wavelet

For octave wavelet coefficients feature extraction take all the 8 wavelet coefficients or take only for 8th coefficient?

Answer 1

[Wayne King]

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 I think octave is a bit outdated now in the wavelet literature, better to refer to them as just scales.

Answer 2

[maryam mosaffa]

How can i know the best wavelet mother i chose for my case study.please introduce me the best way of choosing wavelet mother in CWT toolbox?