Secondly，cascading two one-dimensional LP-NPR filter banks in the form of tree structure and using the unimodular transformation，a two dimensional nonseparable LP-NPR filter banks can be obtained. 然后利用树状结构来结合两个一维LP-NPR滤波器组，并运用单位模变换，可以得到二维不可分离LP-NPR滤波器组。
REDUCTION RECOGNITION AND UNIMODULAR TRANSFORMATION 归约识别及其单模变换
The basis matrix B is unimodular 基矩阵B是幺模的。
The Classification of Positive Definite Unimodular Lattices Over 上正定幺模格的分类
Increase Parallel Granularity and Data Locality by Unimodular Metrics 利用U模变换增加并行粒度与改善数据访问局部性的方法
