A Wavelet Tour of Signal Processing, Second Edition (Wavelet by Stephane Mallat PDF

By Stephane Mallat

ISBN-10: 0080520839

ISBN-13: 9780080520834

ISBN-10: 012466606X

ISBN-13: 9780124666061

This publication is meant to function a useful reference for a person excited by the applying of wavelets to sign processing. It has advanced from fabric used to coach "wavelet sign processing" classes in electric engineering departments at Massachusetts Institute of expertise and Tel Aviv college, in addition to utilized arithmetic departments on the Courant Institute of recent York collage and ?‰colePolytechnique in Paris. Key positive factors* offers a vast viewpoint at the rules and purposes of temporary sign processing with wavelets* Emphasizes intuitive realizing, whereas offering the mathematical foundations and outline of speedy algorithms* a variety of examples of genuine functions to noise removing, deconvolution, audio and picture compression, singularity and facet detection,multifractal research, and time-varying frequency measurements* Algorithms and numerical examples are carried out in Wavelab, that is a Matlab toolbox freely to be had over the net* content material is offered on numerous point of complexity, reckoning on the person reader's needsNew to the second one version* Optical circulation calculation and video compression algorithms* photograph types with bounded version features* Bayes and Minimax theories for sign estimation* two hundred pages rewritten and such a lot illustrations redrawn* extra difficulties and themes for a graduate direction in wavelet sign processing, in engineering and utilized arithmetic

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Extra resources for A Wavelet Tour of Signal Processing, Second Edition (Wavelet Analysis & Its Applications)

Example text

In general, bounded variation images must have step edges of finite length. Discrete Images A camera measures light intensity with photoreceptors that perform a uniform sampling over a grid that is supposed to be uniform. For a resolution N, the sampling interval is N -1 and the resulting image can be written fN[nl,n2]- f(nl/N, n2/N). 66) we say that the image has bounded variation if IIfNllv is bounded by a constant independent of the resolution N.

2. 6 CHAPTER I INTRODUCTION TO A TRANSIENT WORLD ,S~(co) I q .......... ~o3 S ::Gt q _ SO ~' Vu~s~ Vu0,s )l VuV S~ t t ............. 2 Time-frequency boxes of two wavelets Cu,s and ~u0,s0. When the scale s decreases, the time support is reduced but the frequency spread increases and covers an interval that is shifted towards high frequencies. Multiscale Zooming The wavelet transform can also detect and characterize transients with a zooming procedure across scales. Suppose that ~ is real. Since it has a zero average, a wavelet coefficient Wf (u, s) measures the variation of f in a neighborhood of u whose size is proportional to s.

2 Estimation The estimation of a signal embedded in noise requires taking advantage of any prior information about the signal and the noise. Chapter 10 studies and contrasts several approaches: Bayes versus minimax, linear versus non-linear. Until recently, signal processing estimation was mostly Bayesian and linear. Non-linear smoothing algorithms existed in statistics, but these procedures were often ad-hoc and complex. Two statisticians, Donoho and Johnstone [ 167], changed the game by proving that a simple thresholding algorithm in an appropriate basis can be a nearly optimal non-linear estimator.

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A Wavelet Tour of Signal Processing, Second Edition (Wavelet Analysis & Its Applications) by Stephane Mallat


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