How to read sub-bands of level 0 and level1 of wptree created using wpdec2?

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anu 2017-12-21

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https://ww2.mathworks.cn/matlabcentral/answers/374022-how-to-read-sub-bands-of-level-0-and-level1-of-wptree-created-using-wpdec2

I have applied wavdec2 two-dimensional wavelet packet analysis function to an image ([t,d] = wpdec2(X,3,'db1'); ). I want to calculate mean of sub-bands at each level. I am able to calculate mean of sub-bands at last level(i.e. level 2 terminal nodes). How to get sub-bands of level 0 and level l so that I can calcuate mean of sub-bands at level 0 and level 1.