rwt (version 1.0.0)

denoise: Wavelet-based Denoising

Description

Denoise the signal x using the 2-band wavelet system described by the filter h using either the traditional discrete wavelet transform (DWT) or the linear shift invariant discrete wavelet transform (also known as the undecimated DWT (UDWT)).

Usage

denoise(x, h, type, option)
denoise.dwt(x, h, option = default.dwt.option)
denoise.udwt(x, h, option = default.udwt.option)

Arguments

x

1D or 2D signal to be denoised

h

numeric scalar specifying scaling filter to be applied

type

type of transform. Valid values are: l{ DWT.TRANSFORM.TYPE UDWT.TRANSFORM.TYPE }

option

list containing desired transformation settings

Value

• Returns a list with components:
• xd
  estimate of noise free signal
• xn
  estimated noise signal (x-xd)
• option
  list of actual parameters used. It is configured the same way as the input option list with an additional element - option[[7]] = type.

Details

The transformation settings in the option list are:

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Examples

sig <- makesig(SIGNAL.DOPPLER)
h <- daubcqf(6)
ret.dwt <- denoise.dwt(sig$x, h$h.0)