混叠效应 Aliasing Distortion Effect
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用有灰度的象素值去平滑锯齿形边缘的出现，以减小混叠效应的可见性的处理技术。
The process of reducing the visibility of aliasing by using gray scale pixel values to smooth the appearance of jagged edges.
HHT刚提出不久，其理论本身还存在不少问题，如包络线和均值曲线的拟合、边界效应和模态混叠等问题。
HHT has not been put forward for long time, so it contains some theoretical problems, such as envelop and mean curve fit, boundary effect, modes mix and so on.
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