal.args.frames_per_chunk+self.padding)]
return chunk_number,upacked_chunk
def test_wavedecn_coeff_reshape_even():
# verify round trip is correct:
# wavedecn - >coeffs_to_array-> array_to_coeffs -> waverecn
# This is done for wavedec{1, 2, n}
rng = np.random.RandomState(1234)
params = {'wavedec': {'d': 1, 'dec': pywt.wavedec, 'rec': pywt.waverec},
'wavedec2': {'d': 2, 'dec': pywt.wavedec2, 'rec': pywt.waverec2},
'wavedecn': {'d': 3, 'dec': pywt.wavedecn, 'rec': pywt.waverecn}}
N = 28
for f in params:
x1 = rng.randn(*([N] * params[f]['d']))
for mode in pywt.Modes.modes:
for wave in wavelist:
w = pywt.Wavelet(wave)
maxlevel = pywt.dwt_max_level(np.min(x1.shape), w.dec_len)
if maxlevel == 0:
continue
coeffs = params[f]['dec'](x1, w, mode=mode)
coeff_arr, coeff_slices = pywt.coeffs_to_array(coeffs)
coeffs2 = pywt.array_to_coeffs(coeff_arr, coeff_slices,
output_format=f)
x1r = params[f]['rec'](coeffs2, w, mode=mode)
assert_allclose(x1, x1r, rtol=1e-4, atol=1e-4)
def hfilter(diff_image, var_image, threshold=1, ndamp=10):
"""
This code was inspired from: https://github.com/spacetelescope/sprint_notebooks/blob/master/lucy_damped_haar.ipynb
I believe it was initially written by Justin Ely: https://github.com/justincely
It was buggy and not working properly with every image sizes.
I have thus exchanged it by using pyWavelet (pywt) and a custom function htrans
to calculate the matrix for the var_image.
"""
him, coeff_slices = pywt.coeffs_to_array(pywt.wavedec2(
diff_image.astype(np.float), 'haar'),
padding=0)
dvarim = htrans(var_image.astype(np.float))
sqhim = ((him / threshold)**2) / dvarim
index = np.where(sqhim < 1)
if len(index[0]) == 0:
return diff_image
# Eq. 8 of White is derived leading to N*x^(N-1)-(N-1)*x^N :DOI: 10.1117/12.176819
sqhim = sqhim[index] * (ndamp * sqhim[index]**(ndamp - 1) -
(ndamp - 1) * sqhim[index]**ndamp)
him[index] = sign(threshold * np.sqrt(dvarim[index] * sqhim), him[index])
return pywt.waverec2(
pywt.array_to_coeffs(him, coeff_slices, output_format='wavedec2'),
'haar')[:diff_image.shape[0], :diff_image.shape[1]]
def test_wavedecn_coeff_reshape_even():
# verify round trip is correct:
# wavedecn - >coeffs_to_array-> array_to_coeffs -> waverecn
# This is done for wavedec{1, 2, n}
rng = np.random.RandomState(1234)
params = {'wavedec': {'d': 1, 'dec': pywt.wavedec, 'rec': pywt.waverec},
'wavedec2': {'d': 2, 'dec': pywt.wavedec2, 'rec': pywt.waverec2},
'wavedecn': {'d': 3, 'dec': pywt.wavedecn, 'rec': pywt.waverecn}}
N = 28
for f in params:
x1 = rng.randn(*([N] * params[f]['d']))
for mode in pywt.Modes.modes:
for wave in wavelist:
w = pywt.Wavelet(wave)
maxlevel = pywt.dwt_max_level(np.min(x1.shape), w.dec_len)
if maxlevel == 0:
continue
coeffs = params[f]['dec'](x1, w, mode=mode)
coeff_arr, coeff_slices = pywt.coeffs_to_array(coeffs)
coeffs2 = pywt.array_to_coeffs(coeff_arr, coeff_slices,
output_format=f)
x1r = params[f]['rec'](coeffs2, w, mode=mode)
assert_allclose(x1, x1r, rtol=1e-4, atol=1e-4)
def test_wavedecn_coeff_reshape_axes_subset():
