It is calculated as half of the value of the sampling rate.Passing this level causes aliasing distortion, or foldover.

它计算方法是将采样率除，过这个数值将会导致折叠失真，或称折叠。

Our approach is based on a gradient domain technique that preserves important local perceptual cues while avoiding traditional problems such as aliasing, ghosting and haloing.

我们方法是一种基于梯度域方法技术，保存了重部视觉暗示并避免了传统混淆现象，如鬼影和光晕问题。