由于大多数自然图像都有低通特性，因而该滤波器大多数时间运作于标量模式。
Since most natural images have a lowpass property, the proposed approach operates on the scalar mode most of the time.
low模式只填充表的标量统计值(也就是说，没有分布信息)。
The low mode populates only the scalar statistical values (that is, no distribution information) of a table.
low模式只填充表的标量统计值(也就是说，没有分布信息)。
The low mode populates only the scalar statistical values (that is, no distribution information) of a table.
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