# verify round trip is correct when only a subset of axes are transformed:
# wavedecn - >coeffs_to_array-> array_to_coeffs -> waverecn
# This is done for wavedec{1, 2, n}
rng = np.random.RandomState(1234)
mode = 'symmetric'
w = pywt.Wavelet('db2')
N = 16
ndim = 3
for axes in [(-1, ), (0, ), (1, ), (0, 1), (1, 2), (0, 2), None]:
x1 = rng.randn(*([N] * ndim))
coeffs = pywt.wavedecn(x1, w, mode=mode, axes=axes)
coeff_arr, coeff_slices = pywt.coeffs_to_array(coeffs, axes=axes)
if axes is not None:
# if axes is not None, it must be provided to coeffs_to_array
assert_raises(ValueError, pywt.coeffs_to_array, coeffs)
# mismatched axes size
assert_raises(ValueError, pywt.coeffs_to_array, coeffs,
axes=(0, 1, 2, 3))
assert_raises(ValueError, pywt.coeffs_to_array, coeffs,
axes=())
coeffs2 = pywt.array_to_coeffs(coeff_arr, coeff_slices)
x1r = pywt.waverecn(coeffs2, w, mode=mode, axes=axes)
assert_allclose(x1, x1r, rtol=1e-4, atol=1e-4)
def inverse(self, m, wv = 'db4'):
msyn = np.zeros(mesh.nC)
coeff_wv = pywt.wavedecn(msyn.reshape(self.mesh.nCx,self.mesh.nCy,order = 'F'),wv, mode = 'per')
array_wv = pywt.coeffs_to_array(coeff_wv)
coeff_back = pywt.array_to_coeffs(m.reshape(array_wv[0].shape, order = 'F'),array_wv[1])
coeff_m = pywt.waverecn(coeff_back,wv, mode = 'per')
return Utils.mkvc(coeff_m)
def wavelet_denoise(
im,
mother_wavelet: str = "db1", # Daubechies wavelet 1
levels: int = 4,
keep: float = 1 / 1e2, # percent
):
"""
:param im:
:type im:"""
coef = pywt.wavedec2(im, wavelet=mother_wavelet, level=levels)
coef_array, coef_slices = pywt.coeffs_to_array(coef)
Csort = numpy.sort(numpy.abs(coef_array.reshape(-1)))
coef_filt = pywt.array_to_coeffs(
coef_array * (numpy.abs(coef_array) > Csort[int(
numpy.floor((1 - keep) * len(Csort)))]),
coef_slices,
output_format=CoeffFormatEnum.wavedec2.value,
)
recon = pywt.waverec2(coef_filt, wavelet=mother_wavelet)
return recon
def recompose(self, data, coeff_slices, chnl):
data[:, chnl] = np.around(
pywt.waverec(
pywt.array_to_coeffs(data[:, chnl],
coeff_slices,
output_format="wavedec"), "bior3.5",
"periodization"))
def ista_algorithm_2d(wavelet, noisy_image, l):
# Create a matrix of 0s and getting it's wavelet coefficients
x = fwd_transform(np.zeros(noisy_image.shape), wavelet)
# Converting coefficients to array for calculation
x_arr, x_slices = pywt.coeffs_to_array(x)
# Creating a list of errors
error_log = []
# Setting inital error to maximum
error_old = np.finfo(np.float64).max
# Run loop until error condition is satisfied
while True:
# Soft thresholding
x_arr = pywt.threshold(x_arr + pywt.coeffs_to_array(
fwd_transform(noisy_image - inv_transform(x, wavelet),
wavelet))[0],
l / 2,
mode='soft')
# Converting array back to coefficients
x = pywt.array_to_coeffs(x_arr, x_slices, 'wavedec2')
# Calculating error
error = np.power(
np.linalg.norm(noisy_image - inv_transform(x, wavelet), 2),
2) + np.linalg.norm(x_arr, 1) * l
error_log.append(error)
# Error condition for the loop to break
if (error_old - error) / error_old < 1e-7:
break
error_old = error
