设计了空间域和频率域加密算法。
Encryption algorithms in spatial domain and frequency domain are proposed.
频率域、全息及有关的概念都已采用。
The frequency domain, the holograph and related concepts have all been used.
通常，图像的边缘为频率域的高频分量。
Usually, the edge of image is the high frequency of frequency field.
因此，在频率域滤波的方法越来越引起关注。
So, the filters in frequency domain have attracted more and more attention.
本文给出了在频率域内计算这三种系数的新方法。
In this paper, a new method for calculating the three kinds of coefficients in the frequency domain is introduced.
结果表明，在频率域上有丰富的地热地震前兆信息；
The result shows that ther is abundant information of seismo-geothermal precursors in the frequency domain.
然后求解这个加权矩阵方程，得到频率域的稀疏解。
Then the sparse solution in frequency domain can be obtained through computing the weighted matrix equation.
目前在频率域电磁法中常常采用远区视电阻率定义。
At present, the far-zone apparent resistivity definition is usually used in the frequency domain electromagnetic methods.
目的频率域上研究生命信号在分层媒质中的传输特性。
AIM To study the propagation characteristic of vital signals in layered media.
研究表明通过频率域分析可以得到有关人体响应的重要信息。
It is shown that important information about human response can be obtained from a frequency domain analysis.
研究了频率域电磁测深中水平电偶源漏电对观测数据的影响。
The influence of current leakage from horizontal electric dipole on frequency electromagnetic sounding data was studied in this paper.
本文从频率域分析了陕西近年来记到的约十个地磁湾扰和磁扰。
In this paper, we have analysed, in the frequency domain, ten bay disturbances and magnetic disturbances in Shaanxi in recent years.
可完成数据的采集、转换，并进行时间域和频率域的多种运算。
The system is capable of sampling, conversion and various calculations in both time and frequency domains.
采用连分式近似，可以得到空间频率域的有限差分深度偏移方程。
The finite difference depth migration equation in space-frequency domain can be derived when the radical expression is approximated by continued fraction.
直升机频率域电磁系统在磁性地区的视电阻率填图，长期存在争议。
The apparent resistivity mapping of the helicopter frequency domain em system in magnetic area has been a problem of long controversy.
通过对计算结果的分析，在理论上说明了线源频率域近区测深的可行性。
It shows in theory that the frequency domain sounding in near zone of the line current source is possible.
在频率域内，低噪声定位装置和相位平均技术可以提供振幅和假频谐振。
Low noise fixture and phase average technique provide the amplitude and spurious resonance in frequency domain.
把时间域信息和频率域信息联系起来进行分析的方法，称为时频分析法。
The method that relates temporal information to spectral information is called temporal frequency analysis.
直升机频率域电磁系统的最大勘探深度究竟是多少，一直是有争议的问题。
The maximum prospecting depth of the helicopter frequency domain EM system has been a problem of long controversy.
采用有限元直接迭代算法实现了线源频率域测深电磁响应的二维正演计算。
The Direct Iterative Finite Element algorithm (DIFE) is used to calculate the electromagnetic responses at earth surface excited by a line current source.
本文对频率域无限长线源近区（过渡区）测深的理论基础进行了探索性研究。
The preliminary research result of electromagnetic prospecting with the near field(transition region) of infinite-length line source in frequency domain is presented in this paper.
薄层反射在频率域会出现陷频现象，其陷频周期的倒数等于薄层的时间厚度。
The reflection of thin layer may lead to frequency notch and the reciprocal of notch cycle is equal to the time thickness of thin layer.
本文对原方法的主要改进点是把相位移法与频率域二维滤波结合在一起进行运算。
Improvement to the old method formulated in this paper mainly lies in the combination of phase displacement method with frequency two-dimensional filtering in making operation.
多聚焦图像融合的算法较多，主要由基于空间域和基于频率域的图像融合法组成。
There are many multi-focus image fusion algorithms, mainly consisted of the spatial area based and the frequency area based algorithms.
研究结果显示，在频率域内，面波衰减系数分布与群速度分布具有一定的相关性。
The correlation property between the distribution of attenuation factor and that of the group velocity is indicated, in this study.
目的以门诊量资料为例，计算功率谱密度函数，研究时间序列信号的频率域特征。
Objective The power spectral density functions of outpatient flow are calculated in order to study the spectral characteristics of the given time series.
时频分析方法是利用小波变换原理，从地震波的时间域和频率域同时对其作出分析。
Time frequency analysis method is used to analyze the time domain and frequency domain of seismic waves at the same time according to the principle of wavelet transformation.
这种域间转换的概念在很多领域的学习中都很有用—例如，信号处理领域中从时间域移入频率域。
This notion of inter-domain transformation is useful in many fields of study-for example, moving from the time domain into the frequency domain in the field of signal processing.
这种域间转换的概念在很多领域的学习中都很有用—例如，信号处理领域中从时间域移入频率域。
This notion of inter-domain transformation is useful in many fields of study-for example, moving from the time domain into the frequency domain in the field of signal processing.
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