Wavelet multi-level ：Direct reconstruction with upcoef

[hengley]

Pywt.upcoef can implement a layer of decomposition and reconstruction of wavelets in Python, but after multi-layer decomposition, it is wrong to reconstruct data.

[TAUforPython]

try this

waveletname = 'db4'
dwt_coeffs = pywt.wavedec(signal, waveletname, level=5)

y_5level_idwt =
pywt.upcoef('a', dwt_coeffs[0][:], waveletname, level = 5, take = len(signal))\

• pywt.upcoef('d', dwt_coeffs[1][:], waveletname, level = 5, take = len(signal))\
• pywt.upcoef('d', dwt_coeffs[2][:], waveletname, level = 4, take = len(signal))\
• pywt.upcoef('d', dwt_coeffs[3][:], waveletname, level = 3, take = len(signal))\
• pywt.upcoef('d', dwt_coeffs[4][:], waveletname, level = 2, take = len(signal))\
• pywt.upcoef('d', dwt_coeffs[5][:], waveletname, level = 1, take = len(signal))
  plt.plot(t,y_5level_idwt)