return inv_transform(x, wavelet), error_log
def record_send_and_play(self, indata, outdata, frames, time, status):
#print(indata)
#indata[:,0] = self.DWT(indata[:,0])
coeffs_in_subbands = wt.wavedec(indata[:,0], wavelet=self.wavelet, level=self.levels, mode=self.padding)
for i in range(len(coeffs_in_subbands)):
#print(coeffs_in_subbands[i][0], self.gain[i])
coeffs_in_subbands[i] *= self.gain[i]
coeffs = wt.coeffs_to_array(coeffs_in_subbands)[0].astype(self.precision_type)
signs = coeffs & self.sign_mask
magnitudes = abs(coeffs)
coeffs = signs | magnitudes
self.send(coeffs.reshape((self.frames_per_chunk,1)))
coeffs = self._buffer[self.played_chunk_number % self.cells_in_buffer][:,0]
signs = coeffs >> self.precision_bits_1
magnitudes = coeffs & self.magnitude_mask
coeffs = magnitudes + magnitudes*signs*2
coeffs_in_subbands = wt.array_to_coeffs(coeffs.astype(np.float32), self.slices, output_format="wavedec")
for i in range(len(coeffs_in_subbands)):
#print(type(coeffs_in_subbands[i][0]), self.gain[i])
coeffs_in_subbands[i] /= self.gain[i]
chunk = np.around(wt.waverec(coeffs_in_subbands, wavelet=self.wavelet, mode=self.padding)).astype(self.precision_type)
#chunk[:,0] = self.iDWT(chunk[:,0])
self._buffer[self.played_chunk_number % self.cells_in_buffer][:,0] = chunk
#print(chunk)
self.play(outdata)
if __debug__:
self._number_of_received_bitplanes.value += self.received_bitplanes_per_chunk[self.played_chunk_number % self.cells_in_buffer]
self.received_bitplanes_per_chunk[self.played_chunk_number % self.cells_in_buffer] = 0
def init(self, args):
Intercom_DWT.init(self, args)
zeros = np.zeros(self.frames_per_chunk)
coeffs = wt.wavedec(zeros, wavelet=self.wavelet, level=self.levels, mode=self.padding)
arr, slices = wt.coeffs_to_array(coeffs)
energy = []
subband = 0
for i in range(self.levels,-1,-1):
base = self.frames_per_chunk >> (i+1)
base_div_2 = self.frames_per_chunk >> (i+2)
coeff_index = base+base_div_2
arr[coeff_index] = self.frames_per_chunk
coeffs = wt.array_to_coeffs(arr, slices, output_format="wavedec")
samples = wt.waverec(coeffs, wavelet=self.wavelet, mode=self.padding)
arr[coeff_index] = 0
energy.append(self.energy(samples))
print("intercom_wdwt: coeff_index={} energy={}".format(coeff_index, energy[subband]))
subband += 1
min_energy = min(energy)
print("intercom_mdwt: min_energy={}".format(min_energy))
self.gain = []
subband = 0
for i in energy:
self.gain.append(energy[subband] / min_energy)
print("intercom_mdwt: gain[{}]={}".format(subband, self.gain[subband]))
subband += 1
def record_send_and_play_stereo(self, indata, outdata, frames, time, status):
indata[:,0] -= indata[:,1]
self.send(indata)
#We get the chunk from the coefficients buffer
chunk = self.buffer_coeffs[self.played_chunk_number % self.cells_in_buffer]
#Once we get the chunk, we reset the buffer
self.buffer_coeffs[self.played_chunk_number % self.cells_in_buffer] = np.zeros((self.frames_per_chunk, 2), dtype=np.int32)
#We divide the data by the factor to restore it
chunk = np.divide(chunk, factor)
