摘要
本文考虑了小波形成一对Hilbert变换的一对小波基的设计。该推导是基于无限乘积公式定义的极限函数。结果发现,尺度滤波器应该相互抵消(偏移)一个半采样。这给出了Kingsbury结果的替代推导和解释,即当尺度滤波器满足相同的偏移时,双树复小波变换是几乎平移不变的。
This paper considers the design of pairs of wavelet bases where the wavelets form a Hilbert transform pair. The derivation is based on the limit functions defined by the infinite product formula. It is found that the scaling filters should be offset from one another by a half sample. This gives an alternative derivation and explanation for the result by Kingsbury,that the dual-tree wavelet transform is nearly shift-invariant when the scaling filters satisfy the same offset.
引文
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