Python Image Processing (17): pyWavelet, pythonpywavelet

Python Image Processing (17): pyWavelet, pythonpywavelet

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Http://blog.csdn.net/lights_joy/

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Next, I will try python to complete wavelet-related operations. This process can be completed through the pyWavelet library.

Main features of pyWavelet:

-1D, 2D Positive and Negative discrete wavelet transform (DWT, IDWT)

-1D, 2d steady-state wavelet Transform (SWT, StationaryWavelet Transform)

-1D, 2D wavelet packet decomposition and reconstruction

-Approximate wavelet functions and scale functions

-Over 70 built-in wavelet filters support custom wavelet filters

-Single and Double Precision support

-Usage similar to Matlab Wavelet Toolbox

PyWavelet can be installed directly by using the pip command.

Write a simple script and try 1D DWT:

# -*- coding: utf-8 -*- import numpy as npimport pywtimport matplotlib.pyplot as plt# dwtx = np.linspace(-5,5,100)y = np.sin(x)(cA, cD) = pywt.dwt(y, 'db1')plt.subplot(311)plt.plot(y)plt.subplot(312)plt.plot(cA)plt.subplot(313)plt.plot(cD)plt.show()

Check the running result:

Everything works.

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