#For each channel, we make the inverse discrete wavelet transform of the indata
for i in range(self.number_of_channels):
coeffs_from_arr = pywt.array_to_coeffs(chunk[:,i], self.coeff_slices, output_format="wavedec")
sample = pywt.waverec(coeffs_from_arr, wavelet=wavelet, mode=padding)
chunk[:,i] = sample
#We parse the chunk to int16 to play the data
chunk = chunk.astype(np.int16)
signs = chunk >> 15
magnitudes = chunk & 0x7FFF
#chunk = ((~signs & magnitudes) | ((-magnitudes) & signs))
chunk = magnitudes + magnitudes*signs*2
self._buffer[self.played_chunk_number % self.cells_in_buffer] = chunk
self._buffer[self.played_chunk_number % self.cells_in_buffer][:,0] += self._buffer[self.played_chunk_number % self.cells_in_buffer][:,1]
self.play(outdata)
self.received_bitplanes_per_chunk [self.played_chunk_number % self.cells_in_buffer] = 0
def dwt(self):
#imLists = [IMAGEPATH + "a01_1.tif", IMAGEPATH + "a01_2.tif"]
start = time.time()
self.show_Image_DWt(self.image1)
self.show_Image_DWt(self.image2)
# show_DWt1D()
coeffs = self.calculate_coeffs(self.image1)
arr, coeff_slices = pywt.coeffs_to_array(coeffs)
#show_DWt1D(coeffs)
# show_Image_DWt(coeffs,target)
#self.show_DWt1D()
coeffs2 = self.calculate_coeffs(self.image2)
arr2, coeff_slices2 = pywt.coeffs_to_array(coeffs2)
startPCA = time.time()
# p=PCA()
#array = p.PCA(arr, arr2)#FusionMethod
f = Fusion(arr, arr2)
array = f.PCA()
endPCA = time.time()
print('Gesamtzeit PCA: {:5.3f}s'.format(endPCA - startPCA))
coeffs_from_arr = pywt.array_to_coeffs(array,
coeff_slices,
output_format='wavedecn')
#self.show_DWt1D()
self.target = pywt.waverecn(coeffs_from_arr, wavelet='db1')
self.plot()
end = time.time()
print('Gesamtzeit DWT: {:5.3f}s'.format((end - start) -
(endPCA - startPCA)))
print('Gesamtzeit DWT and PCA: {:5.3f}s'.format(end - start))
return self.target
def _transform(self, m, wv = 'db4'):
msyn = np.zeros(mesh.nC)
coeff_map = pywt.wavedecn(msyn.reshape(self.mesh.nCx,self.mesh.nCy,order = 'F'),wv, mode = 'per')
array_map = pywt.coeffs_to_array(coeff_map)
coeff_map = pywt.array_to_coeffs(m.reshape(array_map[0].shape,order= 'F'),array_map[1])
coeff_back_map = pywt.waverecn(coeff_map,wv, mode = 'per')
return Utils.mkvc(coeff_back_map)
def record_send_and_play_stereo(self, indata, outdata, frames, time,
status):
indata[:, 0] -= indata[:, 1]
self.send(indata)
chunk = self.buffer_coeffs[self.played_chunk_number %
self.cells_in_buffer]
self.buffer_coeffs[self.played_chunk_number %
self.cells_in_buffer] = np.zeros(
(self.frames_per_chunk, 2), dtype=np.int32)
# Inversed wavelet for both channels
for i in range(self.number_of_channels):
coeffs_from_arr = pywt.array_to_coeffs(chunk[:, i],
self.coeff_slices,
output_format="wavedec")
sample = pywt.waverec(coeffs_from_arr, wavelet="db1", mode="per")
chunk[:, i] = sample
# We need to cast it as int16 to play
chunk = chunk.astype(np.int16)
# Same as dfc
signs = chunk >> 15
magnitudes = chunk & 0x7FFF
chunk = magnitudes + magnitudes * signs * 2
self._buffer[self.played_chunk_number % self.cells_in_buffer] = chunk
self._buffer[self.played_chunk_number %
