Low level image processing is the base of localization. The paper discusses time domain filtering and frequency domain filtering according to the noise disturbance in the surrounding images.
低层视觉图象处理是视觉定位的基础，针对环境图象存在噪声干扰的特点，文章分别从时域和频域上分析了图象滤波的方法。
Power System forced power oscillation is a kind of low frequency oscillation caused by persistent periodic small disturbance.
电力系统强迫功率振荡为持续的周期性小扰动所引起低频振荡现象。
The characters of this method are high precision, strong anti disturbance capability, less requirements to hardware, especially suitable to low frequency measurement, etc.
本方法具有精度高、抗干扰能力强、硬件少、适用于低频测量等特点。
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