In low frequency sub band, the watermarking is embedded into host by the way of pixel-to-pixel embedding according to HVS model.

在低频分量部分，基于HVS视觉模型，将水印信号逐点变化地嵌入到原始图像中；

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The switching function model may be divided into two models of high frequency and low frequency. Then the average model for condition space of the rectifier is developed.

通过对开关函数求傅里叶级数，将开关函数模型分解为高频和低频两个模型，从而求得整流器的状态空间平均模型。

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During the radiometric calibration of the low frequency UWB SAR system, the scattering model of the calibrators should be regarded as the low frequency resonance scattering.

低频超宽带合成孔径雷达辐射定标过程中，定标体的散射特性表现为低频谐振散射特性。

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