self.cells_in_buffer][:, 0] += self._buffer[
self.played_chunk_number % self.cells_in_buffer][:, 1]
self.play(outdata)
self.received_bitplanes_per_chunk[self.played_chunk_number %
self.cells_in_buffer] = 0
def calc_wavelet_th(line, wavelet_name, count_process, max_process, sgm_n,
coef_m, smoothing):
len_line = len(line)
rep_line = line[::-1] + line[::] + line[::-1]
coeffs = pywt.wavedecn(rep_line, wavelet_name[count_process])
list_, sep_ = pywt.coeffs_to_array(coeffs)
m_max = int(np.log2(len(list_))) ### m(frequency) filter ###
for m in range(1, m_max + 1):
for n in range(2**(m_max - m), 2**(m_max - m) * 2):
if m > m_max * coef_m[count_process] and n != 0:
list_[n] = 0
lambda_ = np.sqrt(2.0 * np.log(
len(rep_line))) * sgm_n[count_process] ### n(location) filter ##
# plt.plot(np.arange(len(list_)),list_);plt.hlines(lambda_,xmin=0,xmax=len(list_));
list_ = [
x if (i < len(list_) * 0.01 or np.abs(x) > lambda_) else 0
for i, x in enumerate(list_)
]
# plt.plot(np.arange(len(list_)),list_);plt.hlines(-lambda_,xmin=0,xmax=len(list_));plt.show();
coeffs = pywt.array_to_coeffs(list_, sep_)
reline = pywt.waverecn(coeffs, wavelet_name[count_process])
# plt.plot(np.arange(len(reline)),reline);plt.plot(np.arange(len(rep_line)),rep_line);plt.show();
if count_process != max_process - 1:
res = calc_wavelet_th(list(reline[len_line:len_line * 2]),
wavelet_name, count_process + 1, max_process,
sgm_n, coef_m, smoothing)
else:
if smoothing:
res = calc_wavelet_smooth(list(reline[len_line:len_line * 2]),
'Haar', 3)
else:
res = list(reline[len_line:len_line * 2])
return res
def Daubechies_opt(M, par=2, lvl=1):
I = int(np.sum(def_matrix))
(nx, ny) = def_matrix.shape
wave = 'db' + str(par)
md = 'periodization'
Q = nn.Conv2d(1, I, kernel_size=nx, stride=1, padding=0)
Q.bias.data = torch.zeros(I)
ind = np.nonzero(def_matrix)
Z = np.zeros((nx, ny))
for index in range(I):
i = ind[0][index]
j = ind[1][index]
Z[i, j] = 1
pat_coefs = pywt.wavedec2(Z, wave, mode=md, level=lvl)
[temp, arr] = pywt.coeffs_to_array(pat_coefs)
pat_temp = pywt.array_to_coeffs(Z, arr, output_format='wavedec2')
pat = pywt.waverec2(pat_temp, wave)
pat = torch.from_numpy(pat)
Z[i, j] = 0
Q.weight.data[index, 0, :, :] = pat
Q.bias.requires_grad = False
Q.weight.requires_grad = False
return Q
def test_wavedecn_coeff_reshape_axes_subset():
# verify round trip is correct when only a subset of axes are transformed:
# wavedecn - >coeffs_to_array-> array_to_coeffs -> waverecn
# This is done for wavedec{1, 2, n}
rng = np.random.RandomState(1234)
mode = 'symmetric'
w = pywt.Wavelet('db2')
N = 16
ndim = 3
for axes in [(-1, ), (0, ), (1, ), (0, 1), (1, 2), (0, 2), None]:
x1 = rng.randn(*([N] * ndim))
coeffs = pywt.wavedecn(x1, w, mode=mode, axes=axes)
coeff_arr, coeff_slices = pywt.coeffs_to_array(coeffs, axes=axes)
if axes is not None:
# if axes is not None, it must be provided to coeffs_to_array
assert_raises(ValueError, pywt.coeffs_to_array, coeffs)
# mismatched axes size
assert_raises(ValueError,
pywt.coeffs_to_array,
coeffs,
