The double-density DWT is an improvement upon the critically sampled DWT with important additional properties: It employs one scaling function and two distinct wavelets, which are designed to be offset from one another by one half, I wonder why double density DWT uses two HPF with offset 1/2 insteed of one HPF in DWT? what he mean with offset from one another by one half? how it impoved the lack of shift invariance?


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