Other functions

Integrating wavelet functions

The result of the call depends on the wavelet argument:

  • for orthogonal and continuous wavelets - an integral of the wavelet function specified on an x-grid:

    [int_psi, x_grid] = integrate_wavelet(wavelet, precision)
    
  • for other wavelets - integrals of decomposition and reconstruction wavelet functions and a corresponding x-grid:

    [int_psi_d, int_psi_r, x_grid] = integrate_wavelet(wavelet, precision)
    

Central frequency of psi wavelet function

Quadrature Mirror Filter

Orthogonal Filter Banks

Example Datasets

The following example datasets are available in the module pywt.data:

name

description

ecg

ECG waveform (1024 samples)

aero

grayscale image (512x512)

ascent

grayscale image (512x512)

camera

grayscale image (512x512)

nino

sea surface temperature (264 samples)

demo_signal

various synthetic 1d test signals

Each can be loaded via a function of the same name.

Example:

>>> import pywt
>>> camera = pywt.data.camera()
>>> doppler = pywt.data.demo_signal('doppler', 1024)
>>> available_signals = pywt.data.demo_signal('list')