axes=(0, 1, 2, 3))
assert_raises(ValueError, pywt.coeffs_to_array, coeffs, axes=())
coeffs2 = pywt.array_to_coeffs(coeff_arr, coeff_slices)
x1r = pywt.waverecn(coeffs2, w, mode=mode, axes=axes)
assert_allclose(x1, x1r, rtol=1e-4, atol=1e-4)
def record_send_and_play_stereo(self, indata, outdata, frames, time,
status):
#Binaural calculation L=L-R
indata[:, 0] -= indata[:, 1]
#send indata
self.send(indata)
#start recovering samples out of coefficient arrays
for ch in range(self.number_of_channels):
#Get received coefficient array from buffer for channel X
arr_chan = self._buffer_coeffs[self.played_chunk_number %
self.cells_in_buffer][:, ch]
#Inverse precision calculation
arr_chan = np.divide(arr_chan, factor_precision)
#Get coefficientes from array with help of saved slice structure
coeffs_chan = wt.array_to_coeffs(arr_chan,
self.slice_structure,
output_format="wavedec")
#Get samples with help of inverse DWT transform
recover = wt.waverec(coeffs_chan, wavelet=wavelet, mode=padding)
#Check if overlappinf is active
if (overlap > 0):
#Delete first and last overlapping samples
self._buffer[self.played_chunk_number %
self.cells_in_buffer][:, ch] = (recover.astype(
np.int16))[+(overlap // 2):-(overlap // 2)]
else:
self._buffer[self.played_chunk_number %
self.cells_in_buffer][:, ch] = (recover.astype(
np.int16))
#Clean coefficient buffer position
self._buffer_coeffs[self.played_chunk_number %
self.cells_in_buffer] = self.generate_zero_arr()
#Inverse sign magnitude calculation
chunk = self._buffer[self.played_chunk_number % self.cells_in_buffer]
signs = chunk >> 15
magnitudes = chunk & 0x7FFF
chunk = magnitudes + magnitudes * signs * 2
#Write chunk with correct sign and magnitude to play-buffer
self._buffer[self.played_chunk_number % self.cells_in_buffer] = chunk
#Inverse binaural calculation L=L+R
self._buffer[self.played_chunk_number %
self.cells_in_buffer][:, 0] += self._buffer[
self.played_chunk_number % self.cells_in_buffer][:, 1]
#Play data
self.play(outdata)
self._buffer[self.played_chunk_number %
self.cells_in_buffer] = self.generate_zero_chunk()
self.received_bitplanes_per_chunk[self.played_chunk_number %
self.cells_in_buffer] = 0
def recon(self,z1):
"""
Wavelet reconstruction: coefficients -> image
"""
coeffs = pywt.array_to_coeffs(z1, self.coeff_slices, \
output_format='wavedec2')
z0 = pywt.waverec2(coeffs, wavelet=self.wavelet, mode=self.mode)
return z0
def WT(self, wav_x):
"""
Computes the adjoint Wavelet transform from a vectorized image.
"""
wav_x = np.reshape(wav_x, (self.m, self.m))
x = self.WT_operator(
pywt.array_to_coeffs(wav_x, self.coeffs, output_format='wavedec2'))
return np.reshape(x, (self.N, 1))
def iDWT(s0, wave, levels, coeff_slices=None, mode='zero'):
"""
returns full scale iDWT of s0 with multiple levels
"""
sz = s0.shape[0]
if coeff_slices is None:
coeff_slices = default_slices(levels, sz)
c = pywt.array_to_coeffs(s0, coeff_slices, output_format='wavedec2')
return pywt.waverec2(c, 'db4', mode='periodization')
def iDWT(self, coeffs_in_array):
#return coeffs_in_array
