1) ridge frequency
脊线频率
1.
Then,para-meters for the ridge frequency calculation are determined according to the fingerprint sensors.
基于G abor滤波器的低质指纹增强技术,对区域掩模及脊线频率的计算进行了改进。
2) local ridge frequency
局部脊线频率
1.
Then,the gray projection on the local orthogonal axis was used for estimating the local ridge frequency.
首先利用图像的局部灰度分布特点计算局部方向角;然后利用局部正交方向轴线上的灰度投影量估计局部脊线频率;最后利用自适应的具有方向选择和频率选择的Gabor滤波器对原图像进行滤波增强。
3) time-frequency backbone curve
时频脊线
1.
The FH signals with the short-time Fourier transform(STFT) is used to yield its time-frequency backbone curve,whose edge information is abstracted by the wavelet transform(WT),to which the FFT is applied — this is a known method to implement the hop rate accurate estimation when the SNR is high.
对跳频信号进行短时傅立叶变换,提取变换后的时频脊线,再利用小波变换提取该脊线的边沿信息,进而进行傅立叶变换,这是信噪比较高时已有的一种实现跳速精确估计的有效方法。
2.
They are used to yield accurate estimation for the hop frequencies and hop rate,which are fast 4th-order cyclic cumulants algorithm,time-frequency backbone curve analysis,and wavelet transform.
利用快速四阶循环累积量算法、时频脊线分析与小波变换相结合的方法,实现了跳频频率和码速率等参数的高精度估计。
4) Ridge curvature
脊线曲率
5) ridge frequency estimation
脊频率估计
6) frequency curve
频率曲线
1.
Research on optimality technology of frequency curve of step motor in control of PLC;
PLC控制的步进电机频率曲线优化技术研究
2.
Theoretical frequency curves and their application in engineering problems;
理论频率曲线及其在工程问题上的应用
3.
Based on the field data of the Weihe River from 1990 to 2000, the dynamic change of water quality was studied by use of the method of frequency curve.
为了解渭河陕西段主要污染因子的污染历时现状,对渭河陕西段的年径流量与水质污染程度的关系以及在不同水期水环境的质量进行了分析,利用1990~2000年系列水质监测料,采用频率曲线法分析研究了渭河陕西段水质的动态变化规律。
补充资料：频率计量(见时间频率计量)
频率计量(见时间频率计量)
frequency metrology: see time and frequency metrology
口n IQ liliang顷率频率计皿(f比quency metrolo盯) 计t。见时闰
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条