Why does MATLAB's dualtree3 function not return the lowpass subband of the imaginary tree?

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ashkan abbasi
ashkan abbasi on 14 Sep 2020
Edited: ashkan abbasi on 14 Sep 2020
MATLAB has a function named dualtree3 which computes 3-D dual-tree complex wavelet transform. This function only retains the last low-pass coefficients/subband of the real tree. And, it does not save the low-pass subband of the imaginary tree. How can you justify this?
Previously, I have also asked this question here.

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