coeffs_in_subbands = wt.array_to_coeffs(coeffs_in_array,
self.slices,
output_format="wavedec")
return np.around(
wt.waverec(coeffs_in_subbands,
wavelet=self.wavelet,
mode=self.padding)).astype(self.sample_type)
def _rmatvec(self, x):
x = np.reshape(x, self.dimsd)
x = pywt.array_to_coeffs(x, self.sl, output_format="wavedec2")
y = pywt.waverec2(x,
wavelet=self.waveletadj,
mode="periodization",
axes=self.dirs)
y = self.pad.rmatvec(y.ravel())
return y
def deriv(self, m, v=None, wv = 'db4'):
if v is not None:
coeff_wv = pywt.wavedecn(v.reshape(self.mesh.nCx,self.mesh.nCy,order = 'F'),wv, mode = 'per')
array_wv = pywt.coeffs_to_array(coeff_wv)
coeff_back = pywt.array_to_coeffs(v,array_wv[1])
coeff_m = pywt.waverecn(coeff_back,wv, mode = 'per')
return Utils.mkvc(coeff_m)
else:
print "not implemented"
def inverse_wavelet_transform(w_coeffs_rgb, coeff_slices, x_shape):
x_hat = np.zeros(x_shape)
for i in range(w_coeffs_rgb.shape[0]):
w_coeffs_list = pywt.array_to_coeffs(w_coeffs_rgb[i, :, :],
coeff_slices)
x_hat[0, :, :, i] = pywt.waverecn(w_coeffs_list,
wavelet='db4',
mode='periodization')
return x_hat
def unpack(self, packed_chunk, dtype=minimal.Minimal.SAMPLE_TYPE):
chunk_number, chunk = super().unpack(packed_chunk, dtype)
decomposition_left = pywt.array_to_coeffs(chunk[:, 0],
self.slices,
output_format="wavedec")
decomposition_right = pywt.array_to_coeffs(chunk[:, 1],
self.slices,
output_format="wavedec")
reconstructed_chunk_left = pywt.waverec(decomposition_left,
wavelet=self.wavelet,
mode="per")
reconstructed_chunk_right = pywt.waverec(decomposition_right,
wavelet=self.wavelet,
mode="per")
reconstructed_chunk = np.empty((minimal.args.frames_per_chunk, 2),
dtype=dtype)
reconstructed_chunk[:, 0] = reconstructed_chunk_left[:]
reconstructed_chunk[:, 1] = reconstructed_chunk_right[:]
return chunk_number, reconstructed_chunk
def _rmatvec(self, x):
if self.reshape:
x = np.reshape(x, self.dimsd)
x = pywt.array_to_coeffs(x, self.sl, output_format='wavedecn')
y = pywt.waverecn(x,
wavelet=self.waveletadj,
mode='periodization',
axes=(self.dir, ))
y = self.pad.rmatvec(y.ravel())
return y
def get_coef(self, wanted_scale):
data = self.CoefMatrix
mat = np.array([])
for i in np.arange(self.ntrials):
C = pywt.array_to_coeffs(data[i, :],
self.slices,
output_format='wavedec')
temp = np.hstack([C[i] for i in wanted_scale])
mat = np.hstack((mat, temp))
return np.reshape(mat, (self.ntrials, -1))
def get_image_array_from_coeffs(img_coeffs_array, img_coeffs_slices, wavelet): # Input: image_coefficient array, the image coefficient slices and the wavelet type # Output: reconstructed image array temp_layers = [] for i in range(3): temp_tuple = pywt.array_to_coeffs(img_coeffs_array[i], img_coeffs_slices[i], output_format="wavedec2") temp_layers.append(pywt.waverec2(temp_tuple, wavelet)) image_array = np.stack(temp_layers, axis=0) return image_array
def DWT_synthesize(self, coefs, slices, wavelet_name="db10"):
"""
Returns the original array from a numpy array that contains the
wavelet coefficients.
