multi level 1-D wavelet decomposition

Question

Majid Al-Sirafi 2012-7-11

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https://ww2.mathworks.cn/matlabcentral/answers/43271-multi-level-1-d-wavelet-decomposition

评论： Muhammad Shahid Jabbar 2020-6-20

Hi every one

I applied the Multilevel 1-D wavelet decomposition for vector array, by the following syntax:

[C,L] = wavedec(s,3,'haar')

where s is vector and 3 is level-3 and harr is 'haar' filter , I want to know which is the Low frequency and High frequency coefficients after transformation operation thank you

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Answer 1

Minh 2012-7-11

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https://ww2.mathworks.cn/matlabcentral/answers/43271-multi-level-1-d-wavelet-decomposition#answer_53167

Please try the following MATLAB command

>>doc wavedec

Then do the example in the help documentation, hopefully you will work out which coefficients are for low frequency coefficients and which are for high frequency coefficients. Please note that approximation coefficients correspond to low frequency coefficients and detail coefficients correspond to high frequency coefficients.

cheers,

Minh