wavelet

Question

Dr G Jaffino 2011-10-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/19565-wavelet

回答： maryam mosaffa 2018-1-14

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Wayne King 2011-10-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/19565-wavelet#answer_25902

在 MATLAB Online 中打开

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 I think octave is a bit outdated now in the wavelet literature, better to refer to them as just scales.