"""
wavelet = pywt.Wavelet(wavelet_name)
samples = np.empty(coefs.shape, dtype=np.int32)
decomposition_0 = pywt.array_to_coeffs(coefs[:, 0],
slices,
output_format="wavedec")
decomposition_1 = pywt.array_to_coeffs(coefs[:, 1],
slices,
output_format="wavedec")
samples[:, 0] = np.rint(
pywt.waverec(decomposition_0, wavelet=wavelet,
mode="per")).astype(np.int32)
samples[:, 1] = np.rint(
pywt.waverec(decomposition_1, wavelet=wavelet,
mode="per")).astype(np.int32)
return samples
def test_waverec_invalid_inputs():
# input must be list or tuple
assert_raises(ValueError, pywt.waverec, np.ones(8), 'haar')
# input list cannot be empty
assert_raises(ValueError, pywt.waverec, [], 'haar')
# 'array_to_coeffs must specify 'output_format' to perform waverec
x = [3, 7, 1, 1, -2, 5, 4, 6]
coeffs = pywt.wavedec(x, 'db1')
arr, coeff_slices = pywt.coeffs_to_array(coeffs)
coeffs_from_arr = pywt.array_to_coeffs(arr, coeff_slices)
message = "Wrong coefficient format, if using 'array_to_coeffs' please specify the 'output_format' parameter"
assert_raises_regex(AttributeError, message, pywt.waverec, coeffs_from_arr, 'haar')
def PrintReconstructions(coeffs, n):
arr, coeff_slices = pywt.coeffs_to_array(coeffs)
#Removing Details
for i in range(n,len(coeff_slices)):
arr[coeff_slices[i]['ad']] = 0
arr[coeff_slices[i]['dd']] = 0
arr[coeff_slices[i]['da']] = 0
D1 = pywt.array_to_coeffs(arr, coeff_slices)
dCat = pywt.waverecn(D1, wavelet)
plt.figure()
plt.title('Reconstructed with level %i of details' %(n-1))
plt.imshow(dCat,cmap=colormap)
return
def test_waverecn_coeff_reshape_odd():
# verify round trip is correct:
# wavedecn - >coeffs_to_array-> array_to_coeffs -> waverecn
rng = np.random.RandomState(1234)
x1 = rng.randn(35, 33)
for mode in pywt.Modes.modes:
for wave in ['haar', ]:
w = pywt.Wavelet(wave)
maxlevel = pywt.dwt_max_level(np.min(x1.shape), w.dec_len)
if maxlevel == 0:
continue
coeffs = pywt.wavedecn(x1, w, mode=mode)
coeff_arr, coeff_slices = pywt.coeffs_to_array(coeffs)
coeffs2 = pywt.array_to_coeffs(coeff_arr, coeff_slices)
x1r = pywt.waverecn(coeffs2, w, mode=mode)
# truncate reconstructed values to original shape
x1r = x1r[[slice(s) for s in x1.shape]]
assert_allclose(x1, x1r, rtol=1e-4, atol=1e-4)
def hfilter(diff_image, var_image, threshold=1, ndamp=10):
"""
This code was inspired from: https://github.com/spacetelescope/sprint_notebooks/blob/master/lucy_damped_haar.ipynb
I believe it was initially written by Justin Ely: https://github.com/justincely
It was buggy and not working properly with every image sizes.
I have thus exchanged it by using pyWavelet (pywt) and a custom function htrans
to calculate the matrix for the var_image.
"""
him, coeff_slices = pywt.coeffs_to_array(pywt.wavedec2(diff_image.astype(np.float), 'haar'), padding=0)
dvarim = htrans(var_image.astype(np.float))
sqhim = ((him/threshold)**2)/dvarim
index = np.where(sqhim < 1)
if len(index[0]) == 0:
return diff_image
# Eq. 8 of White is derived leading to N*x^(N-1)-(N-1)*x^N :DOI: 10.1117/12.176819
sqhim = sqhim[index] * (ndamp * sqhim[index]**(ndamp-1) - (ndamp-1)*sqhim[index]**ndamp)
him[index] = sign(threshold*np.sqrt(dvarim[index] * sqhim), him[index])
return pywt.waverec2(pywt.array_to_coeffs(him, coeff_slices, output_format='wavedec2'), 'haar')[:diff_image.shape[0],:diff_image.shape[1]]
def inverse_wavelet_transform(w_coeffs_rgb, coeff_slices, x_shape):
x_hat = np.zeros(x_shape)
for i in range(w_coeffs_rgb.shape[0]):
w_coeffs_list = pywt.array_to_coeffs(w_coeffs_rgb[i,:,:], coeff_slices)
x_hat[0,:,:,i] = pywt.waverecn(w_coeffs_list, wavelet='db4', mode='periodization')
return x_hat