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Gain normalization of lifted filter banks

机译:提升滤光片组的归一化

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摘要

The DC and Nyquist responses of the filters in a two-channel perfect reconstruction filter bank are expressed in terms of the lifting filters in a lifting decomposition. The computation makes use of the cascade-form representation of lifting steps as lower- and upper-triangular factor matrices in the polyphase-with-advance representation. A functional relationship is derived connecting the DC and Nyquist responses via the polyphase determinant, and it is shown that the responses for a lifted filter bank can be computed recursively using the DC responses of the lifting filters. These results are applied to derive the filter bank normalization specifications in Part 2 of the ISO/IEC JPEG 2000 still image coding standard.
机译:两通道完美重构滤波器组中滤波器的DC和Nyquist响应以提升分解中的提升滤波器表示。该计算利用提升步骤的级联形式表示作为多相提前表示中的上下三角因子矩阵。通过多相行列式导出了一个函数关系,将直流响应和奈奎斯特响应连接起来,结果表明,可以使用提升滤波器的直流响应来递归计算提升滤波器组的响应。这些结果可用于导出ISO / IEC JPEG 2000静态图像编码标准的第2部分中的滤波器组归一化规范。

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