MATLAB: Wavelet correspond to the scale

wavelet correspond to a scale

Hi guys I want to perform a continuous wavelet transform and find the maximum coefficient. how can i find the wavelet correspond to that coefficient.i want the actual wavelet so i can Subtract it from my original signal

Best Answer

If you want to reconstruct an approximation to your signal without the influence of a particular scale, then use cwtft and icwtft.

The way you seem to be suggesting won't work. The CWT coefficient at any point is affected by more than one wavelet because of the reproducing kernel -- it's not like the critically sampled DWT.

You can use a delta function as an input and see this clearly.

See here:

CWT

Related Solutions

MATLAB: Wavelet

Hi Jaffino, the term "octave" as applied to the DWT is just referring to the dyadic scales. So you take all the coefficients at that scale. For example:

x = randn(1024,1);
[C,L] = wavedec(x,3,'db4');
d3 = detcoef(C,L,3);

d3 is the vector of coefficients at scale 3 (3rd octave). I think octave is a bit outdated now in the wavelet literature, better to refer to them as just scales.

MATLAB: Wavelets

Hi Aavula, dwt2 gives you the 2D (separable) discrete wavelet transform at one level.

wavedec2 gives you the 2D (separable) discrete wavelet transform at a number of levels if you wish (provided as an input argument). wavedec2 uses dwt2 to iterate on the LL component.

Hope that helps,

Wayne

Best Answer

Related Solutions

MATLAB: Wavelet

MATLAB: Wavelets

Related Question