可以省去

• Note that we achieve this goal at expense of numerous computation and frequent memory i / o . actually , it is not feasible to put so much workload on scaling which is only a subsection of whole transcoder . through polyphase decomposition of fir filter , we can avoid a mass of redundant computation and decrease memory i / o
  所以在基于软件的实现时，我们必须设计更加巧妙的滤波结构从而减少不必要的运算，通过对各种结构的对比和试验，发现基于fir的多相滤波器结构能够满足我们的要求，通过对fir滤波器的分解，我们可以省去大量的不必要计算和内存i o ,从而可以节约很多时间但保证图像质量毫无损失。